diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 92a91c3..4db7f7d 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,10 +13,10 @@ jobs:
         uses: actions/checkout@v2
       - name: Unshallow
         run: git fetch --prune --unshallow
-      - name: Set up Go
+      - name: Set up Go 1.18.x
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14.x
+          go-version: 1.18.x
       - name: Run GoReleaser
         uses: goreleaser/goreleaser-action@v1
         with:
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5a3475d..17a961f 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -12,10 +12,10 @@ jobs:
     steps:
     - name: Checkout code
       uses: actions/checkout@v2
-    - name: Set up Go 1.14
+    - name: Set up Go 1.18
       uses: actions/setup-go@v1
       with:
-        go-version: 1.14
+        go-version: 1.18
       id: go
     - name: Test
       run: go test -v ./...
diff --git a/.goreleaser.yml b/.goreleaser.yml
index b508573..39d8a14 100644
--- a/.goreleaser.yml
+++ b/.goreleaser.yml
@@ -4,7 +4,7 @@ builds:
     env:
     - CGO_ENABLED=0
     main: main.go
-    ldflags: '-s -w -X github.com/sensu-community/sensu-plugin-sdk/version.version={{.Version}} -X github.com/sensu-community/sensu-plugin-sdk/version.commit={{.Commit}} -X github.com/sensu-community/sensu-plugin-sdk/version.date={{.Date}}'
+    ldflags: '-s -w -X github.com/sensu/sensu-plugin-sdk/version.version={{.Version}} -X github.com/sensu/sensu-plugin-sdk/version.commit={{.Commit}} -X github.com/sensu/sensu-plugin-sdk/version.date={{.Date}}'
     # Set the binary output location to bin/ so archive will comply with Sensu Go Asset structure
     binary: bin/{{ .ProjectName }}
     goos:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 65cf513..433d6c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,10 +6,12 @@ and this project adheres to [Semantic
 Versioning](http://semver.org/spec/v2.0.0.html).
 
 ## Unreleased
+### Added
+- Implement magic scaling factor for large filesystems similar to original ruby plugin.
+
 ### Fixed
 - corrected armv7 asset build filter in .bonsai.yml. Thanks @DJM0.
 
-
 ## [0.7.0] - 2022-04-06
 
 ### Fixed
diff --git a/README.md b/README.md
index 130ade3..1d6a123 100644
--- a/README.md
+++ b/README.md
@@ -45,6 +45,9 @@ Flags:
   -p, --include-pseudo-fs         Include pseudo-filesystems (e.g. tmpfs) (default false)
   -r, --include-read-only         Include read-only filesystems (default false)
   -f, --fail-on-error             Fail and exit on errors getting file system usage (e.g. permission denied) (default false)
+  -m, --magic float               Magic factor to adjust warn/crit thresholds. Example: .9 (default 1)
+  -l, --minimum float             Minimum size to adjust (in GiB) (default 100)
+  -n, --normal float              Value in GiB. Levels are not adapted for filesystems of exactly this size, where levels are reduced for smaller filesystems and raised for larger filesystems. (default 20)
   -H, --human-readable            print sizes in powers of 1024 (default false)
       --metrics                   Output metrics instead of human readable output
       --tags strings              Comma separated list of additional metrics tags using key=value format.
@@ -81,6 +84,27 @@ continue to check the remaining file systems as expected.
 * The `--human-readable` (False by default) option determines if you prefer
 to display sizes of different drives in a human format. (Like df Unix/linux
 command.)
+* The `--magic`, `--normal`, and `--minimum` options work together to adjust 
+thresholds for larger filesystems. When a filesystem is larger than `--minimum` 
+the `--magic` scaling factor is used. For filesystems larger than `--normal` a magic scaling 
+factor less than 1 increases warning and critical thresholds. On filesystems
+smaller than `--normal`, a magic scaling factor less than 1 descreases thesholds.
+The idea being there's a bit more/less margin available for filesystems 
+larger/smaller relative to `--normal` based on similar data accomulation patterns, so the magic scaling factor lets you set a `normal` threshold and adjust the warning and critical thresholds up or down using a calculation.  The default `--magic` value, 1.0, will not adapt threshold percentages for volumes. 
+
+#### Magic Scaling Calculation
+
+```
+normalized_disk_size = disk_size_GiB/normal_size_GiB
+rescaled_disk_size = (normalized_disk_size)^magic_scale_factor
+scale = rescaled_disk_size / normalized_disk_size
+new_percent_threhold = 100.0 - ((100.0 - original_percent_threshold) * scale)
+```
+
+* For disks larger than `--normal` and `--magic` values less than 1, 
+result in `scale < 1` and `new_percent_threshold > original_percent_threshold`  
+* For disks smaller than `--normal`and `--magic` values less than 1 result in `scale > 1` 
+result in `scale > 1` and `new_percent_threshold < original_percent_threshold`  
 
 ## Configuration
 
diff --git a/go.mod b/go.mod
index eaf151a..74bb819 100644
--- a/go.mod
+++ b/go.mod
@@ -1,15 +1,56 @@
-module github.com/nixwiz/check-disk-usage
+module github.com/sensu/check-disk-usage
 
-go 1.14
+go 1.18
 
 require (
-	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
 	github.com/dustin/go-humanize v1.0.0
-	github.com/go-ole/go-ole v1.2.4 // indirect
-	github.com/sensu-community/sensu-plugin-sdk v0.11.0
-	github.com/sensu/sensu-go/api/core/v2 v2.3.0
-	github.com/sensu/sensu-go/types v0.3.0
+	github.com/sensu/sensu-go/api/core/v2 v2.14.0
+	github.com/sensu/sensu-plugin-sdk v0.16.0
 	github.com/shirou/gopsutil v3.20.11+incompatible
 	github.com/stretchr/testify v1.6.0
-	golang.org/x/sys v0.0.0-20201211090839-8ad439b19e0f // indirect
+)
+
+require (
+	github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d // indirect
+	github.com/blang/semver/v4 v4.0.0 // indirect
+	github.com/coreos/go-semver v0.3.0 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/echlebek/timeproxy v1.0.0 // indirect
+	github.com/fsnotify/fsnotify v1.4.7 // indirect
+	github.com/go-ole/go-ole v1.2.4 // indirect
+	github.com/gogo/protobuf v1.3.2 // indirect
+	github.com/golang-jwt/jwt/v4 v4.0.0 // indirect
+	github.com/golang/protobuf v1.5.2 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
+	github.com/google/uuid v1.1.2 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.0.0 // indirect
+	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
+	github.com/magiconair/properties v1.8.1 // indirect
+	github.com/mitchellh/mapstructure v1.1.2 // indirect
+	github.com/pelletier/go-toml v1.2.0 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/robertkrimen/otto v0.0.0-20191219234010-c382bd3c16ff // indirect
+	github.com/robfig/cron/v3 v3.0.1 // indirect
+	github.com/sensu/sensu-go/types v0.10.0 // indirect
+	github.com/sensu/sensu-licensing v0.1.2 // indirect
+	github.com/sirupsen/logrus v1.6.0 // indirect
+	github.com/spf13/afero v1.1.2 // indirect
+	github.com/spf13/cast v1.3.0 // indirect
+	github.com/spf13/cobra v1.4.0 // indirect
+	github.com/spf13/jwalterweatherman v1.0.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/viper v1.7.0 // indirect
+	github.com/subosito/gotenv v1.2.0 // indirect
+	go.etcd.io/etcd/api/v3 v3.5.0 // indirect
+	golang.org/x/net v0.0.0-20210525063256-abc453219eb5 // indirect
+	golang.org/x/sys v0.0.0-20210603081109-ebe580a85c40 // indirect
+	golang.org/x/text v0.3.6 // indirect
+	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c // indirect
+	google.golang.org/grpc v1.38.0 // indirect
+	google.golang.org/protobuf v1.26.0 // indirect
+	gopkg.in/ini.v1 v1.51.0 // indirect
+	gopkg.in/sourcemap.v1 v1.0.5 // indirect
+	gopkg.in/yaml.v2 v2.4.0 // indirect
+	gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c // indirect
 )
diff --git a/go.sum b/go.sum
index 0ad14cb..ea6e14e 100644
--- a/go.sum
+++ b/go.sum
@@ -19,32 +19,32 @@ github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d h1:G0m3OIz70MZUW
 github.com/StackExchange/wmi v0.0.0-20190523213315-cbe66965904d/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY=
 github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
 github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
 github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
 github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
 github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
+github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=
+github.com/blang/semver/v4 v4.0.0/go.mod h1:IbckMUScFkM3pff0VJDNKRiT6TG/YpiHIM2yvyW5YoQ=
+github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc=
+github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/etcd v3.3.17+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/etcd v3.3.22+incompatible h1:AnRMUyVdVvh1k7lHe61YEd227+CLoNogQuAypztGSK4=
-github.com/coreos/etcd v3.3.22+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-semver v0.3.0 h1:wkHLiw0WNATZnSG7epLsujiMCgPAc9xhjJ4tgnAxmfM=
 github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
-github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dgrijalva/jwt-go v3.2.0+incompatible h1:7qlOGliEKZXTDg6OTjfoBKDXWrumCAMpl/TFQ4/5kLM=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
 github.com/dustin/go-humanize v1.0.0 h1:VSnTsYCnlFHaM2/igO1h6X3HA71jcobQuxemgkq4zYo=
@@ -53,6 +53,11 @@ github.com/echlebek/crock v1.0.1 h1:KbzamClMIfVIkkjq/GTXf+N16KylYBpiaTitO3f1ujg=
 github.com/echlebek/crock v1.0.1/go.mod h1:/kvwHRX3ZXHj/kHWJkjXDmzzRow54EJuHtQ/PapL/HI=
 github.com/echlebek/timeproxy v1.0.0 h1:V41/v8tmmMDNMA2GrBPI45nlXb3F7+OY+nJz1BqKsCk=
 github.com/echlebek/timeproxy v1.0.0/go.mod h1:0dg2Lnb8no/jFwoMQKMTU6iAivgoMptGqSTprhnrRtk=
+github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
+github.com/envoyproxy/go-control-plane v0.9.4/go.mod h1:6rpuAdCZL397s3pYoYcLgu1mIlRU8Am5FuJP05cCM98=
+github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
+github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
 github.com/fatih/color v1.7.0/go.mod h1:Zm6kSWBoL9eyXnKyktHP6abPY2pDugNf5KwzbycvMj4=
 github.com/fsnotify/fsnotify v1.4.7 h1:IXs+QLmnXW2CcXuY+8Mzv/fWEsPGWxqefPtCP5CnV9I=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
@@ -66,9 +71,11 @@ github.com/go-ole/go-ole v1.2.4/go.mod h1:XCwSNxSkXRo4vlyPy93sltvi/qJq0jqQhjqQNI
 github.com/go-stack/stack v1.8.0/go.mod h1:v0f6uXyyMGvRgIKkXu+yp6POWl0qKG85gN/melR3HDY=
 github.com/gogo/protobuf v1.1.1/go.mod h1:r8qH/GZQm5c6nD/R0oafs1akxWv10x8SbQlK7atdtwQ=
 github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zVXpSg4=
-github.com/gogo/protobuf v1.3.1 h1:DqDEcV5aeaTmdFBePNpYsp3FlcVH/2ISVVM9Qf8PSls=
 github.com/gogo/protobuf v1.3.1/go.mod h1:SlYgWuQ5SjCEi6WLHjHCa1yvBfUnHcTbrrZtXPKa29o=
-github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b h1:VKtxabqXZkF25pY9ekfRL6a582T4P37/31XEstQ5p58=
+github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q=
+github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q=
+github.com/golang-jwt/jwt/v4 v4.0.0 h1:RAqyYixv1p7uEnocuy8P1nru5wprCh/MH2BIlW5z5/o=
+github.com/golang-jwt/jwt/v4 v4.0.0/go.mod h1:/xlHOz8bRuivTWchD4jCa+NbatV+wEUSzwAxVc6locg=
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
@@ -76,28 +83,45 @@ github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfb
 github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
-github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
+github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
+github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
+github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
+github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
+github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
+github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
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@@ -249,6 +276,8 @@ golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnf
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
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@@ -263,10 +292,15 @@ golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHl
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@@ -279,18 +313,26 @@ golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn
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@@ -304,14 +346,22 @@ golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7w
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@@ -333,7 +383,16 @@ golang.org/x/tools v0.0.0-20190816200558-6889da9d5479/go.mod h1:b+2E5dAYhXwXZwtn
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 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
 google.golang.org/api v0.7.0/go.mod h1:WtwebWUNSVBH/HAw79HIFXZNqEvBhG+Ra+ax0hx3E3M=
 google.golang.org/api v0.8.0/go.mod h1:o4eAsZoiT+ibD93RtjEohWalFOjRDx6CVaqeizhEnKg=
@@ -351,14 +410,33 @@ google.golang.org/genproto v0.0.0-20190502173448-54afdca5d873/go.mod h1:VzzqZJRn
 google.golang.org/genproto v0.0.0-20190801165951-fa694d86fc64/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55/go.mod h1:DMBHOl98Agz4BDEuKkezgsaosCRResVns1a3J2ZsMNc=
 google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
-google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a h1:Ob5/580gVHBJZgXnff1cZDbG+xLtMVE5mDRTe+nIsX4=
 google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
+google.golang.org/genproto v0.0.0-20200513103714-09dca8ec2884/go.mod h1:55QSHmfGQM9UVYDPBsyGGes0y52j32PQ3BqQfXhyH3c=
+google.golang.org/genproto v0.0.0-20200526211855-cb27e3aa2013/go.mod h1:NbSheEEYHJ7i3ixzK3sjbqSGDJWnxyFXZblF3eUsNvo=
+google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c h1:wtujag7C+4D6KMoulW9YauvK2lgdvCMS260jsqqBXr0=
+google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c/go.mod h1:UODoCrxHCcBojKKwX1terBiRUaqAsFqJiF615XL43r0=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
 google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
-google.golang.org/grpc v1.24.0 h1:vb/1TCsVn3DcJlQ0Gs1yB1pKI6Do2/QNwxdKqmc/b0s=
+google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.24.0/go.mod h1:XDChyiUovWa60DnaeDeZmSW86xtLtjtZbwvSiRnRtcA=
+google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
+google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
+google.golang.org/grpc v1.33.1/go.mod h1:fr5YgcSWrqhRRxogOsw7RzIpsmvOZ6IcH4kBYTpR3n0=
+google.golang.org/grpc v1.38.0 h1:/9BgsAsa5nWe26HqOlvlgJnqBuktYOLCgjCPqsa56W0=
+google.golang.org/grpc v1.38.0/go.mod h1:NREThFqKR1f3iQ6oBuvc5LadQuXVGo9rkm5ZGrQdJfM=
+google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
+google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
+google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=
+google.golang.org/protobuf v1.20.1-0.20200309200217-e05f789c0967/go.mod h1:A+miEFZTKqfCUM6K7xSMQL9OKL/b6hQv+e19PK+JZNE=
+google.golang.org/protobuf v1.21.0/go.mod h1:47Nbq4nVaFHyn7ilMalzfO3qCViNmqZ2kzikPIcrTAo=
+google.golang.org/protobuf v1.22.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.0/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.23.1-0.20200526195155-81db48ad09cc/go.mod h1:EGpADcykh3NcUnDUJcl1+ZksZNG86OlYog2l/sGQquU=
+google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
+google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
+google.golang.org/protobuf v1.26.0 h1:bxAC2xTBsZGibn2RTntX0oH50xLsqy1OxA9tTL3p/lk=
+google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
@@ -372,9 +450,11 @@ gopkg.in/sourcemap.v1 v1.0.5/go.mod h1:2RlvNNSMglmRrcvhfuzp4hQHwOtjxlbjX7UPY/GXb
 gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bli9HhUf9+ttbYbLASfIpnQbh74=
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY=
+gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
diff --git a/main.go b/main.go
index 0a0c4f7..b354899 100644
--- a/main.go
+++ b/main.go
@@ -2,13 +2,14 @@ package main
 
 import (
 	"fmt"
+	"math"
 	"strconv"
 	"strings"
 	"time"
 
 	human "github.com/dustin/go-humanize"
-	"github.com/sensu-community/sensu-plugin-sdk/sensu"
-	"github.com/sensu/sensu-go/types"
+	corev2 "github.com/sensu/sensu-go/api/core/v2"
+	"github.com/sensu/sensu-plugin-sdk/sensu"
 	"github.com/shirou/gopsutil/disk"
 )
 
@@ -19,14 +20,18 @@ type Config struct {
 	ExcludeFSType   []string
 	IncludeFSPath   []string
 	ExcludeFSPath   []string
+	ExtraTags       []string
 	Warning         float64
 	Critical        float64
+	NormalGiB       float64
+	Magic           float64
+	MinimumGiB      float64
 	IncludePseudo   bool
 	IncludeReadOnly bool
 	FailOnError     bool
 	HumanReadable   bool
 	MetricsMode     bool
-	ExtraTags       []string
+	Verbose         bool
 }
 
 type MetricGroup struct {
@@ -83,8 +88,8 @@ var (
 		},
 	}
 
-	options = []*sensu.PluginConfigOption{
-		{
+	options = []sensu.ConfigOption{
+		&sensu.SlicePluginConfigOption[string]{
 			Path:      "include-fs-type",
 			Env:       "",
 			Argument:  "include-fs-type",
@@ -93,7 +98,7 @@ var (
 			Usage:     "Comma separated list of file system types to check",
 			Value:     &plugin.IncludeFSType,
 		},
-		{
+		&sensu.SlicePluginConfigOption[string]{
 			Path:      "exclude-fs-type",
 			Env:       "",
 			Argument:  "exclude-fs-type",
@@ -102,7 +107,7 @@ var (
 			Usage:     "Comma separated list of file system types to exclude from checking",
 			Value:     &plugin.ExcludeFSType,
 		},
-		{
+		&sensu.SlicePluginConfigOption[string]{
 			Path:      "include-fs-path",
 			Env:       "",
 			Argument:  "include-fs-path",
@@ -111,7 +116,7 @@ var (
 			Usage:     "Comma separated list of file system paths to check",
 			Value:     &plugin.IncludeFSPath,
 		},
-		{
+		&sensu.SlicePluginConfigOption[string]{
 			Path:      "exclude-fs-path",
 			Env:       "",
 			Argument:  "exclude-fs-path",
@@ -120,7 +125,7 @@ var (
 			Usage:     "Comma separated list of file system paths to exclude from checking",
 			Value:     &plugin.ExcludeFSPath,
 		},
-		{
+		&sensu.PluginConfigOption[float64]{
 			Path:      "warning",
 			Env:       "",
 			Argument:  "warning",
@@ -129,7 +134,7 @@ var (
 			Usage:     "Warning threshold for file system usage",
 			Value:     &plugin.Warning,
 		},
-		{
+		&sensu.PluginConfigOption[float64]{
 			Path:      "critical",
 			Env:       "",
 			Argument:  "critical",
@@ -138,7 +143,36 @@ var (
 			Usage:     "Critical threshold for file system usage",
 			Value:     &plugin.Critical,
 		},
-		{
+		&sensu.PluginConfigOption[float64]{
+			Path:      "normal",
+			Env:       "",
+			Argument:  "normal",
+			Shorthand: "n",
+			Default:   float64(20),
+			Usage: `Value in GiB. Levels are not adapted for filesystems of exactly this ` +
+				`size, where levels are reduced for smaller filesystems and raised ` +
+				`for larger filesystems.`,
+			Value: &plugin.NormalGiB,
+		},
+		&sensu.PluginConfigOption[float64]{
+			Path:      "magic",
+			Env:       "",
+			Argument:  "magic",
+			Shorthand: "m",
+			Default:   float64(1),
+			Usage:     `Magic factor to adjust warn/crit thresholds. Example: .9`,
+			Value:     &plugin.Magic,
+		},
+		&sensu.PluginConfigOption[float64]{
+			Path:      "minimum",
+			Env:       "",
+			Argument:  "minimum",
+			Shorthand: "l",
+			Default:   float64(100),
+			Usage:     `Minimum size to adjust (in GiB)`,
+			Value:     &plugin.MinimumGiB,
+		},
+		&sensu.PluginConfigOption[bool]{
 			Path:      "include-pseudo-fs",
 			Env:       "",
 			Argument:  "include-pseudo-fs",
@@ -147,7 +181,7 @@ var (
 			Usage:     "Include pseudo-filesystems (e.g. tmpfs) (default false)",
 			Value:     &plugin.IncludePseudo,
 		},
-		{
+		&sensu.PluginConfigOption[bool]{
 			Path:      "fail-on-error",
 			Env:       "",
 			Argument:  "fail-on-error",
@@ -156,7 +190,7 @@ var (
 			Usage:     "Fail and exit on errors getting file system usage (e.g. permission denied) (default false)",
 			Value:     &plugin.FailOnError,
 		},
-		{
+		&sensu.PluginConfigOption[bool]{
 			Path:      "include-read-only",
 			Env:       "",
 			Argument:  "include-read-only",
@@ -165,7 +199,7 @@ var (
 			Usage:     "Include read-only filesystems (default false)",
 			Value:     &plugin.IncludeReadOnly,
 		},
-		{
+		&sensu.PluginConfigOption[bool]{
 			Path:      "human-readable",
 			Env:       "",
 			Argument:  "human-readable",
@@ -174,7 +208,7 @@ var (
 			Usage:     "print sizes in powers of 1024 (default false)",
 			Value:     &plugin.HumanReadable,
 		},
-		{
+		&sensu.PluginConfigOption[bool]{
 			Path:     "metrics",
 			Env:      "",
 			Argument: "metrics",
@@ -182,7 +216,7 @@ var (
 			Usage:    "Output metrics instead of human readable output",
 			Value:    &plugin.MetricsMode,
 		},
-		{
+		&sensu.SlicePluginConfigOption[string]{
 			Path:     "tags",
 			Env:      "",
 			Argument: "tags",
@@ -198,7 +232,7 @@ func main() {
 	check.Execute()
 }
 
-func checkArgs(event *types.Event) (int, error) {
+func checkArgs(event *corev2.Event) (int, error) {
 	if len(plugin.IncludeFSType) > 0 && len(plugin.ExcludeFSType) > 0 {
 		return sensu.CheckStateCritical, fmt.Errorf("--include-fs-type and --exclude-fs-type are mutually exclusive")
 	}
@@ -220,7 +254,7 @@ func checkArgs(event *types.Event) (int, error) {
 	return sensu.CheckStateOK, nil
 }
 
-func executeCheck(event *types.Event) (int, error) {
+func executeCheck(event *corev2.Event) (int, error) {
 	var (
 		criticals int
 		warnings  int
@@ -293,13 +327,16 @@ func executeCheck(event *types.Event) (int, error) {
 
 		tags["mountpoint"] = p.Mountpoint
 		device := p.Mountpoint
+		if len(device) == 0 {
+			continue
+		}
 		s, err := disk.Usage(device)
 		if err != nil {
 			if plugin.FailOnError {
 				return sensu.CheckStateCritical, fmt.Errorf("Failed to get disk usage for %s, error: %v", device, err)
 			}
 			if !plugin.MetricsMode {
-				fmt.Printf("%s  UNKNOWN: %s - error: %v\n", plugin.PluginConfig.Name, device, err)
+				fmt.Printf("%s  UNKNOWN: dev: <%s> - error: %v\n", plugin.PluginConfig.Name, device, err)
 			}
 			continue
 		}
@@ -310,13 +347,23 @@ func executeCheck(event *types.Event) (int, error) {
 		}
 
 		// implement magic factor for larger file systems?
+		tot := float64(s.Total)
+		bcrit := plugin.Critical
+		bwarn := plugin.Warning
+		if tot > (plugin.MinimumGiB * math.Pow(1024, 3)) {
+			bcrit = adjPercent(tot, plugin.Critical)
+			bwarn = adjPercent(tot, plugin.Warning)
+		}
+
 		crit := 0
 		warn := 0
-		if s.UsedPercent >= plugin.Critical {
+		if plugin.Verbose {
+			fmt.Printf("tot: %v  used: %v crit: %v  warn: %v bcrit: %v bwarn: %v\n", tot, s.UsedPercent, plugin.Critical, plugin.Warning, bcrit, bwarn)
+		}
+		if s.UsedPercent >= bcrit {
 			criticals++
 			crit = 1
-		}
-		if s.UsedPercent >= plugin.Warning {
+		} else if s.UsedPercent >= bwarn {
 			warnings++
 			warn = 1
 		}
@@ -429,3 +476,29 @@ func contains(a []string, s string) bool {
 	}
 	return false
 }
+
+func adjPercent(sizeInBytes float64, percent float64) float64 {
+	if sizeInBytes <= 0.0 {
+		return percent
+	}
+	if plugin.NormalGiB <= 0.0 {
+		return percent
+	}
+	if percent <= 0.0 {
+		return 0.0
+	}
+	hsize := (sizeInBytes / math.Pow(1024.0, 3)) / plugin.NormalGiB
+	felt := math.Pow(hsize, plugin.Magic)
+	scale := felt / hsize
+	adjustedPercent := 100.0 - ((100.0 - percent) * scale)
+	if plugin.Verbose {
+		fmt.Printf("hsize: %v felt: %v scale %v adjusted: %v\n", hsize, felt, scale, adjustedPercent)
+	}
+	if adjustedPercent < 0 {
+		return 0.0
+	}
+	if adjustedPercent > 100 {
+		return 100.0
+	}
+	return adjustedPercent
+}
diff --git a/main_test.go b/main_test.go
index 843e4d0..d8f699c 100644
--- a/main_test.go
+++ b/main_test.go
@@ -3,15 +3,95 @@ package main
 import (
 	"testing"
 
-	"github.com/sensu-community/sensu-plugin-sdk/sensu"
 	corev2 "github.com/sensu/sensu-go/api/core/v2"
+	"github.com/sensu/sensu-plugin-sdk/sensu"
 	"github.com/stretchr/testify/assert"
 )
 
-func TestMain(t *testing.T) {
+func clearOptions() {
+	plugin.IncludeFSType = nil
+	plugin.ExcludeFSType = nil
+	plugin.IncludeFSPath = nil
+	plugin.ExcludeFSPath = nil
+	plugin.ExtraTags = nil
+	plugin.Warning = 85.0
+	plugin.Critical = 95.0
+	plugin.MinimumGiB = 100.0
+	plugin.NormalGiB = 20.0
+	plugin.MetricsMode = false
+	plugin.Verbose = false
+}
+
+func TestAdjPercent(t *testing.T) {
+	clearOptions()
+	percent := 80.0
+	assert := assert.New(t)
+	result := adjPercent(0.0, percent)
+	assert.Equal(percent, result)
+	plugin.NormalGiB = 0.0
+	result = adjPercent(100.0, percent)
+	assert.Equal(percent, result)
+	plugin.NormalGiB = 20.0
+	result = adjPercent(100.0, -1.0)
+	assert.Equal(0.0, result)
+	plugin.Verbose = true
+	result = adjPercent(0.8*plugin.NormalGiB*1.074e+9, percent)
+	assert.Greater(percent, result)
+	assert.LessOrEqual(0.0, result)
+	assert.GreaterOrEqual(100.0, result)
+	result = adjPercent(10.0*plugin.NormalGiB*1.074e+9, percent)
+	assert.Less(percent, result)
+	assert.LessOrEqual(0.0, result)
+	assert.GreaterOrEqual(100.0, result)
+
+}
+
+func TestIsValidFSType(t *testing.T) {
+	clearOptions()
+	assert := assert.New(t)
+	plugin.IncludeFSType = []string{"ext4", "xfs"}
+	result := isValidFSType("ext4")
+	assert.True(result)
+	result = isValidFSType("xfs")
+	assert.True(result)
+	result = isValidFSType("bad")
+	assert.False(result)
+	clearOptions()
+	plugin.ExcludeFSType = []string{"ext4", "xfs"}
+	result = isValidFSType("bad")
+	assert.True(result)
+	result = isValidFSType("ext4")
+	assert.False(result)
+	result = isValidFSType("xfs")
+	assert.False(result)
+
+}
+
+func TestIsValidFSPath(t *testing.T) {
+	clearOptions()
+	assert := assert.New(t)
+	result := isValidFSPath("/mount1")
+	assert.True(result)
+	plugin.IncludeFSPath = []string{"/mount1/", "/mount2"}
+	result = isValidFSPath("/mount1/")
+	assert.True(result)
+	result = isValidFSPath("/mount2")
+	assert.True(result)
+	result = isValidFSPath("/mount3")
+	assert.False(result)
+	clearOptions()
+	plugin.ExcludeFSPath = []string{"/mount1", "/mount2"}
+	result = isValidFSPath("/mount3")
+	assert.True(result)
+	result = isValidFSPath("/mount1")
+	assert.False(result)
+	result = isValidFSPath("/mount2")
+	assert.False(result)
+
 }
 
 func TestCheckArgs(t *testing.T) {
+	clearOptions()
 	assert := assert.New(t)
 	event := corev2.FixtureEvent("entity1", "check1")
 	plugin.IncludeFSType = []string{"ext4", "xfs}"}
@@ -35,4 +115,39 @@ func TestCheckArgs(t *testing.T) {
 	i, e = checkArgs(event)
 	assert.Equal(sensu.CheckStateOK, i)
 	assert.NoError(e)
+	plugin.ExtraTags = []string{"tmpfs", "devtmpfs"}
+	i, e = checkArgs(event)
+	assert.Equal(sensu.CheckStateCritical, i)
+	assert.Error(e)
+	plugin.ExtraTags = []string{"key1=val1", "key2=val2"}
+	i, e = checkArgs(event)
+	assert.Equal(sensu.CheckStateOK, i)
+	assert.NoError(e)
+
+}
+
+func TestExecuteCheck(t *testing.T) {
+	clearOptions()
+	plugin.MetricsMode = true
+	plugin.ExcludeFSPath = []string{"/dev"}
+	assert := assert.New(t)
+	event := corev2.FixtureEvent("entity1", "check1")
+	i, e := executeCheck(event)
+	assert.Equal(sensu.CheckStateOK, i)
+	assert.NoError(e)
+	clearOptions()
+	plugin.Warning = -200.0
+	plugin.Critical = -100.0
+	// Set minimum extremely high to disable magic adjustment
+	plugin.MinimumGiB = 100000.0
+	i, e = executeCheck(event)
+	assert.Equal(sensu.CheckStateCritical, i)
+	assert.NoError(e)
+	// Set minimum low and normal high to enable magic adjustment
+	plugin.NormalGiB = 100000.0
+	plugin.MinimumGiB = 1.0
+	plugin.Verbose = true
+	i, e = executeCheck(event)
+	assert.Equal(sensu.CheckStateCritical, i)
+	assert.NoError(e)
 }