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+
+# you can disable an alarm notification by setting the 'to' line to: silent
+
+
+# -----------------------------------------------------------------------------
+# low disk space
+
+# checking the latest collected values
+# raise an alarm if the disk is low on
+# available disk space
+
+template: disk_space_usage
+ on: disk.space
+ os: linux freebsd
+ hosts: *
+families: *
+ calc: $used * 100 / ($avail + $used)
+ units: %
+ every: 1m
+ warn: $this > (($status >= $WARNING ) ? (80) : (90))
+ crit: $this > (($status == $CRITICAL) ? (90) : (98))
+ delay: up 1m down 15m multiplier 1.5 max 1h
+ info: current disk space usage
+ to: sysadmin
+
+template: disk_inode_usage
+ on: disk.inodes
+ os: linux freebsd
+ hosts: *
+families: *
+ calc: $used * 100 / ($avail + $used)
+ units: %
+ every: 1m
+ warn: $this > (($status >= $WARNING) ? (80) : (90))
+ crit: $this > (($status == $CRITICAL) ? (90) : (98))
+ delay: up 1m down 15m multiplier 1.5 max 1h
+ info: current disk inode usage
+ to: sysadmin
+
+
+# -----------------------------------------------------------------------------
+# disk fill rate
+
+# calculate the rate the disk fills
+# use as base, the available space change
+# during the last hour
+
+# this is just a calculation - it has no alarm
+# we will use it in the next template to find
+# the hours remaining
+
+template: disk_fill_rate
+ on: disk.space
+ os: linux freebsd
+ hosts: *
+families: *
+ lookup: min -10m at -50m unaligned of avail
+ calc: ($this - $avail) / (($now - $after) / 3600)
+ every: 1m
+ units: GB/hour
+ info: average rate the disk fills up (positive), or frees up (negative) space, for the last hour
+
+
+# calculate the hours remaining
+# if the disk continues to fill
+# in this rate
+
+template: out_of_disk_space_time
+ on: disk.space
+ os: linux freebsd
+ hosts: *
+families: *
+ calc: ($disk_fill_rate > 0) ? ($avail / $disk_fill_rate) : (inf)
+ units: hours
+ every: 10s
+ warn: $this > 0 and $this < (($status >= $WARNING) ? (48) : (8))
+ crit: $this > 0 and $this < (($status == $CRITICAL) ? (24) : (2))
+ delay: down 15m multiplier 1.2 max 1h
+ info: estimated time the disk will run out of space, if the system continues to add data with the rate of the last hour
+ to: sysadmin
+
+
+# -----------------------------------------------------------------------------
+# disk inode fill rate
+
+# calculate the rate the disk inodes are allocated
+# use as base, the available inodes change
+# during the last hour
+
+# this is just a calculation - it has no alarm
+# we will use it in the next template to find
+# the hours remaining
+
+template: disk_inode_rate
+ on: disk.inodes
+ os: linux freebsd
+ hosts: *
+families: *
+ lookup: min -10m at -50m unaligned of avail
+ calc: ($this - $avail) / (($now - $after) / 3600)
+ every: 1m
+ units: inodes/hour
+ info: average rate at which disk inodes are allocated (positive), or freed (negative), for the last hour
+
+# calculate the hours remaining
+# if the disk inodes are allocated
+# in this rate
+
+template: out_of_disk_inodes_time
+ on: disk.inodes
+ os: linux freebsd
+ hosts: *
+families: *
+ calc: ($disk_inode_rate > 0) ? ($avail / $disk_inode_rate) : (inf)
+ units: hours
+ every: 10s
+ warn: $this > 0 and $this < (($status >= $WARNING) ? (48) : (8))
+ crit: $this > 0 and $this < (($status == $CRITICAL) ? (24) : (2))
+ delay: down 15m multiplier 1.2 max 1h
+ info: estimated time the disk will run out of inodes, if the system continues to allocate inodes with the rate of the last hour
+ to: sysadmin
+
+
+# -----------------------------------------------------------------------------
+# disk congestion
+
+# raise an alarm if the disk is congested
+# by calculating the average disk utilization
+# for the last 10 minutes
+
+template: 10min_disk_utilization
+ on: disk.util
+ os: linux freebsd
+ hosts: *
+families: *
+ lookup: average -10m unaligned
+ units: %
+ every: 1m
+ green: 90
+ red: 98
+ warn: $this > $green * (($status >= $WARNING) ? (0.7) : (1))
+ crit: $this > $red * (($status == $CRITICAL) ? (0.7) : (1))
+ delay: down 15m multiplier 1.2 max 1h
+ info: the percentage of time the disk was busy, during the last 10 minutes
+ to: sysadmin
+
+
+# raise an alarm if the disk backlog
+# is above 1000ms (1s) per second
+# for 10 minutes
+# (i.e. the disk cannot catch up)
+
+template: 10min_disk_backlog
+ on: disk.backlog
+ os: linux
+ hosts: *
+families: *
+ lookup: average -10m unaligned
+ units: ms
+ every: 1m
+ green: 2000
+ red: 5000
+ warn: $this > $green * (($status >= $WARNING) ? (0.7) : (1))
+ crit: $this > $red * (($status == $CRITICAL) ? (0.7) : (1))
+ delay: down 15m multiplier 1.2 max 1h
+ info: average of the kernel estimated disk backlog, for the last 10 minutes
+ to: sysadmin