Collectd

Disk Plugin

To collect disk use stats from zvols use the following.
Requires that collectd is built with libudev, ubuntu does this.
NOTE: You cannot monitor other disks with this configuration.

/etc/collectd/collectd.conf.d/disk.conf:

LoadPlugin disk

<Plugin disk>
  Disk "/dev\/disk\/by-path/"
  Disk "/dev\/disk\/by-id/"
  Disk "/dev\/disk\/by-uuid/"
  Disk "/dev\/disk\/by-partuuid/"
  Disk "/dev\/disk\/by-partlabel/"
  Disk "/dev\/local/"
  Disk "/dev\/mapper/"

  IgnoreSelected true
  UdevNameAttr "DEVLINKS"
</Plugin>

When graphite receives this data it will create directories named like:

disk-dev_zvol_poolid_zvol-name

which will contain the various whisper database files (.wsp).