Disk used percentage does not consider reserved disk space - disk space rule is not firing (4256408)

Disk used percentage inaccurate when compared to df -k and the disk space rule is not firing when a disk is filled up.

Foglight reports disk used percentage at 26.8% while df -k reports disk used percentage at 29%.

Foglight's current calculation does not take into account for the reserved disk space for root that is not available to the user,. The reserved disk space is by default 5%. Current calculation is [used space]/[total Space]*100. The more accurate calculation should be [used space]/([used space] + [free space])*100

IC-1571 - "Disk used % should take into account reserved space." This is for Solaris and Linux.

IC-2367 - is for AIX and HP-UX.

WORKAROUND:

Workaround for disk space rule would be to change the scope of the INF_FileSystemCapacityWarning, INF_FileSystemCapacityCritical,  INF_FileSystemCapacityFatal registries threshold so that the alarm will be fired earlier.

STATUS:

IC-1571 is fixed in version 5.8.5 of the Infrastructure Cartridge.  The latest version can be downloaded here.

IC-2367 is still in progress and waiting for fix in a future release of Infrastructure Cartridge.