Why do RHEV hypervisors run out of disk space in /var/log?

Solution Verified - Updated -

Issue

  • Why does df report a higher amount of disk usage than du for the filesystem where /var/log resides?

    # df -kh /var
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vgos-lvol_var
                       12G  6.2G  5.1G  55% /var

# du -khs /var
2.5G    /var

  • Also, the following error message is shown in the RHEV Manager Audit log:

    Critical, Low disk space. Host has less than 500 MB of free space left on: /var/log

Environment

  • Red Hat Enterprise Virtualization 3.1
  • For RHEL based hosts vdsm versions:
    • 4.10.2-1.6.el6
    • 4.10.2-1.8.el6
    • 4.10.2-1.9.el6
  • For RHEV-H based hosts rhev-hypervisor6 versions:
    • 6.4-20130415.0.el6_4
    • 6.4-20130318.1.el6_4
    • 6.4-20130306.2.el6_4
    • 6.4-20130221.0.el6

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