Bug#584881: Also in backported squeeze kernel 2.6.32-bpo.5-xen-amd64

[Thomas Aeby <aeby@graeff.com>]

Potentially the same effect with

  Kernel 2.6.32-bpo.5-xen-amd64
  DRBD on top of LVM on top of a RAID1-Volume
  2 SATA-Disks
  Fujitsu Hardware
  one machine with 4, the other with 8 cores
  running XEN

This makes me fear that upgrading to Squeeze would not solve
the problem.

Removing one of the mirrors, thus radically avoiding check/resync
worked around (or at least soothed) the problem.

Interestingly enough, the hung has never occured on the respective
DRBD peers, only on the machines where the heavy loaded VM is
actually running on.

Best regards,
Tom