Ubuntu
lvm2 package

  1. Bug #1082325
  2. Comment #3

Comment 3 for bug 1082325

Revision history for this message
Arnd (arnd-arndnet) wrote :

Comments for SRU consideration (https://wiki.ubuntu.com/StableReleaseUpdates)

[Impact]

 * Setting issue_discards=1 in /etc/lvm.conf (non-default) results in data loss, if pvmove is performed
on a Logical Volume which is moved to or form an SSD or other block devices which supports discards
 * As this bug *directly cause a loss of user data* this fix should be uploaded to quantal (lvm2 in precise is not effected, because it does not support the issue_discards option.

[Test Case]

 * Enable issue_discards=1 in /etc/lvm.conf
 * Create a volumegroup with two physical volumes (at least one of these must support discards (e.g. an SSD)
 * Create a test logical volume
 * Create a filesystem on this logical volume
 * With pvmove, move the underlying logical volume to the other physical volume
=> experience Data loss (in my experiments the whole logical volume was zeroed, checked with hexdumd /dev/vgtest/lvtest)

[Regression Potential]

 * The upload 2.02.95-5ubuntu1 pulls in some other changes, however they do not seem be critical.