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Code regression caused corruption of thin snapshot, if the underlaying pool was created without zeroing (which is non-default option used in some particular cases).
As a consequence the first 4KB in the snapshot could have been invalided. This regression has been fixed.
Description of problem:
Can not create thin snapshots when pool is created with --zero n.
Version-Release number of selected component (if applicable):
lvm2-2.02.99-0.367.el6_4.x86_64 (upstream)
How reproducible:
100%
Steps to Reproduce:
#!/bin/bash
VG=vg
POOL=pool
ORIGIN=origin
SNAP=snap
OPTS="--zero n"
lvcreate --thin -L 2G $OPTS ${VG}/${POOL}
lvcreate --virtualsize 500M --thinpool ${VG}/${POOL} -n ${ORIGIN}
lvcreate -s /dev/${VG}/${ORIGIN} -n ${SNAP} -vvvv &> lvcreate-s-failed.$(date "+%Y%m%d-%H%M%S").out
Actual results:
Last lvcreate fails as snap device is not activated and can not be written to:
/dev/vg/snap: not found: device not cleared
Aborting. Failed to wipe snapshot exception store.
Expected results:
Pass
Additional info:
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHBA-2013-1704.html
Description of problem: Can not create thin snapshots when pool is created with --zero n. Version-Release number of selected component (if applicable): lvm2-2.02.99-0.367.el6_4.x86_64 (upstream) How reproducible: 100% Steps to Reproduce: #!/bin/bash VG=vg POOL=pool ORIGIN=origin SNAP=snap OPTS="--zero n" lvcreate --thin -L 2G $OPTS ${VG}/${POOL} lvcreate --virtualsize 500M --thinpool ${VG}/${POOL} -n ${ORIGIN} lvcreate -s /dev/${VG}/${ORIGIN} -n ${SNAP} -vvvv &> lvcreate-s-failed.$(date "+%Y%m%d-%H%M%S").out Actual results: Last lvcreate fails as snap device is not activated and can not be written to: /dev/vg/snap: not found: device not cleared Aborting. Failed to wipe snapshot exception store. Expected results: Pass Additional info: