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CMIRRORD_PIDFILE is not defined. This makes the build fail.
Therefore, we need to conditionalize the check for cmirrord
based on if CMIRRORD_PIDFILE is defined.
mirrors, we must also check that the log daemon (cmirrord) is running.
The log module can be auto-loaded, but the daemon cannot be
"auto-started". Failing to check for the daemon produces cryptic
messages that customers have a hard time deciphering. (The system
messages do report that the log daemon is not running, but people
don't seem to find this message easily.)
Here are examples of what is printed when the module is available,
but the log daemon has not been started.
[root@bp-01 LVM2]# lvcreate -m1 -l1 -n lv vg
Shared cluster mirrors are not available.
[root@bp-01 LVM2]# lvcreate -m1 -l1 -n lv vg -v
Setting logging type to disk
Finding volume group "vg"
Archiving volume group "vg" metadata (seqno 3).
Creating logical volume lv
Executing: /sbin/modprobe dm-log-userspace
Cluster mirror log daemon is not running
Shared cluster mirrors are not available.
Creating volume group backup "/etc/lvm/backup/vg" (seqno 4).
When splitting off mirror images from a mirror, we always take
LVs from the end of a list. For example, if the mirror sub-devices
are lv_mimage_[012], we should select lv_mimage_2 if splitting off
one image. However, lv_mimage_0 was being selected instead.
The problem came from calling '_move_removable_mimages_to_end'
when it was unnecessary to do so. When the user /does/ specify
specific devices to be removed, this function properly moved the
appropriate LVs to the end of the list for extraction. However,
if the user /doesn't/ give any specific PVs, the function should
do nothing. '_move_removable_mimages_to_end' was keying off of
whether 'removable_pvs' was NULL or not and this value was
improperly being populated with the set of all available PVs.
This was causing '_move_removable_mimages_to_end' to completely
reverse the list, which in turn caused us to extract the
hithertofore front-of-the-list LVs.
An unhandled condition allowed the command to terminate
cleanly without a warning. Added a check for the
'--splitmirrors' argument to allow execution to the lower
level function that has the check to see if the user is
trying to split a linear device. You should now see a
message if you try to use --splitmirrors on a linear device.
The main problem with these bugs was that the newly split
off LV was not being suspended properly. This meant that
the memlock count was not being balanced, the DM devices
were not being renamed, and some DM devices which should
have been removed were not.
I've also renamed some of the variables and added comments
to make things clearer as to what is going on. (I can break
this patch in two if it means easier review.)
pvchange: Add --metadataignore description
vgchange: Fix minor formatting
pvcreate: Update metadataignore description to refer to pvchange
lvm.conf: Refer to pvcreate and pvchange for metadata options.
Switch dmeventd to use dm_create_lockfile and drop duplicate code.
Allow clvmd pidfile to be configurable.
Switch cmirrord and clvmd to use dm_create_lockfile.
This should bring less confusion when there are some settings left and
people just forgot about it and then they run into problems. These messages
should give them a hint of what's really going on.
even though there was no log. A simple run through the in-tree test
suite would have caught this. :(
- if (lv_is_mirrored(detached_log_lv) &&
+ if (detached_log_lv && lv_is_mirrored(detached_log_lv) &&
Also, made some cosmetic changes suggested by kabi after my last check-in
(e.g. s/return 0/return_0/ and adding an error message).
A previous check-in added logic to handle the case where both images
of a mirrored log failed. It solved the problem by simply removing
the log entirely - leaving the parent mirror with a 'core' log. This
worked for most cases. However, if there was a small delay between
the failures of the two mirrored log devices, the mirror would hang,
LVM would hang, and no additional LVM commands could be issued.
When the first leg of the log fails, it signals the need for repair.
Before 'lvconvert --repair' is run by dmeventd, the second leg fails.
'lvconvert' would see both devices as failed and try to remove the
log entirely. When it came time to suspend the parent mirror to
update the configuration, the suspend would hang because it couldn't
get any I/O through the mirrored log, which was plugged waiting for
corrective action. The solution is to replace the log with an error
target to clear any pending writes before removing it. This allows
the parent mirror to suspend and make the proper changes.
Pass metadataignore through PV creation / setup paths.
As a result of this cleanup, we can remove the unnecessary setting
of mda_ignore bits inside pvcreate_single(), after call to pv_create.
For now, just set metadataignore to '0' in some places. This is
equivalent to the prior functionality, although the 0 is given
by the caller not hardcoded in _mda_setup() call.
Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
