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Re: [linux-lvm] lvmconvert --merge fails to remove devices on rebbot



Mike,

Thanks for helping me out with this. I was not aware of the
lvm2-monitor service. I have configured it and now the snapshot lvs
get removed once the merging is complete.

I will investigate the dracut udev rules to see if I can fix the I/O
errors (although for now I can work around by putting 'nodmraid' on my
kernel command line).


Thanks again and have a good day!

Dusty Mabe

On Wed, Feb 8, 2012 at 2:52 PM, Mike Snitzer <snitzer redhat com> wrote:
> On Wed, Feb 08 2012 at  2:10pm -0500,
> Dusty Mabe <dustymabe gmail com> wrote:
>
>> Hi,
>>
>> I am on CentOS 6.2  (kernel-2.6.32-220.el6.x86_64.rpm,
>> lvm2-2.02.87-6.el6.x86_64.rpm). I am seeing an issue similar to
>> https://bugzilla.redhat.com/show_bug.cgi?id=651007 where I still have
>> snapshot lvs present after I merge them back into the origin devices.
>>
>> The steps are :
>>
>> - create snapshot
>> - lvconvert --merge (on open lv so that the merge will happen on next reboot)
>> - reboot
>> - after reboot the lvs have been restored to original, but 'lvs -a'
>> still shows snapshot lvs
>>
>> I was seeing many I/O errors during bootup like are shown in comment
>> 13 of https://bugzilla.redhat.com/show_bug.cgi?id=651402 . I disabled
>> dmraid on bootup and I no longer get these errors but the snapshot lvs
>> are still present after the merge has taken place.
>
> Odd considering dracut's modules.d/90dmraid/61-dmraid-imsm.rules was
> patched to be DM_UDEV_DISABLE_OTHER_RULES_FLAG aware in RHEL 6.1 (via RH
> bug# 650959).
>
>> lvchange --refresh will clear up the snapshot lvs.
>
> Implies the lvm2 polldaemon code isn't cleaning up the merged snapshot
> lvs after the merge completes: I'm not sure what is going on there
> because the issue was fixed in RHEL 6.1 (via RH bug# 645488).
>
>> I do notice that dracut is touching the lvs (the ones to be merged)
>> early in the boot process:
>>
>> dracut: Scanning devices vda2  for LVM logical volumes vgroot/plat_root
>> dracut: inactive Original '/dev/vgroot/plat_root' [1.00 GiB] inherit
>> dracut: inactive Original '/dev/vgroot/plat_var' [1.00 GiB] inherit
>> dracut: inactive Original '/dev/vgroot/plat_usr' [4.00 GiB] inherit
>> dracut: inactive '/dev/vgroot/plat_tmp' [1.00 GiB] inherit
>> EXT4-fs (dm-2): orphan cleanup on readonly fs
>> EXT4-fs (dm-2): 1 orphan inode deleted
>> EXT4-fs (dm-2): recovery complete
>> EXT4-fs (dm-2): mounted filesystem with ordered data mode. Opts:
>> dracut: Mounted root filesystem /dev/mapper/vgroot-plat_root
>> SELinux:  Disabled at runtime.
>> type=1404 audit(1328721625.889:2): selinux=0 auid=4294967295 ses=4294967295
>> dracut:
>> dracut: Switching root
>>                 Welcome to CentOS
>>
>>
>> Is there an issue with dracut accessing and mounting the root lv
>> (which was set to be merged on next activation) ?
>
> Activating the root LV will initiate the merge.  The fact that you only
> need to 'lvchange --refresh' to clean up the dangling snapshot lvs means
> that the merge did complete.
>
> Once the system pivots ("dracut: Switching root") the normal lvm-monitor
> service should initiate both monitoring and polling of all active lvs.
> Do you have the lvm2-monitor service enabled?  And do you see messages
> like the following at startup?:
> Background polling started for 1 logical volume(s) in volume group "vgroot"


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