Antw: Re: [linux-lvm] Can't get rid of INACTIVE read/write snapshot
Marcel Gsteiger
Marcel.Gsteiger at milprog.ch
Mon Jul 21 08:13:09 UTC 2008
.sorry for the delay, I tried again to lvremove, find the strace enclosed.
After the output "flock(3, LOCK_EX
at the end, lvremove seems to go into an endless loop (100% CPU usage).
Then I tried the following:
kill -9 <pid of lvremove>
rm /var/lock/lvm/V_vg00
to remove /var/lock/lvm/V_vg00 "by hand" and tried again. Now the system does not go to 100% CPU usage anymore, but lvremove does not terminate. See my second lvremove2.strace.
As mentioned before, I simply wanted to get rid of a overflowed snapshot and clean up my volume group, as I should extend the LVM in question. How can I safely accomplish this in my situation?
Thanks for your help and best regards
--Marcel
>>> Mikulas Patocka <mpatocka at redhat.com> 03.06.2008 21:15 >>>
> Hi all
>
> I'm using lvm2-2.01.08-2.1 on fc4, kernel 2.6.16-1 with linux-vserver
> patches.
>
> A while ago, I mistakenly created a 39GB read-write snapshot of my
> /vservers partition (which, btw, seemed to work). But after some time
> this partition got to an overflow and since then I can't get rid of it
> anymore. See the lvdisplay output below.
>
> lvchange -an or --refresh gives me a message "Can't change snapshot
> logical volume "vservers_snapshot"".
>
> lvremove lets me wait, then "top" shows 100% IO-Wait but does not come
> to an end (at least after an hour). I don't know how much patience I
> would need, this box is rather fast otherwise (dual xeon 2.8GHz w/ SATA
> drives).
Hi
It looks like an unknown bug in lvremove. Send a strace of lvremove while
it waits for that long amount of time.
Mikulas
> Rebooting does not help anything.
>
> Is there a safe way to simply get rid of this snapshot? Any help would
> much be appreciated.
>
> Regards
> --Marcel
>
> --- Logical volume ---
> LV Name /dev/vg00/lv00_vservers
> VG Name vg00
> LV UUID 9oELP3-2l7d-gTML-2xg2-unTu-znP0-qVd3Mc
> LV Write Access read/write
> LV snapshot status source of
> /dev/vg00/vservers_snapshot [INACTIVE]
> LV Status available
> # open 1
> LV Size 39,06 GB
> Current LE 625
> Segments 1
> Allocation contiguous
> Read ahead sectors 0
> Block device 253:9
>
> --- Logical volume ---
> LV Name /dev/vg00/vservers_snapshot
> VG Name vg00
> LV UUID cQEj3z-V2jD-QOCl-3Yea-ETQZ-Egj9-2B7nd2
> LV Write Access read/write
> LV snapshot status INACTIVE destination for /dev/vg00/lv00_vservers
> LV Status available
> # open 0
> LV Size 39,06 GB
> Current LE 625
> Segments 1
> Snapshot chunk size 4,00 KB
> Allocated to snapshot 100,00%
> Allocation inherit
> Read ahead sectors 0
> Block device 253:8
>
> _______________________________________________
> linux-lvm mailing list
> linux-lvm at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
>
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