Can't get rid of INACTIVE read/write snapshot
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).
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
Quoted 9 lines
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
Quoted 46 lines
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
[email protected]
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
.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
Quoted 11 lines
Quoted 1 line
Quoted 1 line
Mikulas Patocka <[email protected]> 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.
Quoted 7 lines
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
Quoted 47 lines
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
[email protected]
https://www.redhat.com/mailman/listinfo/linux-lvm
read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/