topic Re: sync error in Operating System - HP-UX

sync error

Michael Dalanek — Thu, 10 Aug 2000 05:52:37 GMT

Ive got some stale extents on an lvol but I cant resync it, get the following error;

lvsync: Couldn't re-synchronize stale partitions of the logical volume:
I/O error
lvsync: Couldn't resynchronize logical volume "/dev/vgar04/lvol1".

What can I do to fix it ?

Re: sync error

Stefan Farrelly — Thu, 10 Aug 2000 06:00:29 GMT

This could be a long answer depending on your situation. Lets go for the easiest possible solution. Is your lvol mirrored ? if so, are the stale extents on the primary disk or the mirror ? use lvdisplay -v /dev/vgXX/lvolYY to see if the stale(s) are on PV1 (Primary) or PV2 (mirror). If theyre on PV2 then your in luck, simply remove the mirror using lvreduce -m 0 /dev/vgXX/lvolYY and that takes care of the stales.

You can then either mirror it to another device, if available, or try extending it back to the same device with lvextend -m 1 /dev/vgXX/vlolYY /dev/dsk/cxxxxx. If it mirrors cleanly then your all fixed. If not you may have to remove PV2 from the volume group using vgreduce /dev/vgXX /dev/dsk/cxxxx and try using pvcreate -f on it then adding it back in and extending the mirror again. If the disk has some i/o errors on it you may have to try using mediainit on it the try adding it in again or replace the disk if you still get errors.

Re: sync error

melvyn burnard — Thu, 10 Aug 2000 06:11:00 GMT

sounds like you may have a duff disk as part of the vg.
use the lvdisplay/pvdisplay commands to check out what area this may be on.

Re: sync error

Ramesh Donti — Tue, 15 Aug 2000 06:37:22 GMT

Hi,
Try the following:

1. Reduce the mirror and extend the mirror onto the same PV. if this doesn't fix.

2. Try mirroring onto different PV. If this doesn't fix, then you may have to

3. Take backup of filesystem and re-create the LV and filesystem on to the same LV's.

I faced similar problem, which got solved after going through all the above 3 steps. So ur's might be solved by one of the above,, try them in the order.

Re: sync error

Vincente Fernandes — Tue, 15 Aug 2000 09:06:24 GMT

run a dd on the disk or lv.
dd if=/dev/dsk/c?t?d? of=/dev/null bs=4096k
or
dd if=/dev/vg00/lvol? of=/dev/null bs=4096k
if the dd comes out fine without an I/O error then the disk are fine. Try reducing the mirror by using the foll steps.
lvreduce -m 0 /dev/vg??/lvol? /dev/dsk/c?t?d?
vgreduce /dev/vg?? /dev/dsk/c?t?d?
vgextend /dev/vg?? /dev/dsk/c?t?d?
lvextend -m 1 /dev/vg??/lvol? /dev/dsk/c?t?d?
vgsync /dev/vg??
Hope that helps.