Stale extents on both sides of vg00 mirror

[luissma]

Hi all,

(HP-UX 11.11) I've found that my vg00 has crossed stale extents on both sides of the mirror:

LV Name                     /dev/vg00/lvol1

LV Name                     /dev/vg00/lvol2

LV Name                     /dev/vg00/lvol3
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00422 current  /dev/dsk/c2t2d0    00422 stale
   00001 /dev/dsk/c1t2d0    00423 stale    /dev/dsk/c2t2d0    00423 current
   00002 /dev/dsk/c1t2d0    00424 current  /dev/dsk/c2t2d0    00424 stale
   00003 /dev/dsk/c1t2d0    00425 current  /dev/dsk/c2t2d0    00425 stale
   00004 /dev/dsk/c1t2d0    00426 current  /dev/dsk/c2t2d0    00426 stale
   00007 /dev/dsk/c1t2d0    00429 current  /dev/dsk/c2t2d0    00429 stale
   00010 /dev/dsk/c1t2d0    00432 current  /dev/dsk/c2t2d0    00432 stale
   00034 /dev/dsk/c1t2d0    00456 current  /dev/dsk/c2t2d0    00456 stale

LV Name                     /dev/vg00/lvol4
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00486 current  /dev/dsk/c2t2d0    00486 stale

LV Name                     /dev/vg00/lvol5
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00550 stale    /dev/dsk/c2t2d0    00550 current
   00120 /dev/dsk/c1t2d0    00670 current  /dev/dsk/c2t2d0    00670 stale
   00298 /dev/dsk/c1t2d0    00848 current  /dev/dsk/c2t2d0    00848 stale

LV Name                     /dev/vg00/lvol6
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00886 stale    /dev/dsk/c2t2d0    00886 current
   00316 /dev/dsk/c1t2d0    01202 current  /dev/dsk/c2t2d0    01202 stale
   00317 /dev/dsk/c1t2d0    01203 current  /dev/dsk/c2t2d0    01203 stale
   00416 /dev/dsk/c1t2d0    01302 current  /dev/dsk/c2t2d0    01302 stale
   00491 /dev/dsk/c1t2d0    01377 current  /dev/dsk/c2t2d0    01377 stale
   00492 /dev/dsk/c1t2d0    01378 current  /dev/dsk/c2t2d0    01378 stale
   00497 /dev/dsk/c1t2d0    01383 stale    /dev/dsk/c2t2d0    01383 current

LV Name                     /dev/vg00/lvol7

Is there an easy way of cross-synchronizing these stale extents?

Many thanks in advance!

[Patrick Wallek · Accepted solution]

The first thing I would try is to run a 'vgsync vg00' and let it try to sync all LV's.

If that doesn't get things properly sync'ed then you may have to recover from an Ignite/UX backup.

[luissma]

Yes, I knew I could try to "vgsync" or "lvsync" volumes but, as per the information I received from somebody else, "lvsync" works only in one direction in a way that running it on my cross-stale volumes could harm filesystems.

I any case, this is what happened lately:

There was one non-mirrored volume on vg00 so I thought that before all I could try to mirror it. I did my volmume mirroring and leave and, today, I found that, misteriously, for each lvol, there where stale extents on only one of the sides of the mirror:

LV Name                     /dev/vg00/lvol1
LV Name                     /dev/vg00/lvol2
LV Name                     /dev/vg00/lvol3
LV Status                   available/stale
   00001 /dev/dsk/c1t2d0    00423 stale    /dev/dsk/c2t2d0    00423 current
LV Name                     /dev/vg00/lvol4
LV Name                     /dev/vg00/lvol5
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00550 stale    /dev/dsk/c2t2d0    00550 current
LV Name                     /dev/vg00/lvol6
LV Status                   available/stale
   00000 /dev/dsk/c1t2d0    00886 stale    /dev/dsk/c2t2d0    00886 current
   00497 /dev/dsk/c1t2d0    01383 stale    /dev/dsk/c2t2d0    01383 current
LV Name                     /dev/vg00/lvol7

This makes the situation much easier!!!

Ok, let's try one "lvsync", then:

#lvsync /dev/vg00/lvol6
lvsync: Couldn't re-synchronize stale partitions of the logical volume:
I/O error
lvsync: Couldn't resynchronize logical volume "/dev/vg00/lvol6".

It seems that there is a hardware problem on, at least, one of my disks.

Taking into account that one of the sides is ok I'll try to hot-swap the faulty hard disk drive and synchronize afterwards.

Thanks!