topic Re: vgsyncing happend for every time when I activate vg. in Operating System - HP-UX

vgsyncing happend for every time when I activate vg.

Rajesh SB — Mon, 29 Jul 2002 02:33:21 GMT

Hi,

In one of disk array, I replaced the bad Hard disk
by following these steps.

" * vgcfgrestore -n vg01 -l
* vgchange -a y vg01
It reported about "could not re-synchronize stale partitions...."
Then I remembered that I had removed the entry of the faulty disk from
/etc/lvmtab.
So, I did a vgscan -a, which created /etc/lvmtab and now both "ioscan -fnC
disk" and
"strings /etc/lvmtab" show the entry of the new disk /dev/dsk/c3t3d0
Now, I did a "vgchange -a n vg01" and "vgchange -a y vg01".

I saw that the mirror disks started sync'ing. It took almost one hour and
the command
finished with "volume group vg01 successfully changed".

Now, the problem is everytime I try to activate the volume group it starts
sync'ing. How could we rectify this problem ?

Thanks in advance.

Rajesh SB

Re: vgsyncing happend for every time when I activate vg.

Michael Tully — Mon, 29 Jul 2002 02:46:44 GMT

Hi,

The man page for 'vgchange' even states this:

Quote/
If the -a y or -a e option is executed on a currently active volume group, vgchange attempts to include any physical volumes that were previously listed as missing. This is useful if a physical volume has come back online. However, no automatic synchronization of any mirrored logical volumes is done. If synchronization is required, execute the vgsync command (see vgsync(1M)).
End Quote
At a guess something has obviously gone when the disk was replaced. What I would be tempted to do is to do a 'lvreduce' on each of the logical volumes that are attached on that disk and, remove the disk from the volume group, 'pvcreate -f' the disk 'vgextend' the volume again with this same disk and re-do the mirror.

HTH
Michael

Re: vgsyncing happend for every time when I activate vg.

Michael Tully — Tue, 30 Jul 2002 06:21:01 GMT

HARHA!!!

ZERO Assignment of points from 33 (now 34 responses)

Can we add this user to the black list please..... (I try not to get narky but fair is fair......)

Re: vgsyncing happend for every time when I activate vg.

Ceesjan van Hattum — Tue, 30 Jul 2002 07:16:34 GMT

I assume, but am not 100% sure, that the automated syncing which indeed takes a long time, is initiated by /usr/sbin/syncer. It keeps on watching changes in the vg's and decides by itself to start syncing.

To stop this inconvienence, you can stop the syncer-daemon by:
/sbin/init.d/syncer stop
and you can decide yourself wheter or not to set the /etc/rc.config.d/syncer variable SYNCER=0

Regards,
Ceesjan