topic Re: Stale physical extents in Operating System - HP-UX

Stale physical extents

vaman — Tue, 23 Nov 2004 11:01:21 GMT

What is stale physical extents, what causes this & wht is the remedy

Re: Stale physical extents

Sanjay_6 — Tue, 23 Nov 2004 11:04:27 GMT

Hi,

Stale physical extents means the extents for the primary / mirror copy are not in sync.

Stale --> Old / not current.

pvdisplay -v /dev/dsk/cxtydz |grep -i stale |more

This will all the stale extents on the physical disk.

Hope this helps.

Regds

Re: Stale physical extents

Steven E. Protter — Tue, 23 Nov 2004 11:06:59 GMT

Most likely caus is some kind of disk problem has caused your mirrors to stop being maintained.

If a disk has failed, you'll need to replace it.

Once thats done you can break the mirror with lvsplit and then rebuild it with lvextend -m 1 /dev/vg01/lvolname /dev/dsk/c1t1d0

Use a real logical volume name and a real disk.

SEP

Re: Stale physical extents

Sridhar Bhaskarla — Tue, 23 Nov 2004 14:28:32 GMT

Hi Vaman,

YOu may also find stale extents on unmirrored PVs in case if there are any issues with the disks associated with them. Basically the extent that is not accessible by LVM will be marked as stale.

-Sri

Re: Stale physical extents

Bharat Katkar — Wed, 24 Nov 2004 08:12:24 GMT

Hi Vaman,
As rightly said by steven lvsplit and lvextend should do the trick.
Stale extent could be an extent without reference or bad extent.

Well it is better to confirm the disk with stale extent for any physical problem. Use dd command to do the same,
# dd if= of=/dev/null

This will try reading the entire disk without harming the data inside and gives error for any bad blocks.

Hope that helps.
Regards,