vgchange in cluster mode

[Rene Mendez_4]

Hello I need help

Configuration:
vgname vgext
disk /dev/dsk/c10t2d0

MirroUX disk /dev/dsk/c10t2d1

Configure with cluster and mirror
# VGCHANGE="vgchange -a e -q n"
# VGCHANGE="vgchange -a e -q n -s"

When use -s

Regard

[Duncan Edmonstone · Accepted solution]

Rene,

The '-s' tells vgchange not to start synchronising stale extents on the physical volumes (disks). YOu might want to set this to prevent performance problems following some kind of IO failure (such as SCSI or FC, or even disk failure). When a physical volume is activated as part of a vgchange -a e or -a y, then stales extens are synchronised. This can generate a lot of IO which might disable your application performance. Setting the -s option in vgchange prevents this, you can then use vgsync or lvsync manually at some later point (during the night?) to resync your extents.

Of course if you set it, you need to introduce some check for stale extents so you don't miss them...

HTH

Duncan

[Rene Mendez_4]

Thanks a lot