online remove VG from running HA

[j773303]

Hi Expert,
OS 11.23
G
Could it be remove VG from running package? For ex: vg12 is exists in PKG cntl file, can it vgchange -a n vg12 while PKG is still running? Thanks.

[tkc]

if the package is using vg12, you will have to down the package before deactivate vg12.

[j773303]

Hi tkc,
would the package control script will monitor the active VG/LV/FS ?

[tkc · Accepted solution]

the package control script will only be read during cluster/package startup/shutdown.

[j773303]

Hi tkc,
Yes , I know. so my mean is HA would monitor VG in PKG active?

What will happen if "vgchange -a n vg12" in PKG running status?

[whiteknight]

hi,

Yes you can do so.

After unmounting any new filesystems belonging to the new volume group that was added, the volume group can be deactivated, and then reactivated in exclusive mode without halting the package or Serviceguard.


# vgchange -a n

# vgchange -c y ... marks VG under SG control

# vgchange -a e ... activates the VG in exclusive mode

WK
please assign points

[Wim Rombauts]

There are two answers to yuor question :
1) Can you remove a VG from a running package ?
-> If not fillesystems or RAW LVM's are used on this VG, yes you can. (vgchange -a n)
If you want to definitely remove the VG, remember to also remove it from the cntl file, or the package script will detect a conflict : It cannot disable a VG that is already disabled.

2)Will the package keep running after the vgchange -a n ?
It depends : If the package monitor checks the presence of the configured VG's in the package, then the package monitor will automaitcally re-enable the VG, and finaly stop the package if it cannot do so.

[skt_skt]

i do similar VG maintenance on the VG whihc is active with a package(on RAC cluster).(vgchange operation). But i make sure that no one is using it.