MWC NOMWC

[A.G.M. Velthof]

Hello,

we have a new two node cluster running hpux11.31
As I created as we always do a volumegroup, logical volumes and the filesystems, I can activate the group and mount the filesystems.
After an export of the volumegroup and import on the other node I can activate the group and mount the filesystems.
Our next step was always:
vgchange -S y -c y "volumegroup", to make it shareble and cluster aware.
Now I get the error:
vgchange: Couldn't activate volumegroup "vg.."
Shared server activation requires all mirrored Logical Volumes to have Consistency Recovery of NOMWC or NONE.

We did never have this behaviour before, is this something new in 11.31?

Thanks, Alfons

[Antim Yosifov]

http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01919369/c01919369.pdf (BSC link updated by admin)

Page 17

Can it be that there is SGeRAC?

In the latest SGeRAC manual (Click here to see the manual at http://h20000.www2.hp.com/bc/docs/support/SupportManual/c02047975/c02047975.pdf (BSC link updated by admin)) on page 43 it reads:

Mirroring and Resilvering

On node and cluster wide failures, when SLVM mirroring is used and Oracle
resilvering is available, the recommendation for the logical volume mirror
recovery policy is set to full mirror re-synchronization (NOMWC) for
control and redo files and no mirror re-synchronization (NONE) for
the datafiles since Oracle would perform resilvering on the
datafiles based on the redo log.



Therefore each logical volume created in a VG activated in 'shared' mode should be changed to use NOMWC or NONE.

LVM does not permit modifications to volume groups marked for 'shared' activation. Therefore the affected VG must first be changed to activate in standard mode or exclusive mode, then set NOMWC and then configure the VG to activate in shared-mode.

[A.G.M. Velthof]

Thanks