Hi Gaurav,
from your comment I get the impression that it is possible to use SCSI3 fencing for data protection and GAB (without SCSI3 fencing) for membership arbitration, however, I struggle to find the correct setting to achieve this. As I see from my tests the VxFEN driver must be loaded and configured, which however does not seem to be possible without a fencing diskgroup. Is it necessary to do customitzed fenmode?
The rationale for my configuration request goes like this: the configuration is fully symmetric between two datacenters with host mirrored disks via vxvm. As there is only one veritas cluster a cps in a third location imposes too much requirements. The most likely cases to happen are power failures at one site or split brain due to switch power failing. On power failure the surviving node should grab the service groups with disks and continue operation which does not always occur on fencing disks asymetric 2+1 lun distribution across storages in the datacenters. It would be acceptable when one node would panic on split brain due to scsi3 reservation on the dg failing.
UseFence=SCSI3 in main.cf but SMF vxfen disabled:
2012/07/25 11:59:19 VCS NOTICE V-16-1-52006 UseFence=SCSI3. Fencing is enabled
2012/07/25 11:59:19 VCS CRITICAL V-16-1-10037 VxFEN driver not configured. Retrying...
2012/07/25 11:59:34 VCS CRITICAL V-16-1-10037 VxFEN driver not configured. Retrying…
UseFence=SCSI3 in main.cf and SMF vxfen enabled with vxfenmode=disabled:
2012/07/25 12:00:36 VCS CRITICAL V-16-1-52024 VxFEN driver is configured in mode=4. VCS Stopping. Manually restart VCS after configuring fencing in SCSI3 or SYBASE or customized mode.
UseFence=None in main.cf and Resource-Property Reservation=SCSI3 at DiskGroup:
2012/07/25 12:03:33 VCS ERROR V-16-10001-1022 (pms10) DiskGroup:PMSProdDg:monitor:Diskgroup cannot be imported with reservations since I/O fencing is not configured.
Kind regards
-- Dago
