OHASD

11gR2 RAC

How ohasd will know which disk contains voting disk? Following is the ASM disk header metadata (dumped using kfed). ohasd use the markers between vfstart & vfend.

If the markers between vfstart & vfend are 0 then disk does *NOT* contain voting disk

[root@rac1] kfed read ‘/dev/sdi’ | grep vf
kfdhdb.vfstart: 130; 0x0ec: 0×00000060
kfdhdb.vfend: 168; 0x0f0: 0x000000d0

[root@rac1] kfed read ‘/dev/sdg’ | grep vf
kfdhdb.vfstart: 0 ; 0x0ec: 0×00000000
kfdhdb.vfend: 0 ; 0x0f0: 0×00000000

[root@rac1] kfed read ‘/dev/sdh’ | grep vf
kfdhdb.vfstart: 0 ; 0x0ec: 0×00000000
kfdhdb.vfend: 0 ; 0x0f0: 0×00000000

So from above output, disk ‘/dev/sdi’ contains voting disk.

Conclusion: The way to handle Voting Disk and OCR has changed significantly – they can be kept inside of an ASM Diskgroup especially.