11.2 voting disk的冗余及备份

从11.2开始，如果voting disk存放在ASM磁盘组上，voting disk的数目将由ASM磁盘组的冗余级别决定。

The number of voting files you can store in a particular Oracle ASM disk group depends upon the redundancy of the disk group. External redundancy: A disk group with external redundancy can store only one voting disk Normal redundancy: A disk group with normal redundancy stores three voting disks High redundancy: A disk group with high redundancy stores five voting disks

You cannot directly influence the number of voting disks in one disk group. You cannot use the crsctl add | delete votedisk commands on voting disks stored in Oracle ASM disk groups because Oracle ASM manages the number of voting disks according to the redundancy level of the disk group. Neither should you add a voting disk to a cluster file system in addition to the voting disks stored in an Oracle ASM disk group. Oracle does not support having voting disks in Oracle ASM and directly on a cluster file system for the same cluster at the same time.

当配置了voting disks使用ASM后，只能使用crsctl replace votedisk命令来修改voting disks的配置。

Once you configure voting disks on Oracle ASM, you can only make changes to the voting disks' configuration using the crsctl replace votedisk command. This is true even in cases where there are no working voting disks. Despite the fact that crsctl query css votedisk reports zero vote disks in use, Oracle Clusterware remembers the fact that Oracle ASM was in use and the replace verb is required. Only after you use the replace verb to move voting disks back to non-Oracle ASM storage are the verbs add css votedisk and delete css votedisk again usable.

同时，默认情况下，备份OCR时会自动一起备份voting disk。

In Oracle Clusterware 11g release 2 (11.2), you no longer have to back up the voting disk. The voting disk data is automatically backed up in OCR as part of any configuration change and is automatically restored to any voting disk added.