I read ... to improve skills and ideas on Oracle database 11g RAC Administration presentation.
I found... many things different idea 10gR2 RAC.
About "Back Up and Recover Your Voting Disks"...
That's sure we can backup by "dd" command ("ocopy" on windows)... & the block size for the dd command should be at least 4 KB and it's recommended to use symbolic links.
When Read... more! I found something different.
On 10gR2 RAC used "Can be done online" words ;)
A backup taken via the dd command can be a hot backup, which means that the Oracle Clusterware daemons do not need to be stopped in order to take this backup.
On 11g RAC used "Cannot be done online" words ;)
Before backing up your voting disk with the dd command, make sure that you stopped Oracle Clusterware on all nodes.
I don't know yet... why? or just recommend... But one thing, after install oracle clusterware, add node or delete node...on 11g RAC.
I won't forgot to backup voting disk. Cuz, I don't want to stop all nodes ;)