GregG wrote:Yes..backup is necessary to prevent data loss. To change compatibilty parameter the all files on that diskgroup must be closed (i.e database down), but diskgroup must be mounted, so downtime is necessary.
Thank You, thats clear :) .
If I understood You correctly normaly, changing compatibility asm parameter to higher value is safe (no data loss), so backup is for safety reasons, right ?
I'm prepering my 10.2 -> 11.2 RAC upgrade and as a step I'll mount 10.2 ASM diskgroup in ASM 11.2 instance :) .