Skip to Content
0
Former Member
Apr 13, 2015 at 12:19 PM

Oracle RAC 11.2.0.3 on ASM system copy with brrecover

137 Views

Dear all,

Apologies for the lengthy message

I am preparing to create a new experimental PI 7.3 system called PIX as a copy of the already existing PI Development system PID. The database of the source system is Oracle 11.2.0.3 on Oracle RAC and ASM. I plan to be using the database specific method for the system copy.


Because of Oracle RAC and ASM, the backup in the source system is taken with brbackup calling RMAN and the restore in the target system has to happen with RMAN. I will be restoring from an full offline RMAN backup.


I am trying to put together a plan as the documentation from SAP when it comes to restoring on ASM with RMAN is scattered in many different places and not detailed enough.

The ASM disk groups in the target system differ to the ones in the source system. For example, the source system diskgroup contains the <SID> as well, so +PID_DATA while the target system diskgroup for data is called +DATA


I read that I should run brrecover in order to restore with RMAN on ASM. For that, the target database should bein mount state when brrecover runs against it.


So I understand that I have to run brrestore -d rman_util -b last -m 0,00 to restore the source controlfile in thetarget system together with the source online redo logs.

My first question is how the controlfile and online redo logs will be stored. brrestore will look to restore them in an ASM diskgroup in the target system that does not exist. They have been backed up as (example)

+PID_MLOG/pid/onlinelog/group_1.256.783443785
+PID_OLOG/pid/onlinelog/group_1.256.783443785
+PID_DATA/PID/cntrlPID.dbf
+PID_ARCH/PID/cntrlPID.dbf
+PID_RECO/PID/cntrlPID.dbf

but the target system only has disk groups +DATA, +ARCH,+RECO


The three controlfiles will need to go to one of +DATA, +ARCH,+RECO each and the PID_OLOG to +DATA and the PID_MLOG to +RECO.


Then, I will have to start the database in mount state. As there is nothing with the target system name PIX in the restored controlfile, I assume that I will have to set the environment of Unix user oracle to point to the source system PID (ORACLE_HOME,ORACLE_SID, SAPDATA_HOME) and start the database mount as if it was a PID database. Is that correct?


Then set the ORACLE_HOME, ORACLE_SID etc point to target system name PIX values and finally, following the
instructions from note 1003028

brrecover -t reset -b last -f PIX -RDG


The -RDG option will activate special parameter _remap_disk_groups which will need to be set to something like this: _remap_disk_groups=(+PID_DATA,+DATA,+PID_OLOG,+DATA,+PID_MLOG,+RECO,+PID_ARCH,+ARCH,+PID_RECO,+RECO)


Note 1003028 does not say where this parameter is set. Is it an Oracle parameter to be set in the spfile ora parameter of brrecover set in the menus? Or somewhere else?

Many thanks for your help

Andreas