Strange mount/unmount diskgroup

  • From: Mladen Gogala <mgogala@xxxxxxxxxxx>
  • To: Oracle-L Freelists <oracle-l@xxxxxxxxxxxxx>
  • Date: Sun, 18 Feb 2007 17:57:57 -0500

I have a RAC database with a standby. Both RAC and standby are on ASM. On standby, I used the flashback recovery area located on the DGFRA diskgroup to create standby redo 

logs. There aren't any problems but I am perplexed by entries like this:
RFS[1]: Successfully opened standby log 30: '+DGFRA/adprd/onlinelog/group_30.265.614877861' 
SUCCESS: diskgroup DGFRA was dismounted
SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted
Sun Feb 18 17:51:50 2007
SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted
SUCCESS: diskgroup DGFRA was mounted
SUCCESS: diskgroup DGFRA was dismounted
Sun Feb 18 17:51:52 2007
Media Recovery Log /BACKUP/archives/archADPRD_1_514_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_1_515_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_2_863_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_1_516_614435904.dbf
Media Recovery Log /BACKUP/archives/archADPRD_2_864_614435904.dbf
Media Recovery Waiting for thread 1 sequence 517
Why in the world is it unmounting/mounting the diskgroup? What useful purpose does it serve and why 
doesn't the instance just leave it mounted?
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