Re: Strange mount/unmount diskgroup

Mladen,

Ignore the messages. They are just informal ones and will be removed from future(!)versions. Basically ASM close (or dismount) those groups when it closes the file descriptors on that DG and mounts when it opens first file on that DG.

-Gopal

On 2/18/07, Mladen Gogala <mgogala_at_vmsinfo.com> wrote:
> 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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>
>
>

-- 
Best Regards,
K Gopalakrishnan
Co-Author: Oracle Wait Interface, Oracle Press 2004
http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

Author: Oracle Database 10g RAC Handbook, Oracle Press 2006
http://www.amazon.com/gp/product/007146509X/
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