Re: ASM Record Deletions

  • From: "Alex Gorbachev" <gorbyx@xxxxxxxxx>
  • To: smishra_97@xxxxxxxxx
  • Date: Thu, 15 Jun 2006 21:46:23 +0200

ASM will see all disks that match asm_disk_string init.ora parameter
of ASM. On all nodes.  So you can use this parameter to control which
disks every node sees.

Now, you can mount or unmoung diskgroup using ALTER DISKGROUP <dg>
MOUNT/DISMOUNT;

ASM_DISKGROUPS init.ora parameter controls which disk groups are
mounted at startup. It also used to mount umount disks using ALTER
DISKGROUP ALL MOUNT/DISMOUNT.

Note that ALTER DISKGROUP <dg> MOUNT/DISMOUNT with specific diskgroup
name modifies this parameter in spfile if you have one.

Now regarding CSS. In my understanding it has nothing to do with
association of diskgroup to ASM instance. As I mentioned this is
controlled by you or ASM instance at startup base on init.ora
parameter ASM_DISKGROUPS. What CSS is tracking is association between
database instance and ASM instance that it's connected to.

If you have the link to the presentation - please share. I would like
to see it - maybe my understanding is incorrect.

2006/6/15, Sanjay Mishra <smishra_97@xxxxxxxxx>:

Kevin

If I have 3 Node RAC and is it possible that I can have 2 node using DG1 and
DG2  disk group while third node can have three Disk group DG1, DG2 and DG3.
Actually I want to use node 3 for one different application comparision to
Node1 and Node2 and so want to use seprate Disk group.

I was in IOUG and have seen one presentation where they have shown it. They
also mention that group services maintainted the DG+asm mapping. I know CSS
is maintaining this information but is it possible to check the group
services information outside of Database.

TIA

Sanjay




Kevin Closson <kevinc@xxxxxxxxxxxxx> wrote:

no problem...just the tip of the ASM misunderstanding iceburg
out there...and that is no reflection on you...it is rampant



 ________________________________
 From: Sanjay Mishra [mailto:smishra_97@xxxxxxxxx]
Sent: Tuesday, June 13, 2006 5:49 PM
To: kevinc@xxxxxxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Subject: RE: ASM Record Deletions



Thanks Kevin for nice catch

.com


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Best regards,
Alex Gorbachev

http://blog.oracloid.com
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