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SAN migration - would this work? [message #543612]

Wed, 15 February 2012 14:26

n2fontenay
Messages: 15
Registered: December 2011
Location: San Diego, CA

Junior Member

Hi,

We have a RAC in a test environment.
It's 2 nodes connecting to an IBM DS3512.

The DS3512 has one pool of 8 hard disks (RAID10) which has been then sliced into logical drives:

2 x 1GB
then
2 * 400GB

I have been tasked with changing the current configuration as follow:

2 pools of 4HDs in a RAID10 configuration

Then from the first pool:
2 * 1GB
1 * 398GB

from 2nd pool:
1 * 400GB

What I intend to do:

1) shutdown
SQL> shutdown immediate;
./srvctl crs stop

2) backup
dd if=votingdisk of=voting_disk_backup
I already got backups of OCR in $CRS_HOME/cdata/crs/

3) Perform changes on SAN
4) recreate ocfs2 partitions

5) mount the disks to their folder.

6) recovery
recover voting from backup
recover ocr from backup

7) Turn service on again
./srvctl crs start
SQL> startup;

Would this scenario work. There can be some glitches like the disk names changing after the reconfiguration but I only need to modify fstab for that.

Any advices

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Re: SAN migration - would this work? [message #543727 is a reply to message #543612]

Thu, 16 February 2012 10:15

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

>>Would this scenario work
Would.
With ASM, SAN migrations are so simple and could be done online.

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Re: SAN migration - would this work? [message #543730 is a reply to message #543727]

Thu, 16 February 2012 10:18

n2fontenay
Messages: 15
Registered: December 2011
Location: San Diego, CA

Junior Member

Unfortunately, this configuration has no ASM installed.
The data files are in an ocfs2 partition.

Why it's been done like this, I don't know.

Thanks for validating my procedure!

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Re: SAN migration - would this work? [message #543732 is a reply to message #543730]

Thu, 16 February 2012 10:26

Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille

Senior Member
Account Moderator

My ocfs2 experience is much limited. More like playing with it.
Never had a real production database on it.
Your outline seems to be fine, ignoring the nuances and run time issues. I would ask Oracle support.

[Updated on: Thu, 16 February 2012 10:26]

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