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Re: AIX GPFS to Raw Devices

From: Alex Gorbachev <>
Date: Tue, 20 Feb 2007 23:56:04 -0500
Message-ID: <>

With RMAN - you can simply backup your database and then restore+recover. two options:
- before restore/recover do set new name to rename datafiles - move your datafiles somewhere or rename or unmount the FS (just in case don't delete them) and create links to raw devices in as they were with FS.

controlfiles - restore from RMAN backup (or any other backup). Change your init.ora or replace old controlfile with links to raw devices. I wouldn't remove controlfiles - copy or move somewhere. like "RESTORE CONTROLFILE FROM <old controlfile>;"

redo logs - those are better change online create new groups and drop old ones.

You might want to put spfile on raw device as well.

Note that you can usually move all files using dd but Oracle (I think depending on the platform) skips the first block to avoid overwriting disk label on some OS's. I think it's mentioned on Metalink somewhere.

Approach with RMAN will also serve as a good test of your backup strategy - don't take specific backup - use your existing one.

On 2/20/07, Fuad Arshad <> wrote:
> We did a similar move but the opposite direction using rman. it woked
> beautifully.
> i did do test my back out plan but moving the datafiles back to raw and it
> worked too.
> this was a non rac instance and i dont think that will matter
> just use the datafilecopy of rman
> and then alter database datafile to rename the datafiles in the database.
> ----- Original Message ----
> Sent: Tuesday, February 20, 2007 11:34:19 AM
> Subject: AIX GPFS to Raw Devices
> Our O/S team is looking to move our file system from current GPFS 2.3
> to a file system
> of Raw Devices. AIX 5.2 and Oracle 9206. We have disabled RAC and are
> in the
> process of relinking the libraries with RAC off, although once we
> migrate to 10g, we
> will enable RAC again. Is this O/S file system move doable and what
> are some
> of my concerns from the Oracle standpoint?
> What should we be aware of? Do I have to export/import database or can
> we move
> files at O/S level? Are there any best practice papers for this? I
> have not used Raw
> Devices w/oracle...are there papers for running Oracle on Raw Devices?
> I've found
> no information on Metalink, but I have opened an SR.
> Any thoughts, comments appreciated. Thanks.
> --

Best regards,
Alex Gorbachev
Received on Tue Feb 20 2007 - 22:56:04 CST

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