Re: RAC/how should i store oracle files on a SAN

"DA Morgan" <damorgan_at_psoug.org> wrote in message news:1122953947.776480_at_yasure...
> Andreas Sheriff wrote:
>> "Moe" <mwahidi_at_emanagelaw.com> wrote in message
>> news:1122922686.586023.163080_at_g14g2000cwa.googlegroups.com...
>>
>>>The thing is that my SAN already have RAID and RAID 10, so do you
>>>think it's ok if i have ASM on top of the RAID?.
>>>Im thinking of going with raw for the two CRS files and ASM for the
>>>rest.
>>>
>>>Thanks
>>>
>>>Moe
>>>
>>
>>
>> Aren't ASM and raid redundant?
>>
>> Hardware based RAID's are ALWAYS better than software based RAID's
>> because
>> the hardware based RAID has its own CPU.
>
> Redundant? Not at all. It is important to remember that ASM does a lot
> more than a simple LVM (Logical Volume Manager). Sure ASM creates disk
> groups and failover groups but it also load balances when you add and
> remove disks. RAID isn't going to do that.
>
> ASM will also let you move from one array to another by sequentially
> adding disk from one and subtracting from the other. RAID won't do that
> either.
> --
> Daniel A. Morgan
> http://www.psoug.org
> damorgan_at_x.washington.edu
> (replace x with u to respond)

Daniel,

If you are presenting the SAN volume to the server as 1 LUN, so for example in AIX, 1 hdisk device, will ASM still be able to do any load balancing ?

Matthias Received on Tue Aug 02 2005 - 03:24:47 CDT