Re: [Exadata] How do you use FlashDisk ?

From: Greg Rahn <greg_at_structureddata.org>
Date: Sat, 19 Mar 2011 11:01:41 -0700
Message-ID: <AANLkTin7vsEURJnBs45aHwtEogF9ngGbnWWKQxPD6Mm0_at_mail.gmail.com>

"It is a common misconception that Oracle online redo logs will benefit by moving them on EFDs, whereas all the experimental data indicates the opposite position"
page 17
http://www.emc.com/collateral/hardware/white-papers/h5967-leveraging-clariion-cx4-oracle-deploy-wp.pdf

On Sat, Mar 19, 2011 at 10:53 AM, Jared Still <jkstill_at_gmail.com> wrote:
>
>
> On Sat, Mar 19, 2011 at 6:58 AM, Robert Freeman <robertgfreeman_at_yahoo.com>
> wrote:
>>
>> Flash disks for WRITE operations are actually not that fast. I don't have
>> the performance numbers here, but you really don't buy anything in terms of
>> write performance with flash disks. So I would not recommend them for a disk
>> group that will contain, say, online redo logs.
>
> Interesting observation Robert.
> From the two guys at LSI that test flash memory with Oracle:
> "Online redo logs are best handled by Hard Disk Drives because of the
> sequential writes"

-- 
Regards,
Greg Rahn
http://structureddata.org
--
http://www.freelists.org/webpage/oracle-l

Received on Sat Mar 19 2011 - 13:01:41 CDT