Re: [Exadata] How do you use FlashDisk ?
- From: Greg Rahn <greg@xxxxxxxxxxxxxxxxxx>
- To: jkstill@xxxxxxxxx
- Date: Sat, 19 Mar 2011 11:01:41 -0700
"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@xxxxxxxxx> wrote:
>
>
> On Sat, Mar 19, 2011 at 6:58 AM, Robert Freeman <robertgfreeman@xxxxxxxxx>
> 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
--
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