Re: Exadata Cacheflash Compression
- From: Carol Dacko <dackoc@xxxxxxxxx>
- To: George.Leonard@xxxxxxxxx
- Date: Fri, 9 May 2014 08:35:58 -0400
Hi George,
From Exadata 11.2.3.3.0 release and patch (16278923) (Doc ID 1487339.1),
Exadata flash cache compression is now available on X3 and later storage
server releases. It also gives the instructions on how to enable it. And
yes, you get double the space with the implementation of the compression.
Hope this helps!
Carol Dacko
Enkitec
On Fri, May 9, 2014 at 5:29 AM, George Leonard - Business Connexion <
George.Leonard@xxxxxxxxx> wrote:
> Hi Craig
>
> You say with X4... is this not a way of behaviour thats associated more
> with a SW release number, compared to a HW model/range?
>
>
>
> Yours Sincerely
>
> ________________________________________
> *George Leonard*
> *Oracle Engineered System Specialist*
>
> Mobile: +27.82 655 2466
> eMail: george.leonard@xxxxxxxxx <george.leonard@xxxxxxxxxx>
> Web: http://www.bcx.com <george.leonard@xxxxxxxxxx>
>
>
> On 08 May 2014, at 5:26 PM, Craig Dickman <dmarc-noreply@xxxxxxxxxxxxx>
> wrote:
>
> Here's how I understand it. The data in flashcache is compressed by
> default anyway, it happens automatically. Prior to X4, the data in the
> flashcache would get compressed but the extra space made available by this
> compression was not usable.
>
> With the release of X4, Oracle gives you the ability to enable
> flashcache compression which essentially gives you the ability to use the
> space freed up by the automatic flashcache compression. Basically, you
> turn 20TB of flash cache into 40TB usable if you have Advanced Compression.
>
>
> ------------------------------
> *From:* Thomas P S <dmarc-noreply@xxxxxxxxxxxxx>
> *To:* ORACLE- L <oracle-l@xxxxxxxxxxxxx>; Roy <royxavier@xxxxxxxxx>
> *Sent:* Thursday, May 8, 2014 6:29 AM
> *Subject:* Exadata Cacheflash Compression
>
> Dear List,
>
> We have X4-2 Half Rack with 20TB flash cache with database size 8TB. I
> am very reluctant to enable flashcache compression as the size of the
> database is half of flashcache, but Oracle says enabling flashcache
> compression is a best practice. Every code execution need time, even
> though FC is implemented in hardware level compression, still I believe,
> there will be a penalty. In this scenario, enabling flashcache compression
> is a wise idea? Any one got falshcache I/O performance test results with
> compression and with out?
>
> Note: License is not an issue as we have Advanced Compression license.
>
> Thanks in advance,
> Thomas Saviour
>
>
>
>
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