Re: Cluster file systems versus raw devices in Oracle RAC
- From: Li-Shan Cheng <exriscer@xxxxxxxxx>
- To: toni_belloni@xxxxxxxxxxxx
- Date: Thu, 29 Dec 2005 10:22:28 +0100
If you are not in rush wait for OCFS v2.0 which should be released quite
soon.
Not long ago I heard the current OCFS is not a true cluster aware filesystem
but the new version will be
Regards
--
LSC
On 12/26/05, Antonio Belloni <toni_belloni@xxxxxxxxxxxx> wrote:
>
> Hi,
>
> Does anyone using cluster file systems in a RAC 10gR2
> installation, specifically IBM's GPFS?
>
> I've visited a company that is running RAC 10gR2 in
> AIX over raw devices. Why someone would choose to use
> raw devices , with all the problems to administer ,
> when all the modern file systems are so powerful? Is
> there any issues when using cluster file systems +
> RAC? Is there considerable performance benefits when
> using raw devices with RAC ?
>
> I´ve always used Oracle stand alone instances over
> file systems (since version 7) , and performance was
> always very good. I´ve tested raw devices almost 10
> years ago , and even in that time (the hardware today
> is much better - SAN , 15K rpm disks , huge caches -
> and the file systems software today is much better)
> the cost to administer it does not compensate the
> benefits (only 5% more faster than file systems in
> Oracle 7).
>
> So , as I didn't see a line in the Oracle RAC
> documentation saying that RAC only works over raw
> devices and besides any limitations imposed by RAC ,
> why use raw devices nowadays ?
>
> Regards,
> Antonio Belloni
>
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