Re: Cluster file systems versus raw devices in Oracle RAC

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  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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