Oracle on RHEL4 with ASM problem

[Lunt, Nick]

Hi Jack,

> -----Original Message-----
> From: Jack Challen [mailto:jack_challen at ocsl.co.uk]
> Sent: 08 May 2006 10:23
> To: General Red Hat Linux discussion list
> Subject: Re: Oracle on RHEL4 with ASM problem
> 
> 
> 
> Lunt, Nick wrote:
>  > Hi Jack, does the info above give you what your looking for ?
> 
> Gets me closer, yes.
> 
> You have:
> 
> RX4640s, which are single-attached to a SAN with an EVA6000 by QLogic 
> cards. Therefore, you're not doing failover between any HBAs 
> - correct?

Correct.

> 
> I'm assuming that any single LUN presented by the EVA is seen 
> twice by 
> the HBAs (at some level, but the driver-provided multipathing 
> might hide 
> it) - correct?

Yes. Each LUN is seen twice but the multipathing hides it so we only see one device for each LUN.

> You have (presumably) set up the LUNs as raw devices (ie not 
> block) to 
> allow ASM to interact correctly with them - correct?

No. I partitionied the LUNs as type Linux, so /dev/sdc became /dev/sdc1 when presented to the box for ASM.
I did not put a filesystem on the LUNs however.
I originally did not partition them but the DBA's told me ASM would not accept them when they tried to add them in.

> You've set the "Host type" of the RX boxes to be "Linux" from within 
> Command View - correct? (yes, basic, I know ;-) )

Yes ;)

> Can you also try presenting another LUN to these systems, leaving it 
> unmanaged by ASM (e.g, create a filesystem on it, mount it), 
> to see if 
> it remains accessible after ASM falls over?

These machines already have LUN's attached for other filesystems not in ASM, eg /opt/oracle, /opt/Tivoli etc.
When ASM fails the rest of the filesystems are fine.

Cheers,
Nick . 

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