Re: RAC -- RAW Device Multipath (Shared Storage)

CCing the list just in case someone finds it useful.

On one node run:
echo LUN01 | dd of=/dev/emcpowera bs=5 count=1 echo LUN02 | dd of=/dev/emcpowerb bs=5 count=1 ...

So you associate emcpowera with LUN1, emcpowerb with LUN2 and etc. On other nodes you read from every LUN:
dd if=/dev/emcpowera bs=5 count=1 2>/dev/null ; echo dd if=/dev/emcpowerb bs=5 count=1 2>/dev/null ; echo ...

This will help you to determine what is what and it's independent of which multipathing (if any) you use.

Of course, another way is to get your System/Storage Admin to tell you but if you don't want to loose time or they can't be bothered or don't know or whatsover, you have this option.

On 8/29/07, Ravi Gaur <ravigaur1_at_gmail.com> wrote:
> Alex,
> Can you provide an example on the dd command to check on the mappings? That
> will be very helpful.

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Alex Gorbachev, Oracle DBA Brewer, The Pythian Group
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