How to configure a shared volume with simultaneous read/write access for multiple servers

[Mawuse]

Hi,

Please give me the step by step details on How to configure a shared volume with simultaneous read/write access for multiple servers.

Regards,
Berenger.

[Steven E. Protter]

Shalom,

Not all applications are compatible with this configuration:

http://docs.hp.com/en/B5158-90001/ch05s09.html

http://docs.hp.com/en/T2803-90002/ch03s02.html

http://docs.hp.com/en/B7885-90013/ch02s01.html

http://docs.hp.com/en/B5158-90019/ch07s08.html

With me usually the last link is best.

SEP

[Mawuse]

Thanks very much.
My problem now is that whenever I want to mount the shared volume on the second node, it gives me error. I have to run fsck with full option several times before the shared volume can be mounted from the second node. At times it get mounted with a denied write access.
May be I need a patch or a kernel update module, I don't know.
Please help me.

Regards,
Mawuse

[Duncan Edmonstone]

You asked about a shared *volume*, but your seond reply indicates you meant a shared *filesystem*

You can't do it the way you are currently trying - thats why you're getting FS corruptions - the FS isn't capable of managing distributed locking and managing writes from the 2 hosts simultaneoulsy etc.

You hvae 2 choices:

1. Use NFS - create the FS on one node and then share it to the other node.

2, Spend a lot of $$$ on the Serviceguard Storage Management Suite for Clustered Filesystems:

http://h71028.www7.hp.com/enterprise/cache/262609-0-0-0-121.html

HTH

Duncan

[Mawuse]

Hi,

Thanks very much for your contribution.
I strongly believe your message, but a " mounted shared file system with simultaneous read/write from both nodes" seems to be a requirement for installing Oracle Real Application Cluster with CRS ( Cluster ready service ) option.
I may still need more clarification on the requirement for Oracle RAC CRS.
Please, I need further help.

Regards,
Mawuse

[Patrick Wallek]

For Oracle RAC I believe your primary choices are to use Oracle's filesystem or raw devices.

[Mawuse]

Hi,

Thanks a lot for your contribution.
Can you please tell me then the differences between the two options: oracle cluster file system and raw partitions ?
Which option would you prefer ?

Thanks for your attention.

Regards,
Berenger

[Morcos]

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What I know is you can't install oracle cluster file system on hp-ux, you can use it on linux but not hp-ux.

raw partitions: you are using the rlvol of a volume group, not a file system.

If you want to use a shared file system and pay $$ you can install SFRAC ( storage foundation for oracle RAC, veritas shared file system).

Hope this helps,
Ziad

[Geoff Wild]

You have to use RAW devs controlled by Oracle (which can only be backed up by RMAN) or use Cluster File System in Serviceguard.

Rgds...Geoff