topic Re: cannot write to shared volume group in Operating System - HP-UX

cannot write to shared volume group

Mawuse — Wed, 18 Oct 2006 11:10:07 GMT

Hi,

Two nodes cluster are sharing the same virtual disk on an EVA 4000. I could mount the shared space on both nodes. The vgdisplay even shows " sharable; Read/Write; client" on the second node. Despite all these I cannot write to the file sytem; cannot create touch.

Please help. Your contributions are welcomed.

Regards,
Mawuse

Re: cannot write to shared volume group

A. Clay Stephenson — Wed, 18 Oct 2006 11:14:44 GMT

Stop. Go directly to jail. Do not pass Go. Do not collect $200.00. The ONLY was you are allowed to mount multiple filesystems read-write is if you are running the Cluster File System which is only available on 11.23 and up. Being able to activate the VG in shared modes says absolutely nothing about the filesystems' ability to handle this. The problem (unless you are running CFS) is buffer-cache consistancy. Server B won't have a clue about Server A's buffer contents and absolute chaos is guaranteed.

Re: cannot write to shared volume group

Denver Osborn — Wed, 18 Oct 2006 11:16:29 GMT

Is it possible that you have that LUN write disabled for that host?

-denver

Re: cannot write to shared volume group

Denver Osborn — Wed, 18 Oct 2006 11:18:19 GMT

d'oh. thanks Clay, missed hist point about "I could mount..." So no raw device here.

Re: cannot write to shared volume group

Mawuse — Wed, 18 Oct 2006 11:46:50 GMT

Thanks for your prompt contributions.

Can you please advise on the following :

I am currently installing Oracle cluster Ready Service:

Specification:

1- Configuration of two RAC clusters ( 2 nodes each ) for ERP
2- LVM configuration of raw volumes for clustered databases
3- HP SGeRAC 11.16 clusters implementation
4- Installation and configuration of Oracle 10g CRS + Oracle 10g RAC binaries + patch 10.1.0.4
5- Creation of two databases
6- Integration of One Oracle database into the SGeRAC clusters

Questions

1- I use to configure Oracle Database package with HP Service Guard for automatic switch over . Now this is the case where by Oracle Real Application Cluster has to be configured. I don' t really know whether I have to configure package or packages.

2- It seems I don't really understand the customer specification.

3- Is it possible to configure a shared virtual disk on an EVA 4000 for simultaneous access from cluster nodes, in such a way that both nodes can have the shared storage file system mounted at the same time ?

Please enlighten me. Your contributions and clarification are welcomed.

Regards,
Mawuse