From: Green, Simon (SGreen@KRAFTEUROPE.COM)
Date: Mon Sep 30 2002 - 10:57:55 EDT
It's not technically difficult to set up concurrent access; what's difficult
is managing the locking. That's usually an application issue, not something
you could handle simply within the operating system. (I confess I haven't
had much experience with this since my MVS days, but the principles and
problems are the same whatever the platform.)
I'm not sure of the relevance, anyway: how does a single archive filesystem
make things easier than one for each instance?
Since Oracle has a facility to write to a remote server, I'd use that. It
could also address a Disaster Recovery issue, ensuring you're able to
recover recent data. (Remember that if you're archiving to tape, unless
that tape is at a remote site you should assume it's lost with the rest of
the site when the meteorite hits.) Usually better to go with standard
features as well, rather than invent your own.
Simon Green
Philip Morris ITSC Europe
AIX-L Archive at http://marc.theaimsgroup.com/?l=aix-l&r=1&w=2
AIX FAQ at http://www.faqs.org/faqs/aix-faq/
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> -----Original Message-----
> From: B.N.Sarma [mailto:bsarma@BASIT.COM]
> Sent: 30 September 2002 15:30
> To: aix-l@Princeton.EDU
> Subject: HACMP Cluster and Shared File System
>
>
> Greetings,
>
> We have IBM RS6000 AIX 4.3.3 and 2 node HACMP/ES cluster
> running oracle
> 8.1.7 OPS.
>
> I have setup the oracle database on raw devices, every thing
> is fine. I
> wanted to setup a shared file system for archived redo logs , where
> oracle instance from both the nodes can archive the redo logs to one
> shared file system.
> This (shared FS) facilitates easier backups and recovery in case of
> oracle database (instance) crash.
>
> But we were informed by IBM Tech support that it is not possible to
> setup a shared file system where we can read, write
> simultaneously from
> both the nodes. Does HANFS need separate license or is it a different
> product.
>
> I was looking at the HACMP documentation, there they talk about HANFS
> again which is limited to 2 nodes, of course it works for us.
> But I want to know the pros and cons of going for such a setup. Oracle
> 817 offers writing a copy of the archived logs to remote servers.
>
> I want to weigh both the features.
>
> I appreciate your suggestions and comments.
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