From: Ferenc Gyurcsan (fgyurcsa@AVAILANT.COM)
Date: Mon Sep 30 2002 - 11:22:09 EDT
AFAIK, HANFS has been integrated into the HACMP and HAES product line. The
functionality that came with it is supported only on two-node clusters (NFS
locking, but I'm not real familiar with that functionality, but I know it
will not work if you have more than two nodes. There are certain calls that
are made if you have two nodes.).
I don't know how Oracle logs, but you could either:
-get the logging mechanism to log to a remote node (in which case the
logging facility will handle the "concurrent" access, but you have to make
it highly available (which shouldn't be hard with a non-concurrent resource
group),
-or you could use NFS, and then one of the nodes has the fs mounted, and the
other one crossmounts it, and then you still have to make sure that they
don't want to write to the same file.
-Or you could code something that will use HACMP's lock manager for locking,
but this could get hard real quick.
--Ferenc
-----Original Message-----
From: B.N.Sarma [mailto:bsarma@BASIT.COM]
Sent: Monday, September 30, 2002 10:30 AM
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.
Regards & Thanks
BN
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