05-07-2008
Lots of stuff to think about!
You need to think about the reasons for running RAC. Is it to overcome downtime due to scheduled server outages? Or for high availability (ie 24x7 or as close as possible)? Are you trying for a 2-site cluster (much harder to administer and set up)?
Anyway you need a way to get to the data which is shared between the cluster nodes, raw disk or a clustered filesystem or NFS- you can use ASM (raw disk shared across cluster ie all backups via Oracle) or GPFS (filesystem shared across cluster, backups via Oracle interacting with backup s/w such as TSM). Both supported with AIX. Also you can look at HACMP shared raw LVs (not v popular these days) or a NAS (though then access to DB is via NFS).
You will need to consider what happens in the different failure scenarios. Especially for 2-site scenario, as you will likely find you will need 3 sites (3rd site is a voting site).
There are documents available with examples for setting up RAC and GPFS from the IBM Oracle Competency Centre. Contact oraclibm fr ibm com for the "Oracle 10g RAC cookbook on IBM pseries running AIX".
Then you can start thinking about tuning as well!
Don't forget about having enough capacity available in case one server is unavailable for a long time.
For availability you will need to consider lots of other stuff to reduce outages (e.g. AIX multibos)
Luck!
Last edited by indulis; 05-07-2008 at 08:44 AM..
Reason: correction
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LEARN ABOUT SUSE
mount.ocfs2
mount.ocfs2(8) OCFS2 Manual Pages mount.ocfs2(8)
NAME
mount.ocfs2 - mount an OCFS2 filesystem
SYNOPSIS
mount.ocfs2 [-vn] [-o options] device dir
DESCRIPTION
mount.ocfs2 mounts an OCFS2 filesystem at dir. It is usually invoked indirectly by the mount(8) command when using the -t ocfs2 option.
OPTIONS
_netdev
The filesystem resides on a device that requires network access (used to prevent the system from attempting to mount these filesys-
tems until the network has been enabled on the system). mount.ocfs2 transparently appends this option during mount. However, users
mounting the volume via /etc/fstab must explicitly specify this mount option to delay the system from mounting the volume until
after the network has been enabled.
atime_quantum=nrsec
The file system will not update atime unless this number of seconds has passed since the last update. Set to zero to always update
atime. It defaults to 60 secs.
relatime
The file system only update atime if the previous atime is older than mtime or ctime.
noatime
The file system will not update access time.
acl / noacl
Enables / disables POSIX ACLs (Access Control Lists) support.
user_xattr / nouser_xattr
Enables / disables Extended User Attributes.
commit=nrsec
Sync all data and metadata every nrsec seconds. The default value is 5 seconds. Zero means default.
data=ordered / data=writeback
Specifies the handling of file data during metadata journalling.
ordered
This is the default mode. All data is forced directly out to the main file system prior to its metadata being committed
to the journal.
writeback
Data ordering is not preserved - data may be written into the main file system after its metadata has been committed to
the journal. This is rumored to be the highest-throughput option. While it guarantees internal file system integrity, it
can allow old data to appear in files after a crash and journal recovery.
datavolume
This mount option has been deprecated in OCFS2 1.6. It has been used in the past (OCFS2 1.2 and OCFS2 1.4), to force the Oracle
RDBMS to issue direct IOs to the hosted data files, control files, redo logs, archive logs, voting disk, cluster registry, etc. It
has been deprecated because it is no longer required. Oracle RDBMS users should instead use the init.ora parameter, filesys-
temio_options, to enable direct IOs.
errors=remount-ro / errors=panic
Define the behavior when an error is encountered. (Either remount the file system read-only, or panic and halt the system.) By
default, the file system is remounted read only.
localflocks
This disables cluster-aware flock(2).
intr / nointr
The default is intr that allows signals to interrupt cluster operations. nointr disables signals during cluster operations.
ro Mount the file system read-only.
rw Mount the file system read-write.
SEE ALSO
mkfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) debugfs.ocfs2(8) o2cb(7)
AUTHORS
Oracle Corporation
COPYRIGHT
Copyright (C) 2004, 2010 Oracle. All rights reserved.
Version 1.4.3 February 2010 mount.ocfs2(8)