08-11-2010
HA Cluster solution for Linux - which one to use?
Hi all experts,
I need your kind suggestions or feedback on choice of clustering software for red hat linux nodes running certain applications which I need to make highly available.
Minimum requirement is 2 nodes; all nodes shall be active-active running distinct applications e.g. node 1 runs application ABC and node 2 runs application PQR, node 1 is back up node for PQR and node 2 for ABC. Node 1 and node 2 do not have any shared storage required, they access back end database which is protected by Oracle's dataguard.
I need to have cost-effective HA with minimum downtime. There are various HA solutions available in market - SteelEye, Veritas Cluster, Red Hat cluster suite, IBM HACMP etc. and I have almost narrowed down to Red Hat Cluster(for it being cheaper) vs Veritas (for it being feature rich).
Any experiences with clustering? Any pros and cons of these two cluster software (with references would be appreciated) would be of great help?
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LEARN ABOUT DEBIAN
o2cb_ctl
o2cb_ctl(8) OCFS2 Manual Pages o2cb_ctl(8)
NAME
o2cb_ctl - Control program for the O2CB cluster service.
SYNOPSIS
o2cb_ctl -C -n object -t type [-i] [-a attribute ]
o2cb_ctl -D -n object [-u]
o2cb_ctl -I [-o-z] -l manager> [-n object>] [-t type] [-a attribute]
o2cb_ctl -H [-n object] [-t type>] [-a attribute>]
o2cb_ctl -h
o2cb_ctl -V
DESCRIPTION
o2cb_ctl is the control program for the O2CB cluster service. Users are not advised to use this program directly but instead use the O2CB
init service and/or ocfs2console.
OPTIONS
-C Create an object in the OCFS2 Cluster Configuration.
-D Delete an object from the existing OCFS2 Cluster Configuration.
-I Print information about the OCFS2 Cluster Configuration.
-H Change an object or objects in the existing OCFS2 Cluster Configuration.
-h Displays help and exit.
-V Print version and exit.
OTHER OPTIONS
-a <attribute>
With -C, <attribute> is in format "parameter=value", where the parameter is a valid parameter that can be set in the file
/etc/ocfs2/cluster.conf. With -I, <attribute> may be "parameter", indicating an attribute to be listed in the output, or it may be
"parameter==value", indicating that only objects matching "parameter=value" are to be displayed.
-i Valid only with -C. When creating something (node or cluster), it will also install it in the live cluster. If the parameter is not
specified, then only update the /etc/ocfs2/cluster.conf.
-n object
object is usually the node name or cluster name. In the /etc/ocfs2/cluster.conf file, it would be the value of the name parameter
for any of the sections (cluster or node).
-o Valid only with -I. Using this parameter, if one asks o2cb_ctl to list all nodes, it will output it in a format suitable for shell
parsing.
-t type
type can be cluster, node or heartbeat.
-u Valid only with -D. When deleting something (node or cluster), it will also remove it from the live cluster. If the parameter is not
specified, then only update the /etc/ocfs2/cluster.conf.
-z Valid only with -I. This is the default. If one asks o2cb_ctl to list all nodes, it will give a verbose listing.
EXAMPLES
Add node5 to an offline cluster:
$ o2cb_ctl -C -n node5 -t node -a number=5
-a ip_address=192.168.0.5 -a ip_port=7777
-a cluster=mycluster
Add node10 to an online cluster:
$ o2cb_ctl -C -i -n node10 -t node -a number=10
-a ip_address=192.168.1.10 -a ip_port=7777
-a cluster=mycluster
Note the -i argument.
Query the IP address of node5:
$ o2cb_ctl -I -n node5 -a ip_address
Change the IP address of node5:
$ o2cb_ctl -H -n node5 -a ip_address=192.168.1.5
SEE ALSO
mkfs.ocfs2(8) fsck.ocfs2(8) tunefs.ocfs2(8) mounted.ocfs2(8) ocfs2console(8) o2cb(7)
AUTHORS
Oracle Corporation
COPYRIGHT
Copyright (C) 2004, 2010 Oracle. All rights reserved.
Version 1.6.4 September 2010 o2cb_ctl(8)