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Operating Systems
HP-UX
MC ServiceGaurd
Post 4927 by alwayslearningunix on Friday 3rd of August 2001 05:23:39 PM
08-03-2001
MC ServiceGuard is still at the forefront of HP-UX's high availability software, it has been developed to the point where (providing hardware behaves itself) it can provide 99.999% availability when spreading a service across two service guarded machines.
It's quite a sophisticated product, providing a double heartbeat between nodes to monitor machine availability in a cluster and has a whole host of cluster wide and node specific configurable parameters - HP's course covers 5 days. It works from the entry level A class server through to the top end Superdome, as well as on workstations (although the reasoning behind it's application there would be somewhat baffling).
The product does not pretend to create fault tolerant machines, I think fault tolerance in the strict sense of the word is something yet to be attained on servers, and the domain of the mainframe - but it does guarantee high availibilty and with most service level agreements providing for scheduled maintenence downtime a high availability cluster that is service guarded can provide a near fault tolerant environment by allowing services to be flipped from node to node as the sectrions of the cluster is worked on for maintenance.
It's a great product, I would recommend learning it. I am on the course next week
Regards.
It's quite a sophisticated product, providing a double heartbeat between nodes to monitor machine availability in a cluster and has a whole host of cluster wide and node specific configurable parameters - HP's course covers 5 days. It works from the entry level A class server through to the top end Superdome, as well as on workstations (although the reasoning behind it's application there would be somewhat baffling).
The product does not pretend to create fault tolerant machines, I think fault tolerance in the strict sense of the word is something yet to be attained on servers, and the domain of the mainframe - but it does guarantee high availibilty and with most service level agreements providing for scheduled maintenence downtime a high availability cluster that is service guarded can provide a near fault tolerant environment by allowing services to be flipped from node to node as the sectrions of the cluster is worked on for maintenance.
It's a great product, I would recommend learning it. I am on the course next week
Regards.
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LEARN ABOUT DEBIAN
crm_node
PACEMAKER(8) System Administration Utilities PACEMAKER(8) NAME
Pacemaker - Part of the Pacemaker cluster resource manager SYNOPSIS
crm_node command [options] DESCRIPTION
crm_node - Tool for displaying low-level node information OPTIONS
-?, --help This text -$, --version Version information -V, --verbose Increase debug output -Q, --quiet Essential output only Stack: -A, --openais Only try connecting to an OpenAIS-based cluster -H, --heartbeat Only try connecting to a Heartbeat-based cluster Commands: -e, --epoch Display the epoch during which this node joined the cluster -q, --quorum Display a 1 if our partition has quorum, 0 if not -l, --list Display all known members (past and present) of this cluster (Not available for heartbeat clusters) -p, --partition Display the members of this partition -i, --cluster-id Display this node's cluster id -R, --remove=value (Advanced, AIS-Only) Remove the (stopped) node with the specified nodeid from the cluster Additional Options: -f, --force AUTHOR
Written by Andrew Beekhof REPORTING BUGS
Report bugs to pacemaker@oss.clusterlabs.org Pacemaker 1.1.7 April 2012 PACEMAKER(8)