[CentOS] HP ILO Fence Configuration
John R Pierce
pierce at hogranch.com
Tue Aug 5 21:45:35 UTC 2008
> What about configuring a cluster without fencing? is it possible? I am
> about to create a cluster but with out fencing device.
Generally its dangerous. if the servers get out of sync and both try
to mount a shared resource, you can end up with corrupted file
systems. since the primary goal of a high availability cluster is,
well, high availability, and increased overall system reliability, these
clusters have to be constructed very carefully or they can cause more
problems than they solve.
what sort of shared resources will this HA cluster have? how is the
shared storage connected ? if its via a iSCSI SAN, you can implement
fencing via either the ethernet switch (tell the switch to drop the
standby server from the iscsi vlan), or via the storage controller (tell
the iscsi target host to disallow LUN access by the current standby
server). If its a fiberchannel SAN you can fence via the SAN switch.
More information about the CentOS