HP Hitachi Dynamic Link Manager Software - Manual (Page 287)

3. Creating an HDLM Environment
263
3.14 Settings for Oracle RAC
The following are notes on using Oracle RAC:
„ When you use Oracle Cluster file System in an Oracle RAC environment, set
0
to
the
comm_voting
parameter in the
/etc/ocfs.conf
file.
„ When you use Oracle Cluster file System 2 in an Oracle RAC environment, set
the
O2CB_HEARTBEAT_THRESHOLD
parameter in the
/etc/sysconfig/o2cbf
file to the following value:
• If the Lightning 9900 series, Lightning 9900V Series, Hitachi USP,
Universal Storage Platform V/VM or Virtual Storage Platform is being used:
(number-of-paths-connected-to-Oracle-Cluster-file-System-2
x 60 seconds /
2) + 1
• If the Thunder 9500V Series or the Hitachi AMS2000/AMS/WMS/SMS
series is being used:
(number-of-paths-connected-to-Oracle-Cluster-file-System-2
x 30 seconds /
2) + 1
„ When a host and an Oracle RAC voting disk are connected by multiple paths,
HDLM performs failover processing for those paths (in the same way as for
normal paths) when an I/O timeout occurs for one of the paths.
Note that, depending on the settings of Oracle RAC, Oracle RAC might determine
that a node error has occurred before the failover processing performed by HDLM
is completed, and then re-configure the cluster.
Therefore, when HDLM manages the paths that are connected to an Oracle RAC
voting disk, change the following settings according to your version of Oracle
RAC:
• When using Oracle RAC 10g 10.1.0.3.0 or later or Oracle RAC 11g:
Change the value of
MISSCOUNT
to match the type of storage system. To do
so, use the following table to obtain the value to be specified, and then
change the current value to a value equal to or greater than the value you have
obtained.