Hitachi XP P9500 User Manual page 92

You must apply MP3 or later.
Note
• When a host and an Oracle RAC 11g 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 11g, Oracle RAC 10g
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 11g voting disk, change settings as described below.
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When Sun Cluster is not used:
Change the value of MISSCOUNT to the following value or greater:
(number-of-paths-connected-to-the-voting-disk x 60 seconds).
If four or more paths are connected to a voting disk, change
DISKTIMEOUT, which is the I/O timeout threshold value for a voting
disk, to the following value or greater: (number-of-paths-connected-
to-the-voting-disk x 60 seconds).
When Sun Cluster is used:
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.
Table 3-13 Formula for Calculating MISSCOUNT
Storage system type
• Lightning 9900 series
• Lightning 9900V series
• Hitachi USP
• Universal Storage
Platform V/VM
• Virtual Storage Platform
• Hitachi AMS2000/AMS/
WMS/SMS series
• Thunder 9500V series
In addition to the value of MISSCOUNT shown above, also change the
value of DISKTIMEOUT. As with MISSCOUNT, the value to be specified in
DISKTIMEOUT is determined by the type of storage system. To make
the change, 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.
Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide (for Solaris(R))
Formula for obtaining the value of
MISSCOUNT
number-of-paths-connected-to-the-voting-disk
x 60 seconds
number-of-paths-connected-to-the-voting-disk
x 30 seconds