Hitachi Dynamic Link Manager Software Users Guide for Linux

(number-of-paths-connected-to-Oracle-Cluster-file-System-2 x 60
seconds / 2) + 1
¢
If the Thunder 9500V series, Hitachi AMS2000/AMS/WMS/SMS series
or HUS100 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.
Table 3-75 Formula for Calculating MISSCOUNT
Storage system type
Formula for obtaining the value of
MISSCOUNT
• Lightning 9900V series
• Hitachi USP series
• Universal Storage
Platform V/VM series
• Virtual Storage Platform
series
• VSP G1000 series
• HUS VM
number-of-paths-connected-to-the-voting-disk
x 60 seconds
• Hitachi
AMS2000/AMS/WMS/SMS
series
• HUS100 series
• Thunder 9500V series
number-of-paths-connected-to-the-voting-disk
x 30 seconds
¢
When using Oracle RAC 10g 10.2.0.2.0 or later or Oracle RAC 11g:
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.
3-184
Creating an HDLM Environment
Hitachi Dynamic Link Manager (for Linux®) User Guide