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HP Hitachi Dynamic Link Manager Software User Manual

Page 182

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3. Creating an HDLM Environment

160

3.12 Settings for Using Oracle RAC 10g or Oracle RAC 11g

3.12.1 Settings for MISSCOUNT and DISKTIMEOUT

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 3-24: Formula for Calculating MISSCOUNT

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.

Storage system type

Formula for obtaining the value of MISSCOUNT

Hitachi AMS2000/AMS/WMS/SMS

series

Thunder 9500V series

number-of-paths-connected-to-the-voting-disk

x

30 seconds

Hitachi USP
Lightning 9900V series
Universal Storage Platform V/VM
Virtual Storage Platform

number-of-paths-connected-to-the-voting-disk

x

60 seconds