HP Hitachi Dynamic Link Manager Software - Manual (Page 87)

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If you are installing HDLM on Windows Server 2008, do not delete the
multi-path I/O feature from the Server Manager.
• When a host is connected to an Oracle RAC voting disk via multiple paths,
if an I/O timeout occurs for any one of these paths, HDLM will perform a
failover.
Note that, depending on the Oracle RAC settings, Oracle RAC might
determine that a node error has occurred before the failover has
completed, upon which it will re-configure the cluster.
If HDLM is managing the paths that are connected to an Oracle RAC
voting disk, change the following settings to be compatible with your
version of Oracle RAC:
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When using Oracle RAC 10g 10.1.0.3.0 or later or Oracle RAC 11g:
Change the value of MISSCOUNT to match the storage system type.
Use the following table to determine a value, and then change the
current value to a value equal to or greater than the value you have
determined.
Table 3-11 Formula for Calculating MISSCOUNT
Storage system type
Formula for obtaining the value of
MISSCOUNT
• Lightning 9900V series
• Lightning 9900 series
• Hitachi USP
• Universal Storage
Platform V/VM
• Virtual Storage Platform
number-of-paths-connected-to-the-voting-disk
x 60 seconds
• Hitachi AMS2000/AMS/
WMS/SMS series
• Thunder 9500V series
number-of-paths-connected-to-the-voting-disk
x 30 seconds
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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 of DISKTIMEOUT
is different for each type of storage system. Use the following table to
determine a value, and then change the current value to a value equal
to or greater than the value you have determined.
Table 3-12 Formula for Calculating DISKTIMEOUT
Storage system type
Number
of paths
connecte
d to the
voting
disk
Formula for obtaining the value
of DISKTIMEOUT
• Lightning 9900 series
• Lightning 9900V series
3 or less You do not need to change the value
of DISKTIMEOUT.
Creating an HDLM Environment
3-21
Hitachi Dynamic Link Manager User Guide (for Windows(R))