Hitachi XP P9500 User Manual page 87
Hitachi dynamic link manager software user guide for windows (6.6) (hit5201-96006, november 2011)
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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:
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
•
Lightning 9900V series
•
Lightning 9900 series
•
Hitachi USP
•
Universal Storage
Platform V/VM
•
Virtual Storage Platform
•
Hitachi AMS2000/AMS/
WMS/SMS series
•
Thunder 9500V series
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
•
Lightning 9900 series
•
Lightning 9900V series
Creating an HDLM Environment
Hitachi Dynamic Link Manager User Guide (for Windows(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
Number
of paths
connecte
Formula for obtaining the value
d to the
of DISKTIMEOUT
voting
disk
3 or less
You do not need to change the value
of DISKTIMEOUT.
3-21
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