Hitachi Dynamic Link Manager, User Manual

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3. Creating an HDLM Environment
264
Table 3-55: 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.
Table 3-56: Formula for Calculating DISKTIMEOUT
For details on how to change
MISSCOUNT
and
DISKTIMEOUT
, contact the
company with which you have a contract for Oracle Support Services.
Note that when you uninstall HDLM from the above configuration, you must
reset the values of
MISSCOUNT
and
DISKTIMEOUT
to their original values.
Therefore, make a note of the original values of
MISSCOUNT
and
DISKTIMEOUT
before changing them.
Storage system type Formula for obtaining the value of MISSCOUNT
• Lightning 9900 series
• Lightning 9900V 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
Storage system type Number of
paths
connected
to the
voting disk
Formula for obtaining the value of
DISKTIMEOUT
• Lightning 9900 series
• Lightning 9900V series
• Hitachi USP
• Universal Storage Platform V/VM
•
Virtual Storage Platform
3 or less You do not need to change the value of
DISKTIMEOUT
.
4 or more number-of-paths-connected-to-the-voting-disk
x
60 seconds
• Hitachi AMS2000/AMS/WMS/SMS
series
• Thunder 9500V series
6 or less You do not need to change the value of
DISKTIMEOUT
.
7 or more number-of-paths-connected-to-the-voting-disk
x
30 seconds