HP Hitachi Dynamic Link Manager Software - Manual (Page 100)

3. Creating an HDLM Environment
78
Table 3-11: 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.
„ In Oracle RAC 10g, for the following devices, device name should be matching
between the nodes:
• voting disk
• Oracle Cluster Registry
• Oracle database file
• system table area
• users table area
• ASM disk to be used for ASM disk group creation
In an environment where an HDLM raw device is used as the devices listed
above, if the HDLM raw device name does not match between the nodes, create
an alias device file of the HDLM raw device in each node by using the following
procedure and set the created alias device file in Oracle RAC 10g.
1.
Check the major number and minor number of HDLM raw devices used by
Oracle RAC 10g by executing the following command in each node:
# ls -lL
HDLM-raw-device-file
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