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16 setting up vcs – HP Hitachi Dynamic Link Manager Software User Manual

Page 265

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3. Creating an HDLM Environment

243

3.16 Setting Up VCS

When VCS is installed on an HDLM host, you can register HDLM devices, or VxVM

disk groups containing HDLM devices, as resource groups.
For details on registering resource groups, refer to the VCS documentation.

Notes

„

The I/O fencing function only supports the configurations shown in

Table 3-33: Configurations that support the I/O fencing function.
Table 3-33: Configurations that support the I/O fencing function

#

Configurations that use volume groups are not supported.

„

When using the

vxfentsthdw

command of the I/O fencing function to test

HDLM devices, make sure that among all nodes, there is only one path to the

HDLM devices that are to be tested that is online. Use the HDLM command

offline

operation to change the status of other paths to offline, and then test the

devices. If there are any nodes that have more than one online path, the

vxfentsthdw

command will end abnormally.

„

When using the VCS I/O fencing function, we recommend that you enable the

HDLM path health checking function with a one-minute checking interval.
In addition, use the following formula to calculate the minimum value to be set

for OfflineTimeout of the DiskGroup resource that is specified for the disk group

that has used an HDLM device:
value-to-be-set = a + ((b - 1) (c + 0.5

(d - 1)))

a: The checking interval for the HDLM path health checking function

b: The number of paths for each HDLM device

#1

c: The I/O timeout value for the

sd

or

ssd

driver

#2

d: The total number of all HDLM devices
#1

OS

VCS

Storage system

Service group

Solaris 9

4.1 MP2 or later

Hitachi USP, Universal

Storage Platform V/VM or
Virtual Storage Platform

Failover service group

Solaris 10

5.0 MP1 or later

Failover service group

#

Parallel service group