IBM N Series, Hardware Manual

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Chapter 7. Highly Available controller pairs
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Complete the following steps to check the options:
1. View and note the values of the options on the local and partner nodes by using the
following command on each console:
options
The current option settings for the node are displayed on the console. Output similar to the
following example is displayed:
autosupport.doit DONT
autosupport.enable on
2. Verify that the options with comments in parentheses are set to the same value for both
nodes. The following comments are used:
Value might be overwritten in takeover
Same value required in local+partner
Same value in local+partner recommended
3. Correct any mismatched options by using the following command:
options option_name option_value
For more information about the options, see the na_options man page at this website:
http://www.ibm.com/storage/support/nas/
Parameters that must be the same on each node
The parameters that are listed in Table 7-2 must be the same so that takeover is smooth and
data is transferred between the nodes correctly.
Table 7-2 Parameters that must be the same in both nodes
7.3.7 Testing takeover and giveback
After you configure all aspects of your HA pair configuration, complete the following steps to
verify that it operates as expected:
1. Check the cabling on the HA pair configuration interconnect cables to make sure that they
are secure.
2. Verify that you can create and retrieve files on both nodes for each licensed protocol.
3. Enter the following command from the local node console:
cf takeover
The local node takes over the partner node and the following message is displayed:
takeover completed
4. Test communication between the local node and partner node. For example, you can use
the fcstat device_map command to ensure that one node can access the other node’s
disks.
Parameter Setting for
date date, rdate
NDMP (on or off) ndmp (on or off)
route table published route
route enabled routed (on or off)
Time zone time zone