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Switching Off Using Systems
Be careful if you want to switch off one or more using systems in a large configuration.
If any disk subsystem in the configuration does not use bypass cards, some using
systems might lose access to disk drives if you:
v Switch off more than one using system at a time
v Switch off a using system when a disk drive has failed.
Note: For more information about bypass cards, see the publications for your disk
subsystems or enclosures.
Switching On Using Systems
When you switch on using systems of a large configuration, ensure that each using
system configures all the disk drives in the SSA loop. You can switch on each using
system and give the cfgmgr command to ensure that all the disk drives are configured.
If, however, you need your pdisk assignments to be constant between using systems,
follow the procedures given in “Configuring Devices on an SSA Loop” on page 18.
Chapter 2. Introducing SSA Loops 17