SCF Reference Manual for the Storage Subsystem (G06.27+, H06.04+)

Configuring and Managing ServerNet Storage
Adapters
SCF Reference Manual for the Storage Subsystem—529937-008
11-23
Changing the Active Path for a Storage Adapter
Changing the Active Path for a Storage Adapter
The SWITCH ADAPTER Command on page 14-137 moves all device paths from and
to a SAC on an adapter.
Use this command before replacing a device that contains a storage adapter and dual
paths.
Considerations for SWITCH ADAPTER
•
The SWITCH ADAPTER command replaces a series of SWITCH commands for
individual paths and devices in the topology branch.
•
At the completion of the command, the SWITCH ADAPTER command returns a
count of the number of paths that did not switch. Handle any exceptions
individually.
•
You can use this command only on devices that are configured with dual paths.
•
Use the STATUS ADAPTER command to verify the path switch.
Example
1. Stop all data paths to the storage adapter before removing a PMF CRU:
-> SWITCH ADAPTER $ZZSTO.#PMF.GRP-1.MOD-1.SLOT-55, &
-> AWAY, FORCED
2. Verify the status of the storage adapter:
-> STATUS ADAPTER $ZZSTO.#PMF.GRP-1.MOD-1.SLOT-55
3. Replace the PMF CRU.
4. Restore data paths to the storage adapter after inserting the replacement PMF
CRU:
-> SWITCH ADAPTER $ZZSTO.#SNDA.GRP-21.MOD-1.SLOT-54, DEFAULT
Downloading New Firmware to Adapters and SACs
The REPLACE ADAPTER Command on page 14-101 downloads new firmware to
adapters and SACs.
Considerations for REPLACE ADAPTER
•
If the REPLACE ADAPTER command is entered correctly, the storage subsystem
manager generates an EMS message. This message names the command,
reports the time at which the command was executed, specifies the terminal from
which the command was entered, and gives the group and user numbers of the
user issuing the command.