SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

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” (page 269) 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.
• Operational firmware downloaded through a REPLACE command does not remain in effect
beyond the next system load. A system load reverts to the standard firmware file names in the
specified SYSnn.
• Flash firmware replacement is permanent until the next replacement.
• For operational firmware, you can use the CPU attribute or the ABANDON attribute to have
different SACs use different versions of the same firmware type. After determining which
version you want, use the REPLACE command to download the chosen version to all SACs
that use that firmware type.
• For operational firmware, a complete download from all CPUs on a 16-processor system takes
at least 8 minutes.
Displaying Information About Connections to SACs on an FCSA
You can use the STATUS SAC command to display current status information about connections
to a SAC on an FCSA, including worldwide names and available LUNs. For details, see “STATUS
SAC Command” (page 285).
You can use the STATS SAC command to display statistical information about the connections to
a SAC on an FCSA. You can get information about a port in the Fibre Channel link or the SAC
itself. For details, see “STATS SAC Command” (page 278).
168 Configuring and Managing ServerNet Storage Adapters