HP XP External Storage Software - Manual (Page 35)

Powering external arrays on or off
To power external arrays off
1. Stop read and write I/Os to the external LU that is mapped as a local array internal LDEV and
is located in the external array you want to power off.
2. Execute the Disconnect Subsystem command for the external array you want to power off.
Additional I/O to the external LU is stopped and all data in the local array cache memory is
written to the external LU (all data is destaged). For instructions, see
Disconnecting external arrays
or LUs .
3. Perform other operations required before powering the external array off.
4. Power the external array off.
CAUTION:
After executing the Disconnect Subsystem command, if you need to use the mapped external LU again,
execute the Check Paths & Restore Vol. command.
To power external arrays on
1. Power on the external array containing the external LU that is mapped as a local array internal
LDEV.
2. Execute the Check Paths & Restore Vol. command. For instructions, see Checking the connection
status and resuming external LU operations (Check Paths & Restore Vol.) .
CAUTION:
When powering the external array off after executing the Disconnect Subsystem command, you cannot
access the mapped external LU from the local array when you initially turn on the external array. You must
execute the
Check Paths & Restore Vol. command to resume using the mapped external LU. The
Check Paths & Restore Vol. command checks the defined information and the actual status of the external
LU mapped as a local array internal LDEV. If the external LU is ready to be used as a mapped volume, the
LU is set to accept I/Os and you can resume using the LU as a mapped volume.
Turning On or Off Power Supply of Both local and external arrays
This section explains how to turn on or off the power supply of both the local and external array using
HP StorageWorks Business Copy.
To turn OFF the power supply of both arrays:
1. Stop all read or write I/Os to the local array.
2. If you use NAS, stop the NAS Blade system. For details on how to stop the NAS Blade system,
see
Troubleshooting NAS Blade systems that include external arrays .
3. Split all HP StorageWorks Business Copy pairs (pairsplit operation). For details on the pairsplit
operation, refer to HP StorageWorks Business Copy User’s Guide.
4. Turn off the power supply of the local array.
External Storage XP user guide for the XP12000, XP10000, SVS200 35