HP StorageWorks XP Remote Web Console Software - Manual (Page 26)

Powering local arrays on or off
To power local arrays off
CAUTION: When you want to turn off both the local array and the external array, you first need
turn off the local array, and then turn off the external array.
1. Stop read and write I/Os to the external LU that is mapped as a local array internal LDEV.
2. Perform other operations required before powering the local array off.
3. Turn the local array's power off.
NOTE: As you turn the local array's power off, all data for the external LU in the local array's
cache memory is written in the external LU (all data is destaged).
To power local arrays on
CAUTION: When you want to turn on both the local array and the external array, you first need
to turn on the external array, and then turn on the local array.
1. Power on the external array containing the external LU mapped as a local array internal LDEV.
2. Turn on the local array's power.
CAUTION: When the local array is powered off after executing the Disconnect Subsystem
command, you cannot access the mapped external LU from the local array when you first power
on the local array. You must execute the Check Paths & Restore Vol . command to resume using
the mapped external LU. The Check Paths & Restore Vol. command checks if the defined information
and actual status of the external LU mapped as a local array volume match. 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
volume as a mapped volume.
CAUTION: When the Disconnect Subsystem or Disconnect Volume command is executed and all
data in cache memory is written to the external LU, the displayed information for Ex-Dev. Status
in the Device list becomes Disconnect.
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.
26 Preparing for XP External Storage operations