HP XP Racks - Manual (Page 67)

You do not need to disconnect the external system when powering off only the local system.
However, if you do disconnect, when you power on the local system again, access is disabled to
the external system until you reconnect.
Procedure 12 To power off and on the local system
1. Stop read and write I/O to the local storage system.
2. Perform all necessary operations for powering off the local system.
Split pairs that use external volumes. For information on pairsplit operations, see the user
guide for the relevant software.
3. Confirm that the status of each external volume is Normal or Disconnect.
4. Perform all necessary operations to power off the local system.
5. Turn off the power supply of the local storage system.
Data in local cache memory is written to the external volume when the local system is powered
off (all data is destaged).
6. When you are ready, make sure that the external system is on and power on the local system.
Resync all pairs. For information on pairsync operations, see the user guide for the relevant
software.
7. Start read or write I/O to the local storage system
Powering off and on both storage systems
Procedure 13 To power off both local and external storage systems
1. Stop read or write I/O to the local storage system.
2. Split all pairs using external volumes (Pairsplit operation). For information on the Pairsplit
operation, see the user guide for the relevant software.
3. Confirm that the status of each external volume is Normal or Disconnect.
4. Power off the local storage system.
5. When the power supply of the local system is completely off, power off the external system.
Procedure 14 To power on both local and external storage systems
1. Power on the external system.
2. When the power supply of the external system is completely on, power on the local system.
3. Resume use of the mapped external volume.
4. Start read or write I/O to the local storage system.
Powering off and on local, external storage systems 67