HP XP Data Shredder Software - Manual (Page 31)

NOTE:
To disconnect an individual LU, use the Disconnect Volume command. To delete a single external LU's
mapping, use the Disconnect Volume command and then the Delete LU command. For instructions,
see Deleting external LU mappings (Delete LU) .
• Check Paths & Restore Vol.
This command checks if defined information about the mapped external LU and the actual external LU
status match. If the external LU can be used as the mapped local array volume, the external LU is set
to accept I/O, and you can continue using the external LU as a mapped LU.
Use this command to restore the external LU, which is set to reject host I/O operations by the
Disconnect Subsystem or Disconnect Volume command, as the mapped volume. You can execute the
Check Paths & Restore Vol. command for the entire array or an individual LU.
If an error occurs in the external storage path such that the command fails, correct the error so the
path can be restored, and execute the Check Paths & Restore Vol. command again.
For instructions, see
Checking the connection status and resuming external LU operations (Check
Paths & Restore Vol.) .
NOTE:
When executing the Check Paths & Restore Vol. command, if the external LU is ready to be restored
as the mapped LU, the external LU is set to Available. However, if the external LU is not ready to be
restored, the external LU status remains as Blocked.
The following sections describe procedures to power the local and external arrays on or off.
CAUTION:
To power both the local and external arrays off, first power off the local array, and then power off
the external array.
CAUTION:
To power both the local and external arrays on, first power on the external array, and then power on
the local array. If both are supplied by a common failed power source, one option to ensure that the
external array is online and available before the XP powers up is to place the external array on an
Uninterruptible Power Supply (UPS).
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.
External Storage XP user guide 31