Turning On Or Off The Storage System - HP StorageWorks XP24000 User Manual

Table 12 Status of the Mapping Paths in the Mapping Path Information Dialog Box
(continued)
Displayed Item
Device check error
Medium error

Turning On or Off the Storage System

This section describes how to turn on or off the local storage system and the external storage system
after the XP External Storage operation has been started.
This section includes the following procedures, and uses XP Business Copy as an example:
"Commands for Turning On or Off Only the External Storage System" (page 84)
"Turning On or Off Only the External Storage System" (page 85)
"Turning On or Off Only the Local Storage System" (page 85)
"Turning On or Off Both Storage Systems" (page 86)
When you turn on or off the power supply of only the external storage system, you need to execute
the XP External Storage commands. For details on these commands, see
On or Off Only the External Storage System" (page
CAUTION:
When you want to turn off both the local storage system and the external storage system, you
first need turn off the local storage system, and then turn off the external storage system.
When you want to turn on both the local storage system and the external storage system, you
first need to turn on the external storage system, and then turn on the local storage system.
Commands for Turning On or Off Only the External Storage System
When you turn on or off the power supply of only the external storage system while the power
supply of the local storage system remains on, you need to execute the following XP External
Storage commands:
Disconnect Subsystem command
The Disconnect Subsystem command should be executed when the external storage system is
maintained or stopped on purpose. When the Disconnect Subsystem command is executed,
the acceptance of the host I/O to the external volume that is mapped as the internal volume
is stopped. Then all the data that should belong to the external volume is written to the external
volume from the cache memory of the local storage system (all the data is destaged).
For the procedure to execute the Disconnect Subsystem command, see
Storage System or Disconnecting External Volume" (page
When you want to perform the same processing of the Disconnect Subsystem command on
individual volume, you can use the Disconnect Volume command. To delete the external volume
mapping individually, you first need to execute the Disconnect Volume command and then
the Delete Volume command. For the procedure to delete the external volume mapping, see
"Deleting the External Volume Mapping (Delete Volume Command)" (page
Check Paths & Restore Volume command
The Check Paths & Restore Volume command checks if the defined information about the
mapped external volume and the actual external volume status match. If the external volume
84 Performing XP External Storage Operations
Description
the error recovery, the status becomes Normal. If the status cannot be recovered
from the error, the path status is changed to the other status.
An external volume is mapped, but you cannot access the volume in the external
storage system.
The volume in the external storage system becomes inaccessible.
"Commands for Turning
84).
"Disconnecting External
87).
95).
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