beautypg.com

HP StorageWorks XP Remote Web Console Software User Manual

Page 36

background image

You cannot execute the Disconnect Subsystem or Disconnect Volume command for external
LUs that include LDEVs set as copy pairs for XP Flex Copy, XP Business Copy, Hitachi
ShadowImage for z/OS, XP Continuous Access Journal, Hitachi Universal Replicator for z/OS,
XP Continuous Access, Hitachi TrueCopy for z/OS, or XP Snapshot. However, these commands
can be executed in one of the following cases:

When the XP Business Copy pair status is PSUE

When the ShadowImage for z/OS™ pair status is Suspend.

When the external volume is set as a pool volume (pool-VOL) and the status of that XP
Snapshot pair is PAIR

You cannot execute the Disconnect Subsystem or Disconnect Volume command for external
LUs that include LDEVs for which XP Auto LUN's migration processing is in progress.

When executing the Disconnect Subsystem or Disconnect Volume command, the displayed
information for Ex-Dev. Status in the Device list becomes Cache Destage. Even if there is no
data left in cache memory, the displayed status stays Cache Destage until the Disconnect
Subsystem or Disconnect Volume command processing is complete.

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.

When using the mapped external LU from the mainframe OS, set the Missing Interrupt Handler
(MIH) timer to 45 seconds, which is the recommended value.

In the internal processing, the external LU's RAID level is handled as RAID-1 across the board.
A bar (–) appears on the XP Command View Advanced Edition Software or Remote Web
Console panes. The external LU's RAID level is reported as RAID-1 when information about
the external array is reported to higher-level devices (OS).

Table 3 (page 36)

and

Table 4 (page 37)

show the recommended application level for the

mapped external LU according to the external LU's HDD type.

Table 3 When external LU's emulation type is OPEN

HDD type

Application

SATA

FC

Not Recommended

Not Recommended

Database

Online
Transaction
Processing
(OLTP)

Not Recommended

OK

File operation
from host

(both Read and
Write)

OK

OK

File operation
from host

(mainly Read)

Recommended

OK

Backup

Recommended

OK

Archive

36

Preparing for XP External Storage operations