When external lu's emulation type is open – HP StorageWorks XP Remote Web Console Software User Manual
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If the Check Paths & Restore Vol. command does not restore the external LU's status, the path to
the external array might be blocked. In this case, see
Troubleshooting External Storage XP
for in-
structions on restoring the path to the external array.
If the external LU's status remains Blockade even though you restored the path to the external array
and executed the Check Paths & Restore Vol. command, execute the Restore command.
•
If you execute the Disconnect Subsystem or Disconnect Volume command when I/Os from the
open system host are in progress, host I/Os to the specified volume are forcibly stopped. When
executing the Disconnect Subsystem or Disconnect Volume command, stop host I/Os, and unmount
the volume from the host.
•
If the volume is online from the mainframe host, you cannot execute the Disconnect Subsystem or
Disconnect Volume command. Stop host I/Os to the volume, and perform the Vary Offline operation.
•
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 inform-
ation 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 Discon-
nect 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
and
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)
Preparing for XP External Storage operations
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