When External Lu's Emulation Type Is Open - HP StorageWorks XP12000 User Manual

• You can delete up to 256 mappings for external LUs at one time.
• Operations cannot be performed if some parts of the local array are blocked. In this case, restore
blocked parts of the local array, and retry the operation.
• When using the Thunder 9500V series subsystem as an external array, the following versions are
recommended. If you use a 9500V array with a version that is earlier than the following versions, the
SATA drive information might not display correctly.
• For Thunder 9530V, Thunder 9520V, Thunder 9570V: version 0658 or later
• For Thunder 9580V, Thunder 9585V: version 1658 or later
• Do not map multiplatform volumes of external arrays as internal LDEVs.
• After executing the Check Paths & Restore Vol., Disconnect Subsystem, or Disconnect Volume
command, click the Refresh button (
pane to update the information, and check the current status.
• When the external LU's status is Blockade, execute the Check Paths & Restore Vol. command.
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
for instructions 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 o 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 Flex Copy XP, Business Copy XP, ShadowImage for z/OS,
Continuous Access XP Journal, Universal Replicator for z/OS, Continuous Access XP, TrueCopy for
z/OS, or Snapshot XP. However, if the copy pair status is PSUE, you can execute these commands.
• You cannot execute the Disconnect Subsystem or Disconnect Volume command for external LUs that
include LDEVs for which Auto LUN XP'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 Command View XP or XP 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 4 and Table 5
to the external LU's HDD type.
Table 4

When external LU's emulation type is OPEN

Application
Database
Online Transaction Processing (OLTP)
File operation from host
(both Read and Write)
) on the Command View XP or XP Remote Web Console main
show the recommended application level for the mapped external LU according
HDD type
FC
Not Recommended
OK
"Troubleshooting External Storage
S-ATA
Not Recommended
Not Recommended
External Storage XP user guide
XP" on page 107
35