HP StorageWorks External Storage XP user guide for the XP12000, XP10000, SVS200 (T1706-96009, October 2007)

• Attributes originally set for an external LU on the external array side (such as port security, LUN
security, and Volume Retention Manager attributes) are not kept when the external LU is mapped
as a local array internal LDEV. To keep the original attributes, set those attributes on the mapped
external LU from the local array side.
• If you mapped the external LU and previously set the VMA of LUN Security XP Extension in that
volume, the former VMA setting is superseded when you map the volume again. However, if
LUN Security XP Extension is not installed when you remap the volume, the volume with the VMA
setting cannot be mapped. To change the VMA setting, change it from the local array side.
• Do not combine LDEVs of multiple external volumes to create a LUSE volume. The LDEVs in the
same external volume can only be used to set the LUSE volumes. When you combine LDEVs of
multiple external volumes to create a LUSE volume, you need to consider:
• If a LUSE volume consists of multiple external volumes and one external volume has lower
performance than the other volumes, the lower performance of the volume affects the
performance of the LUSE volume.
• When an external volume which is a component of a LUSE volume is blocked, data reliability
of the LUSE volume will deteriorate because the LUSE volume has both accessible area and
inaccessible area from a host.
• When you disconnect an external volume or resume the use of an external volume, you need
to perform the operation at the same time on all the external volumes which are components
of the LUSE volume.
• Do not update a volume being used or operated by Flex Copy XP. Also do not update the external
LU on the external array side.
• 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,orDisconnect Volume
command, click the Refresh button (
) on the Command View XP or XP Remote Web Console
main pane to update the information, and check the current status.
• When t
he external LU's status is Blockade,executetheCheck 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 Troubleshooting External Storage XP for instructions
on res
toring the path to the external array.
If the
external LU's status remains Blockade even though you restored the path to the external array
andexecutedtheCheck 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
exec
uting the Disconnect Subsystem or Disconnect Volume command, stop host I/Os, and
unm
ount the volume from the host.
• Ifthevolumeisonlinefromthemainframehost,youcannotexecutetheDisconnect Subsystem
or Disconnect Volume command. Stop host I/Os to the volume, and perform the Vary Offline
ope
ration.
• 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,
Tr
ueCopy for z/OS, or Snapshot XP. However, if the copy pair status is PSUE, you can execute
these commands. When the external LU is set as a pool volume (pool-VOL) and that Snapshot XP
pair's status is PAIR, you can execute these commands.
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Preparing for External Storage XP operations