HP StorageWorks Auto LUN XP user guide for the XP10000/XP12000 (December 2005)

Auto LUN XP user guide for the XP10000/XP12000 17
Table 5 shows which cascaded volumes can be used as source volumes.
If any of the following operations are performed on an Auto LUN XP source volume during migration, the
Auto LUN XP volume migration process stops:
• Continuous Access XP operations that change the volume status to something other than PSUS, PSUE, or
SMPL
• BC operations that change the volume status to COPY(SP) or PSUS(SP)
• Continuous Access XP Journal operations
LUSE source volumes
To specify a LUSE source volume for migration, specify individual LDEVs within the LUSE volume (for
example, LDEVs with high usage). Auto LUN XP migrates only specified LDEVs. If needed, specify all LDEVs
of the LUSE volume to relocate the entire LUSE volume. In this case, ensure that the required reserved target
LDEVs are available.
Target volumes
Target volumes must be reserved prior to migration. Hosts cannot access reserved volumes. The following
volumes cannot be reserved:
• Logical Unit Size Expansion (LUSE) volumes
• Volumes set as command devices
• Volumes assigned to BC or Continuous Access XP pairs
• Volumes reserved for BC operations
• Volumes with Cache LUN data stored in cache
• iSCSI volumes (for example, volumes to which paths are defined from iSCSI ports)
• Volumes in abnormal or inaccessible conditions (for example, fenced)
• Volumes Continuous Access XP Journal uses
• Volumes specified with the Read Only or Protect attribute
• Volumes that Volume Security disabled for use as secondary volumes
• Volumes that LUN Security XP Extension specified as Read Only or Protect or disabled for use as
secondary volumes
• Volumes reserved by a migration program other than Auto LUN XP
• Volumes on which the RAID Manager is performing volume migration operations.
• Volumes that form a Snapshot XP pair.
• Virtual and pool volumes.
Number of volumes
In manual migrations, the number of migration plans that can be executed concurrently might be restricted,
depending on use of other Command View XP or XP Remote Web Console programs and emulation types
and sizes of migrated volumes. Therefore, the number of migration plans that can be executed concurrently
is not constant.
A maximum of 36 Auto LUN XP copy operations can be requested at the same time. Auto LUN XP performs
migration operations sequentially (one volume at a time).
Table 5 Cascaded volumes that can be used as source volumes
Pair Configuration Use P-VOL as source volume Use S-VOLs as source volumes
L1 pair, ratio of P-VOL to S-VOLs is 1:1 Yes Yes
L1 pair, ratio of P-VOL to S-VOLs is 1:2 Yes Yes
L1 pair, ratio of P-VOL to S-VOLs is 1:3 No Yes
L2 pair, ratio of P-VOL to S-VOLs is 1:1 Yes No
L2 pair, ratio of P-VOL to S-VOLs is 1:2 No No