HP XP Auto LUN Software - Manual (Page 16)

16 Auto LUN XP for the XP1024/XP128
• Continuous Access. If the status of a HP StorageWorks Continuous Access XP volume is PSUS, PSUE, or
SMPL, the volume can be used as a source volume. If not, the volume cannot be used as a source
volume. When a Continuous Access XP pair is deleted from the main control unit (MCU), the status of
both volumes changes to SMPL, and both volumes can be used as source volumes. When a Continuous
Access XP pair is deleted from the remote control unit (RCU), the status of the P-VOL changes to PSUS,
the status of the S-VOL changes to SMPL, and both volumes can be used as source volumes.
• Business Copy. Using a BC volume as a source volume depends on the status and cascade
configuration of the volume. If the status of a BC volume is not split-pending COPY(SP) or PSUS(SP), the
volume can be used as a source volume. If the status is COPY(SP) or PSUS(SP), the volume cannot be
used as a source volume. This applies to cascaded and non-cascaded volumes.
Table 4 shows which non-cascaded volumes can be used as source volumes.
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)
Table 4 Non-cascaded volumes that can be used as source volumes
Pair configuration Use P-VOL as source volume Use S-VOLs as source volumes
Ratio of P-VOL to S-VOLs is 1:1 Yes Yes
Ratio of P-VOL to S-VOLs is 1:2 Yes Yes
Ratio of P-VOL to S-VOLs is 1:3 No Yes
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