HP XP7 Storage - Manual (Page 175)

Restrictions for Auto LUN
Auto LUN must be used within the following restrictions:
•
Business Copy (HOMRCF). The operation for the volume migration must be operated at the
"SMPL" or "PAIR" or "COPY" state. If not, paircreate -m cc command is rejected with
EX_CMDRJE or EX_CMDIOE. Also Business Copy cannot be operated to CC_SVOL moving
in Auto LUN. In copying CC_SVOL, the copy operation for the volume migration is stopped,
if the Business Copy pairsplit command is executed.
•
Continuous Access Synchronous (HORC). The operation for the volume migration must be
performed at the "SMPL" or "PSUS" state. If not, paircreate -m cc command is rejected
with EX_CMDRJE or EX_CMDIOE. Also HORC cannot be operated to CC_SVOL copying in
Auto LUN. On one hand, in copying CC_SVOL, the copy operation for the volume migration
is stopped, if pairresync command for of HORC is executed.
•
LDEV type for Auto LUN. The volume of the external connection for the volume migration must
be mapped to an LDEV as OPEN-V.
Continuous Access Journal MxN configuration and control
Overview
Continuous Access Journal supports 4X4 by using sysplex timers on the mainframe. However, open
systems do not have an equivalent of sysplex timers on the mainframe, because the SCSI protocol
does not have timestamps.
If the open system (RAID Manager) has the timestamp as an equivalent of sysplex timers, Continuous
Access Journal supports 4X4 on the open system.
•
RAID Manager: delivers the timestamp(CTQ-Marker) to the consistency group
•
Disk array (RCU): arbitrates the timestamp (CTQ-Marker) across multiple storage systems
connected remote command devices, and then commits the journal data.
In this architecture, RAID Manager needs to be running. If RAID Manager has stopped, the storage
system (RCU) function does not appear to exist. Therefore, the better architecture is to include the
storage system (RCU) function into RAID Manager.
RAID Manager already supports the group control across multiple storage systems in the Cnt
Ac-S_Sync group. This means that RAID Manager can support Continuous Access Journal MxN
Continuous Access Journal MxN configuration and control 175