Primary (Mcu), Secondary (Rcu) Systems; Volume Pairs - HP StorageWorks P9000 User Manual

Primary (MCU), secondary (RCU) systems

The primary system manages the P-VOL and the following operations:
Host I/O operations to the P-VOL
Initial copy and update copy operations between the P-VOL and S-VOL
Pair status and configuration information
The secondary system manages the S-VOL and the following operations:
Remote copy operations issued by the primary system
Assists in managing pair status and configuration (for example, rejects write I/Os to the S-VOL)
The P9500 CU can function simultaneously as a primary system for one or more P-VOL, and as a
secondary system for one or more S-VOL. This kind of configuration requires that data paths and
Fibre Channel ports to be properly configured for both copy directions.
When you use XP12000 Disk Array/XP10000 Disk Array for MCU or RCU, CU number which
can be used is limited. The following table provides the range of CU number when P9500,
XP24000/XP20000 Disk Array, or XP12000 Disk Array/XP10000 Disk Array is used for MCU
or RCU.
Table 1 CU number range when P9500, XP24000/XP20000 Disk Array, or XP12000 Disk
Array/XP10000 Disk Array is used for MCU or RCU
MCU
XP12000 Disk
Array/XP10000 Disk Array
XP24000/XP20000 Disk
Array
P9500
CAUTION:
storage systems (for example, P9500 and XP12000 Disk Array/XP10000 Disk Array) make sure
that each storage system has a unique serial number. It is possible that a serial number overlap
could occur (although this is extremely rare). If you have two storage systems with the same serial
number and you need to configure remote copy pairs between the two storage systems, contact
your HP account team for assistance.

Volume pairs

As described above, original data is stored in the P-VOL and the remote copy is stored in the
S-VOL. The pair can be split, resynchronized, reverse resynchronized, and returned to the SMPL
state.
When paired, the volumes are synchronized.
When split, new data is sent to the P-VOL but not the S-VOL.
When resynchronized, changed data is copied to the S-VOL.
When necessary, data in the S-VOL can be copied to the P-VOL.
RCU
XP12000 Disk
Array/XP10000 Disk Array
MCU:0x00 to 0x3f
RCU:0x00 to 0x3f
MCU:0x00 to 0x3f
RCU:0x00 to 0x3f
MCU:0x00 to 0x3f
RCU:0x00 to 0x3f
If you are creating a Continuous Access Synchronous pair with different series of
XP24000/XP20000 Disk
Array
MCU:0x00 to 0x3f
RCU:0x00 to 0x3f
MCU:0x00 to 0xfe
RCU:0x00 to 0xfe
MCU:0x00 to 0xfe
RCU:0x00 to 0xfe
P9500
MCU:0x00 to 0x3f
RCU:0x00 to 0x3f
MCU:0x00 to 0xfe
RCU:0x00 to 0xfe
MCU:0x00 to 0xfe
RCU:0x00 to 0xfe
Volume pairs 9