HP XP P9500 Storage - Manual (Page 155)

Pair status relationship to Snapshot commands
Pair status relationship to Snapshot commands (page 155) applies to a Snapshot context. It explains
1) what a pair status may be prior to any RAID Manager command execution, 2) what the result
would be after giving a RAID Manager command, and 3) what the pair status may be if the RAID
Manager command is Accepted.
Table 37 Pair status relationship to Snapshot commands
Snapshot Command -
pairresync pairsplit paircreate
Resync -S option -C option -E option -split No -split Pair Status
Rejected Acceptable Rejected Rejected Rejected Accepted 2 SMPL 1
Acceptable Accepted 1 Accepted* Rejected Rejected Acceptable COPYRCPY 2
Acceptable Accepted 1 Accepted* Rejected Accepted*4 Acceptable PAIR 3
Accepted*2 Accepted 1 Accepted* Rejected Acceptable Rejected PSUS
(PFUS) 4
Accepted*2 Accepted 1 Rejected Rejected Rejected Rejected PSUE 5
*A command is accepted and issued. Whether this command is executed or not depends on the microcode version of the RAID
storage system.
NOTE:
•
Pairsplit -S of a Snapshot volume is returned without verification of the state transition that
waits until SMPL state. In a SMPL state, note that the volume that was an SVOL becomes R/W
disabled and data is discarded.
•
In the "PSUE" state, Snapshot does not manage differential data between the primary volume
and secondary volume.
Controlling Auto LUN
Auto LUN, including external volumes, must be controlled using CLI in a Data Lifecycle Management
(DLCM) solution. It is possible to support volume migration (Auto LUN function) and the external
connection by operating the current Business Copy and VDEV mapping of the external connection.
Also, it is important to consider the support of Auto LUN on the compatibility based on the current
CLI interface, because RAID Manager is supporting Business Copy and the external connection.
For this purpose, RAID Manager makes the CLI interface that works by minimum compatible of the
application by specifying the COPY mode for Auto LUN to the CLI of RAID Manager.
Specifications for Auto LUN
RAID Manager must be mapped to the port for pooling of RAID in order to control the volume of
the external connection. Therefore, the external volume needs to be mapped previously to the RAID
port without connecting to the host. Following is an execution example of the volume migration
executed for LDEV#18.
Controlling Auto LUN 155