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Table 38 Snapshot Pairing Status (continued)

SecondaryPrimaryPairing StatusP-VOL

Status

R/W enabledR/W enabledThe differences of the updated data of the primary and

secondary volume are controlled with copying on write.

PSUS

(PFUS)

R/W disableR/W enabled

"PSUS" status owing to an internal failure. The differences of

the updated data for the Snapshot volume are not controlled.

PSUE

(Error)

Notes:

1. V-VOL unmapped to the SVOL of a Snapshot will reply to a SCSI Inquiry, but Reading and/or Writing is not allowed.

2. Reading and writing are enabled, as long as no failure occurs in the primary volume.

Pair status relationship to Snapshot commands

Table 39 (page 169) 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 39 Pair status relationship to Snapshot commands

Snapshot Command-

pairresyncpairsplitpaircreate

Resync-S option-C option-E option-splitNo -splitPair Status

RejectedAcceptableRejectedRejectedRejectedAccepted 2SMPL1

AcceptableAccepted 1Accepted*RejectedRejectedAcceptableCOPY2

RCPY

AcceptableAccepted 1Accepted*RejectedAccepted*4AcceptablePAIR3

Accepted*2Accepted 1Accepted*RejectedAcceptableRejectedPSUS

(PFUS)

Accepted*2Accepted 1RejectedRejectedRejectedRejectedPSUE5

*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.

Controlling Auto LUN 169

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