Hp XP Continuous Access Software Bedienungsanleitung PDF herunterladen (Seite 170)

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170 HP StorageWorks Disk Array XP RAID Manager: User’s Guide

–swap[s|p](CA only) The –swaps option is executed from the

S-VOL when there is no host on the P-VOL side to

help. A remote host must be connected to the S-VOL.

Typically executed in PSUS (SSWS) state (after a

horctakeover) to facilitate fast failback without

requiring a full copy.

Unlike –swaps, –swapp requires the cooperation of

hosts at both sides. It is the equivalent of

–swaps,

executed from the original P-VOL side.

For both –swaps and –swapp, the delta data from the

original S-VOL becomes dominant and is copied to the

original P-VOL, then the P-VOL/S-VOL designations

are swapped.

The application can continue to run at the remote

failover site during this operation. At completion, the

remote failover site will own the P-VOL. When

desired, a very fast

horctakeover will allow a fast

failback of the application from the recovery site to the

original site.

The following figure describes the –swap[s|p]

operation. The left side of the diagram shows T0 (time

zero) for both the P-VOL and S-VOL, before command

execution. The right side shows T1, after command

execution.

P-VOL

S-VOL

Altered Data

R or R/W

R/W

NEW_

SVOL

NEW_

PVOL

R/W

pairresync -swaps on SVOL

pairresync -swapp on PVOL

T0 → T1 situation

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