Building Disaster Recovery Serviceguard Solutions Using Metrocluster with Continuous Access for P9000 and XP A.11.00

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100

Figure 34 Mirror Unit Descriptors

S-VOL

P-VOL

P-Jnl

CA-MU#0

RM-MU# 0 or

Omitted

RM-MU#h1

RM-MU#h2

RM-MU#h3

RM-MU# 0 or Omitted

HORRCC_MRCF=1

RM-MU# 1

HORRCC_MRCF=1

RM-MU#2

HORRCC_MRCF=1

Jnl -MU#1

Jnl-MU#2

CA Sync/Async

CA Jnl

BC1

BC2

BC3

Jnl-MU#3

P-Jnl

BC MU#0

BC-MU#1

BC-MU#2

CA-MU# 0 can be used

for either for CA

Sync/Async or CA_Jnl

In a 3DC Sync/CAJ replication, the Continuous Access Synchronous replication must use MU# 0

and the Continuous Access Journal replication must use any of the remaining three MU# for remote

replication. Figure 35 (page 98) shows an example of configuring MU numbers in 3DC Sync/CAJ

environment when Delta Resync pair is configured between Site1 and Site3.

Figure 35 3DC Sync/CAJ solution and mirror unit descriptor usage example

Site 1

P-VOL

Jnl

Vol

Site 2

CA Sync

CA -jnl

S/P-VOL

Jnl

Vol

Site 3

S-VOL

Jnl

Vol

In a 3DC CAJ/CAJ Tri-Link configuration using Delta Resync, only mirror unit descriptors “1”, “2”

and “3” must be used for creating device groups. Figure 36 (page 99) shows an example of

configuring MU numbers in 3DC CAJ/CAJ environment when Delta Resync pair is configured

between Site2 and Site3.

98 Designing a Three Data Center Disaster Recovery Solution