Hp XP P9500 Storage User Manual download pdf (Page 146)

NOTE: After the delta resync operation completes and the pair status has changed to PAIR, and,

when the Cnt Ac-J or Cnt Ac-S pair is resynchronized, then the delta resync P-VOL must be updated

from the host for a period of longer than five minutes. This is required to ensure internal

communications between the systems. This requirement also applies to all pairs in the journal in

which the Cnt Ac-J pair for delta resync resides.

However, this requirement can be eliminated by using remote command devices. See “Assigning

remote command devices ” (page 148) for details.

Prerequisite information for creating delta resync pairs

• A Cnt Ac-J delta resync pair is created in a 3DC multi-target configuration only.

• A 3DC multi-target configuration with multiple primary and secondary systems cannot be used

for delta resync.

• Use the Cnt Ac-S S-VOL in PAIR status as the delta resync P-VOL.

• Use a Cnt Ac-J S-VOL that is in PAIR status as the delta resync S-VOL.

• The mirror ID must be between 1 and 3; however, make sure it is not the same as the mirror

ID assigned to the Cnt Ac-J pair in the 3DC multi-target configuration.

• The consistency group you use for the delta resync configuration cannot be used by another

Cnt Ac-J pair.

• Follow volume combinations shown in “Volume types that can be shared with Continuous

Access Journal” (page 133).

• System option mode 506 must be ON for delta resync.

• If you create more than one Cnt Ac-J pair for delta resync, the delta resync P-VOLs in the same

master journal must:

◦ Use the same mirror ID

◦ Are paired with S-VOLs in the same restore journal

• If you plan to create in-system pairs on the remote site sharing the delta resync S-VOL, make

sure to perform the delta resync create-pair operation first, then create in-system pairs.

• You can set a back-up option in the event that the delta resync operation fails. This is done

on the Change Mirror Options window (see the Delta resync Failure step in “Changing options

used by mirrors ” (page 82)).

Procedure for creating a delta resync pair

Procedure 41 To create a Continuous Access Journal pair for delta resync pair

1. Install and set up Cnt Ac-S and Cnt Ac-J on the required systems.

2. Create a Cnt Ac-S pair on the primary system, following the information in the following topics:

• “Prerequisite information for 3DC multi-target ” (page 144)

• “Prerequisite information for creating delta resync pairs ” (page 146)

3. After the Cnt Ac-S pair status is PAIR, create the Cnt Ac-J pair on the primary system, following

the information in the following topics:

• “Prerequisite information for 3DC multi-target ” (page 144)

• “Prerequisite information for creating delta resync pairs ” (page 146)

4. Create a second Cnt Ac-J pair from the Cnt Ac-S S-VOL to the Cnt Ac-J S-VOL. Specify the

Initial Copy option as Delta.

146 Configurations with Continuous Access Synchronous

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Hp XP P9500 Storage User Manual Page 146