HP StorageWorks XP24000 Continuous Access Software User and Reference Guide, v01 (T5278-96002, June 2007)

Resuming Normal Operations at the Primar y Site
Once the Contin
uous Access pairs have been established in the reverse direction, you are ready to
resume normal operations at the p rimary (main) site. Remember that the Continuous Access terminology
is
now reversed: the original RCUs and S-VOLs (secondary site) are now the MCUs and P-VO Ls, and the
original MCUs a
nd
P-VOLs (primary site) a re now the RCUs and S-VOLs.
To resume normal operations at the primary site:
1. At the secondar y site, make sure that all Continuous Access pairs are in the PAIR (duplex) state.
This indicate
s
that the Continuous Access initial c opy o perations are complete.
2. H alt the applications at the remote site, and vary the P-VOLs (original S-VOLs) offline at the
remote site. This maintains synchronization of the Continuous Access Synchronous pairs.
3. Split (pairsplit-r) all Continuous Access pairs at the MCUs (original RCUs) to destage any
pending
data from cache. Confirm that the pairs are split (PSUS) before proceeding. If an error
occurs, resolve it before proceeding.
4. Release all
Continuous Access pairs at the MCUs (original RCUs). You do not need to use the
Delete Pair by Force option. For Continuous Access Asynchronous pairs, the MCU and RCU
complete all pending updates before changing the p a ir status to SMPL.
5. Change the Continuous Access settings at the MCUs (original RCUs) to prepare for normal
Continuou
s
Access operations. Delete the Continuous Access Asynchronous groups and the
RCUs (orig
inal MCUs). If youplantouse thesameremotecopyconnections,reconfigure the
ports (change initiator ports back to ordinary target ports).
6. If you plan to use the same switches, change the operating mode back to the original direction
(see “Remote Copy Connections”onpage47).
If
you plan to use the same channel extenders, change the operating mode back to the original
direction. The boxes/nodes connected to the MCUs must be set to channel-mode, and the
boxes/n
odes connected to the RCUs must be set to device-mode.
7. At the primary site, configure the initiator ports, add the RCUs, and add the Continuous Access
Asynchronous groups.
8. At the p
rimary site, establish all Continuous Access groups and pairs in the original direction.
You may use the None initial copy option because all P-VOLs and S-VOLs are synchronized.
If
there is any possibility that the volumes are not 100% synchronized, use the Entire Volume
initia
l
copy option to be safe.
9. Vary the MCU and P-VOLs online, and start the applications at the primary site.
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