Recovery in a 2dc configuration – HP XP7 Storage User Manual
Page 93
Corrective action
Current status
3.
Make sure that all the pairs belonging to the journal in the local site are
released.
4.
Create a Cnt Ac-J delta resync pair that extends from the local site to the
Cnt Ac-J remote site.
Local site: PSUE or PSUS
1.
Release the Cnt Ac-J pair from the local site.
Cnt Ac-J remote site: HOLD
2.
Make sure that all the pairs belonging to the journal in the local site are
released.
3.
Create a Cnt Ac-J delta resync pair that extends from the local site to the
Cnt Ac-J remote site.
Change the status of the HLDE pair back to HOLD using pairresync.
Local site: HLDE
Cnt Ac-J remote site: HOLD
Local site: SMPL
1.
Release the pair in HOLD status from the Cnt Ac-J remote site.
Cnt Ac-J remote site: HOLD
2.
Create a Cnt Ac-J delta resync pair that extends from the local site to the
Cnt Ac-J remote site.
Recovery in a 2DC configuration
Host operations are transferred to the Continuous Access Journal S-VOL in the remote site when a
disaster or failure occurs in the local site in a 2DC configuration. Failures are corrected at the local
site, host operations are transferred back, and the 2DC configuration is reestablished.
See
“2 data center configuration” (page 134)
for information and illustrations on the configuration
covered in this procedure.
To recover a 2DC configuration failure
1.
In the remote site, confirm the consistency of the Cnt Ac-J S-VOL.
2.
In the intermediate site, release the Cnt Ac-S pair using the Pairsplit-S command.
3.
In the intermediate and remote sites, release the Cnt Ac-J pair using the Pairsplit-S command.
4.
Confirm that the Cnt Ac-J S-VOL has changed to SMPL status.
5.
Resume host operations to the Cnt Ac-J S-VOL on the remote site.
NOTE:
Be aware of the following:
•
The 2DC configuration does not allow host operations on the intermediate site.
•
If the intermediate site is not connected to a host, use the remote command device for
Cnt Ac-J and Cnt Ac-S pair operations.
6.
On the local site, if Cnt Ac-S pairs exist, release them.
7.
On the remote Cnt Ac-J site, create a Cnt Ac-S pair:
•
Use the Cnt Ac-J S-VOL on the remote site as the Cnt Ac-S P-VOL. This is the current disaster
recovery production volume.
•
Use the local site volume as the Cnt Ac-S S-VOL
Follow all requirements for creating a Cnt Ac-S pair.
8.
After the new Cnt Ac-S pair is in PAIR status, stop host operations at the remote site, then
release the Cnt Ac-S pair.
9.
On the intermediate site, create a Cnt Ac-J pair to the Cnt Ac-J remote site, with no data
copying (specify None on the Copy Mode option). Specify the intermediate site volume as
the Cnt Ac-J P-VOL and the remote volume as the Cnt Ac-J S-VOL.
Recovery for 3 Cnt Ac-J/Cnt Ac-S data centers
93