Hi

In an IP replication configuration of more than 500 km between two Flash Systems, there are several volumes in replication (without configuring replication policies), a 1 TiB volume must be expanded in capacity at the main site.
The process for this increase would be: eliminate the replica, increase the capacity at both sites and start the replica again?
Is this process the normal one that must be carried out or is there another method in which, when you have volumes in replica, if I increase a volume in the primary site, in the secondary site the volume is automatically increased and the replication continues.

Normally you can extend replication target first, after that you can extend source. No need to break or stop existing replication.

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Hans Populaire

Original Message:
Sent: Tue January 16, 2024 12:41 PM
From: Jorge Eduardo Barriga Rios
Subject: Spectrum Virtualize – Replication - expand a volume

Hi

In an IP replication configuration of more than 500 km between two Flash Systems, there are several volumes in replication (without configuring replication policies), a 1 TiB volume must be expanded in capacity at the main site.
The process for this increase would be: eliminate the replica, increase the capacity at both sites and start the replica again?
Is this process the normal one that must be carried out or is there another method in which, when you have volumes in replica, if I increase a volume in the primary site, in the secondary site the volume is automatically increased and the replication continues.

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Jorge Eduardo Barriga Rios
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Hi

In an IP replication configuration of more than 500 km between two Flash Systems, there are several volumes in replication (without configuring replication policies), a 1 TiB volume must be expanded in capacity at the main site.
The process for this increase would be: eliminate the replica, increase the capacity at both sites and start the replica again?
Is this process the normal one that must be carried out or is there another method in which, when you have volumes in replica, if I increase a volume in the primary site, in the secondary site the volume is automatically increased and the replication continues.

This depends on what type of Replication you are using, and what code version you are running.

If you're running code 7.8.1 or newer, you can expand vDisks in a Metro Mirror (MM) or Global Mirror (GM) Remote Copy Relationship, as long as they are synchronized and not stopped, and do not have Change Volumes (or GM 'consistency protection' volumes) associated with them.  You must expand the secondary/target copy first, and then expand the primary/source copy.

If you're running Global Mirror with Change Volumes (GMCV), and running code 7.8.1 or newer, you must first convert the remote copy relationship to Global Mirror, expand as per above, and convert back to GMCV.  (Take care you're not running 8.3.1.0 thru 8.3.1.2 or 8.2.1.0 thru 8.2.1.11, due to APAR HU02058: Changing a remote copy relationship from GMCV to MM or GM can result in a Tier 2 recovery.)

i.e. Remove the Remote Copy Relationship (RCRel) from the RC Consistency Group, stop the RCRel, change the RCRel Cycling Mode to None, Remove the Master Change Volume (CV) from the RCRel, Remove the Auxiliary CV from the RCRel, Start the RCRel (now configured as regular GM instead of GMCV), wait/verify that the GM RCRel is consistent/sync'd, expand Target vDisk, expand Source vDisk, re-verify GM RCRel is consistent/sync'd, expand Aux CV, re-Add Aux CV to RCRel, expand Master CV, re-add Master CV to RCRel, stop RCRel, change the RCRel Cycling Mode to Multi, Stop RC Consistency Group (RC CG), re-add the RCRel to the RC CG, re-start the RC CG.

Hi

In an IP replication configuration of more than 500 km between two Flash Systems, there are several volumes in replication (without configuring replication policies), a 1 TiB volume must be expanded in capacity at the main site.
The process for this increase would be: eliminate the replica, increase the capacity at both sites and start the replica again?
Is this process the normal one that must be carried out or is there another method in which, when you have volumes in replica, if I increase a volume in the primary site, in the secondary site the volume is automatically increased and the replication continues.