Unisphere for VMAX: How do I expand an RDF device while in an RDF group on VMAX

How do I expand an RDF device while it is in an RDF group?

Unable to expand an RDF TDEV meta device.

Unable to find volumes to expand an existing RDF TDEV concatenated meta device.

For example, the device is a TDEV concatenated meta:


The new TDEV's meta members to expand with, are created and not bound to any pool (should not be bound):



Trying to see these in a list does not show the TDEV devices to add:

SRDF devices cannot be used to form meta devices in one step.

The SRDF devices must first be converted to non-RDF devices. The meta devices must be formed separately on both arrays, and then the meta head on one array can be converted back to an SRDF device.

Also, once the SRDF meta device is established, it cannot be modified in one step.

If any modifications are required, it has to be converted again to a non-SRDF device first.

To resolve this issue:

1. Take the device out of the RDF and remove the RDF flag by issuing a deletepair operation:

2. Add the new TDEVs as meta, to the concatenated meta head using Unisphere for VMAX or the SYMCLI:

3. Create the pair again with new sizes and establish.

Consult the Solutions Enabler Array Management Guide for the steps to expand with an SRDF striped meta.

Note: With the VMAX3 storage array running HYPERMAX OS 5977, there is no such thing as meta. The device can be expanded by selecting the volume, clicking ">>" to expand.