Requesting that DFSMSdss restore the VM-formatted volume that was DUMPed by z/OS V1R10 before OA27531 was applied.

You can use the patch byte at offset X'55' to request that DFSMSdss restore the VM formatted volume that was DUMP on a z/OS® V1R10 system before OA27531 was applied.

Note that this patch byte is only valid for RESTORE tracks operations, and the patch byte is honored only when the SET PATCH command sets it on, dynamically. You must also ensure that the DUMP is a VM formatted volume made with the CPVOLUME keyword specified.

The settings are:

X'00': DFSMSdss functions normally.
Any setting other than X'00': The RESTORE will treat the contents of the DUMP as a VM formatted volume.