PROD environment which is a 4 system SSI, the 3 agent systems say VMBACKUP is unavailable.
RESID ZVMBACK in VMBACKUP CONFIG file.
IUCV *IDENT ZVMBACK GLOBAL in directory.
For SSI, RESID needs to be the same as the VMBACKUP service virtual machine ID.
The VM:Backup server is defined as a USER and named VMBACKUP.
In VMBACKUP's directory entry you should have:
* SSI Support (connect to VMB from any member)
IUCV *IDENT VMBACKUP GLOBAL
And, in VMBACKUP CONFIG:
See informational solution RI37867 for information on running VM:Backup in an SSI Environment.