Handling concurrent system and couple data set failures

It is possible to have concurrent loss of couple data sets, systems, and other sysplex resources if a disaster, such as a power failure, occurs. Concurrent failure of one or more couple data sets and one or more systems requires a special recovery procedure. In the event that a concurrent failure occurs, XCF issues message IXC256A. If the systems identified in message IXC256A are in an unrecoverable state (such as a disabled wait state or a loss of power), those systems must be removed from the sysplex to allow couple data set recovery to proceed.

Remove each of the systems identified in message IXC256A as follows:

Perform a system reset on each system identified in IXC256A.
From an active system in the sysplex, issue the following command, where sysname is the name of the system identified in IXC256A.
```
VARY XCF,sysname,OFFLINE
```
From the same active system used in the preceding step, issue the following command, where sysname is the name of the sysname used in the preceding step.
```
VARY XCF,sysname,OFFLINE,FORCE
```