IXC407W

Explanation
This system lost access to the cross-system coupling
facility (XCF) external time reference (ETR) clock.  Either the ETR
clock failed, or this system's connection to the ETR clock failed.
 All systems in the sysplex must use the same ETR clock.
If
this message appears on every system in the sysplex, the problem is
with the ETR clock itself.

System action
The system enters a restartable wait state X'0A2'.
If this system is not removed from the sysplex, the other systems
will fail.  The system writes a machine check record for the ETR failure.

Operator response
Contact hardware support.

System programmer response
Do the following: If this message appears on every system in the sysplex, there
is a problem with the ETR clock itself. Decide which system in the
sysplex you want to keep up and respond to message IXC407W on that
system by restarting it.  The restarted system removes all other systems
from the sysplex.  All the other systems enter a nonrestartable wait
state.
If this message is not issued on every system in the sysplex,
the problem probably involves this system's connection to the ETR
clock.  You can keep either this system running or all the other systems
running.  If you want to keep just this system going, ask the operator
to restart it.

In either case, ask the operator to do one of the following: Restart this system. If the ETR clock is not synchronized when
this system is restarted, this system will remove all other systems
from the sysplex.  All the systems will enter a nonrestartable wait
state.
 If the ETR clock is synchronized, this system will rejoin
the other systems in the sysplex.

Do not restart this system. If this system is not restarted,
another system in the sysplex issues message IXC402D.  RESET this
system, and reply DOWN to message IXC402D on the other system.

After the ETR clock is fixed, reIPL this system into the
sysplex.

Source
Cross System Coupling Facility (SCXCF)

Routing code
1, 2, 10

Descriptor code
1