The LHO DAQ has three frame-writers. Two (FW0 and FW1) write to LDAS and have large disk arrays, the third (FW2) runs with a local disk and is used as a "tie breaker" if the two primary machines disagree with each other.

There are now 5 permutations of agreement between the 3 frame-writers:

All agree (0=1=2)

All disagree (0!=1!=2)

One disagrees with the other two ((0=1)!=2) ((0=2)!=1) and ((1=2)!=0)

Instead of a simple red/green LED indicator on the MEDM, we now have borders around each monitor which are red/green depending upon the agreement.