EMC VMAX 100K - Witness Failure Scenarios; Srdf;Metro Witness Single Failure Scenarios

Witness failure scenarios
This section depicts various single and multiple failure behaviors for SRDF/Metro
when the Witness option (Array or vWitness) is used.
Figure 45 SRDF/Metro Witness single failure scenarios
S1 S2
W
S1 and S2 remain
accessible to host
Move to bias mode
S1 and S2 call home
X
S1 S2
W
S2 failed
S1 remains accessible to host
X
S1 S2
W
S1 failed
S2 remains accessible
to host
S1 S2
W
S1 remains accessible
to host
S2 suspends
X
S1 S2
W
S1 and S2 remain
accessible to host
S1 wins future failures
S2 calls home
X
X
S1 S2
W
S1 and S2 remain
accessible to host
S2 wins future failures
S1 calls home
X
S1
S2
W
R1 side of device pair
R2 side of device pair
Witness Array/vWitness
SRDF links
X
Failure/outage
SRDF links/IP connectivity*
* Depending on witness type
Remote replication solutions
Witness failure scenarios 153