Hi, I had a question on how a target can force a path on Linux to go to "failed" state.
In the multipath -l output below, there are 4 paths to a device and all the paths are "active". What kind of response/sense code is required so as to make path sddd below to go from active to failed state ?
I guess another question is : how does device mapper recognize that a path is active or failed, in other words what sequence of SCSI opcodes is sent by Linux to discover a path and mark it dead/failed or alive ?
mpath153 (360060480000190102221533031303030) dm-154 EMC,SYMMETRIX
\_ round-robin 0 [prio=0][active]
\_ 3:0:0:11 sddd 70:176 [active][undef]
\_ 4:0:0:11 sdgt 132:144 [active][undef]
\_ 5:0:0:182 sdka 65:480 [active][undef]
\_ 6:0:0:182 sdln 68:336 [active][undef]