====== SAN Storage Testing ======
 

Testing Linux multipathd SAN paths

   - Format and mount the SAN LUN.
   - Start a write to the mounted filesystem cat /dev/zero >> /pathto/mnt/testfile &
   - Now connect to the multipath daemon in interactive mode multipathd -k
   - View current paths with show maps topology

  multipathd> show maps topology
  reload: mpath5 (360060e801045249004f2a5f900000031) dm-7 HITACHI,DF600F
  [size=128G][features=0][hwhandler=0][rw]
  \_ round-robin 0 [prio=1][active]
  \_ 1:0:0:4 sdb 8:16 [active][ready]
  \_ round-robin 0 [prio=0][enabled]
  \_ 2:0:0:4 sdc 8:32 [active][ready]
  
5. There are two paths shown as sdb and sdc. Delete one path.

  del path sdb

6. Suspend with ctrl-z and check that the write is still happening.

  ls -l /pathto/mnt If testfile is still growing then the path sdc is working.

7. Resume multipath with fg 2. Re-add the path.

  add path sdb

8. Now remove the other path.

  del path sdc

9. Again suspend iwth ctrl-z and check that the test file is growing. If so then resume multipath and re-add the path.

  add path sdc

10. Testing complete. Exit with ctrl-c. Kill the write job with kill %1. Remove the test file.