Can someone tell me what type of drives these are.

Are they internal or fibre drives attached to an EMC or something ?

oot@eadc-w-odbprd01 disks]# cat multipath_-ll.out
mpath2 (3600601602c902a00227684d66a01e011) dm-3 DGC,RAID 5
[size=200G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
\_ round-robin 0 [prio=1][active]
 \_ 5:0:0:1 sdh 8:112 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 3:0:0:1 sdc 8:32  [active][ready]
mpath1 (3600601602c902a006e616875c4fcdf11) dm-2 DGC,RAID 5
[size=200G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
\_ round-robin 0 [prio=1][active]
 \_ 5:0:0:0 sdg 8:96  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 3:0:0:0 sdb 8:16  [active][ready]
mpath5 (3600601602c902a00ae19c0106318e011) dm-6 DGC,RAID 5
[size=400G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
\_ round-robin 0 [prio=1][active]
 \_ 3:0:0:4 sdf 8:80  [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 5:0:0:4 sdk 8:160 [active][ready]
mpath4 (3600601602c902a00fcf315875f18e011) dm-5 DGC,RAID 5
[size=150G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
\_ round-robin 0 [prio=1][active]
 \_ 5:0:0:3 sdj 8:144 [active][ready]
\_ round-robin 0 [prio=0][enabled]
 \_ 3:0:0:3 sde 8:64  [active][ready]
mpath3 (3600601602c902a008052366d5d09e011) dm-4 DGC,RAID 5
[size=50G][features=1 queue_if_no_path][hwhandler=1 emc][rw]
\_ round-robin 0 [prio=1][active]
 \_ 3:0:0:2 sdd 8:48  [active][ready]
\_ round-robin 0 [prio=0][enabled]
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FranHillAuthor Commented:
They are on RedHat linux server.
seems to be emc fc drives, multipath-ed in round robin fashion
the latter line lacks the indication of the 2nd path (must be 5:0:0:2) maybe not copied from the console :-)
This is using Redhat
1. vim /usr/share/doc/device-mapper-multipath-0.4.7/multipath.conf.defaults
 And see the below. I guess that is what multipath is trying to use.
2 .You need to use "multipath -ll" (two l's) for it to show you the priority, but it looks like multipathd have everything figured out:

Also a multipathd> show topology like

reload: asm01 (1HITACHI_D60090910032) dm-6 HITACHI,DF600F [size=32G ][features=0 ][hwhandler=0 ] \_ round-robin 0 [prio=1][enabled] \_ 0:0:1:32 sdm 8:192 [active][ready] \_ round-robin 0 [prio=0][enabled] \_ 0:0:0:32 sdb 8:16 [active][ready]


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