HI, My host is RHEL 5.4. I have a single qlogic HBA with 2 ports. Both of the ports are connected to Hitachi Open V*9 storage (via 2 different McData switches). I believe in this case I should see 2 devices under /dev/ or should I see 4?. My storage admin assigned 2 Luns for the 2 WWN for the HBA. When only one LUN (301GB) was assinged there were 8 devices under /dev/ from sdb to sdi. And when a 2nd Lun (335GB) was added there is now 12 devices under /dev/ sdb to sdm. The qlogic driver I am using is the default one thats comes with RH5.4 Now, When I configure multipath. My multipath -ll reports as: mpath1 (360060e8004770d000000770d0000018c) dm-1 HITACHI,OPEN-V*10 [size=335G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=4][active] \_ 5:0:0:1 sdc 8:32 [active][ready] \_ 5:0:0:16385 sdf 8:80 [active][ready] \_ 5:0:0:32769 sdi 8:128 [active][ready] \_ 5:0:0:49153 sdl 8:176 [active][ready] mpath0 (360060e8004770d000000770d00000154) dm-0 HITACHI,OPEN-V*9 [size=301G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=8][active] \_ 5:0:0:0 sdb 8:16 [active][ready] \_ 6:0:0:0 sdd 8:48 [active][ready] \_ 5:0:0:16384 sde 8:64 [active][ready] \_ 6:0:0:16384 sdg 8:96 [active][ready] \_ 5:0:0:32768 sdh 8:112 [active][ready] \_ 6:0:0:32768 sdj 8:144 [active][ready] \_ 5:0:0:49152 sdk 8:160 [active][ready] \_ 6:0:0:49152 sdm 8:192 [active][ready] Is this correct? But multipath -l reports: mpath1 (360060e8004770d000000770d0000018c) dm-1 HITACHI,OPEN-V*10 [size=335G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=0][active] \_ 5:0:0:1 sdc 8:32 [active][undef] \_ 5:0:0:16385 sdf 8:80 [active][undef] \_ 5:0:0:32769 sdi 8:128 [active][undef] \_ 5:0:0:49153 sdl 8:176 [active][undef] mpath0 (360060e8004770d000000770d00000154) dm-0 HITACHI,OPEN-V*9 [size=301G][features=1 queue_if_no_path][hwhandler=0][rw] \_ round-robin 0 [prio=0][active] \_ 5:0:0:0 sdb 8:16 [active][undef] \_ 6:0:0:0 sdd 8:48 [active][undef] \_ 5:0:0:16384 sde 8:64 [active][undef] \_ 6:0:0:16384 sdg 8:96 [active][undef] \_ 5:0:0:32768 sdh 8:112 [active][undef] \_ 6:0:0:32768 sdj 8:144 [active][undef] \_ 5:0:0:49152 sdk 8:160 [active][undef] \_ 6:0:0:49152 sdm 8:192 [active][undef] I donot have anything in /etc/multipath.conf execpt --- blacklist { devnode "^sda" } ## Use user friendly names, instead of using WWIDs as names. defaults { user_friendly_names yes failback immediate --- I do not know if I need to add anything to multipath.conf for HItachu Open V*9. When I pull out the fibre cable on the port 1 of my HBA, there is no failover going on and so wired to notice that my server is restarted . When I plug the cable back it there is not automatic recovery and have to restart server again. I do not know what is going on in here. Need help ! Thanks a lot Paras.