multipathing in MSA 1000

[TI_2]

Hi

I have one MSA 1000 (with dual controller) with one expansion rack connected to one san switch. Two Redhat linux 5.3 systems are connected to same switch in a zone using qlogic HBA. I am seeing dual path for each lun on MSA 1000 and passive path gives error like below in /var/log/messages every minute.

kernel: end_request: I/O error, dev sdc, sector 0
kernel: Buffer I/O error on device sdc, logical block 0

here is the output of lssd and lssg

# lssd -l
sda 0,0,0,1 COMPAQ MSA1000 VOLUME 2.38 600805f300082280-ab97d61e65800000
sdb 0,0,0,2 COMPAQ MSA1000 VOLUME 2.38 600805f300082280-ac97d672f2b80001
sdc 0,0,1,1 COMPAQ MSA1000 VOLUME 2.38 600805f300082280-ab97d61e65800000
sdd 0,0,1,2 COMPAQ MSA1000 VOLUME 2.38 600805f300082280-ac97d672f2b80001
[root# lssg
sg0 0,0,0,0 COMPAQ MSA1000 2.38
sg1 0,0,0,1 COMPAQ MSA1000 VOLUME 2.38
sg2 0,0,0,2 COMPAQ MSA1000 VOLUME 2.38
sg3 0,0,1,0 COMPAQ MSA1000 2.38
sg4 0,0,1,1 COMPAQ MSA1000 VOLUME 2.38
sg5 0,0,1,2 COMPAQ MSA1000 VOLUME 2.38

How can i see only the active path (/dev/sda and /dev/sdb) and avoid all these errors.

Thanks
Anoop

[Matt Weil]

start multipathd

then tun multipath -ll
should look something like this

]# multipath -ll
mpath2 (360060e800570c600000070c600001101) dm-20 HP,OPEN-V
[size=718G][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=2][active]
\_ 0:0:0:2 sdc 8:32 [active][ready]
\_ 1:0:1:2 sdau 66:224 [active][ready]

[TI_2]

Hi

Do i have to do some configuration in /etc/multipath.conf as i am getting no output after starting multipathd and then running this command.

[root@usrylxap238 ~]# service multipathd start
Starting multipathd daemon: [ OK ]
[root@usrylxap238 ~]# multipath -ll
[root@usrylxap238 ~]#

[Uwe Zessin]

V2.38 is (no longer supported) active/passive controller firmware and not supported by HP when used with the device mapper.

You could try to find out if the in-box QLogic device driver can be told to do the failover handling, but it is better if you update the MSA1000 to V7 controller firmware.

[Matt Weil]

mv /etc/multipath.conf /etc/multipath.conf.org

then restart multipath.