Help with Multipath

Linux and Unix-Like Red Hat
1

Hi All,

When I execute multipath -ll command that time display only 3 path (mpath1,mpath2 and mpath5), not display other 2 path (mpath3 and mpath4). I have configure 5 path in /etc/multipath.conf file. What is the reason behind it. Please help me.

Please find below the output :

###################################################

[root@server1 ~]# multipath -ll
mpath1 (360060160a71e2100de29aae7f4f9de11) dm-10 DGC,RAID 10
size=200G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| |- 1:0:1:3 sds        65:32 active ready  running
| `- 0:0:1:3 sdi        8:128 active ready  running
`-+- policy='round-robin 0' prio=0 status=enabled
  |- 1:0:0:3 sdn        8:208 active ready  running
  `- 0:0:0:3 sdd        8:48  active ready  running
mpath2 (360060160951e2100ccc3b4800798df11) dm-9 DGC,RAID 10
size=200G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| |- 1:0:0:4 sdo        8:224 active ready  running
| `- 0:0:0:4 sde        8:64  active ready  running
`-+- policy='round-robin 0' prio=0 status=enabled
  |- 1:0:1:4 sdt        65:48 active ready  running
  `- 0:0:1:4 sdj        8:144 active ready  running
mpath5 (360060160a71e210002263e3fbde0dd11) dm-11 DGC,RAID 10
size=300G features='1 queue_if_no_path' hwhandler='1 emc' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| |- 1:0:0:0 sdk        8:160 active ready  running
| `- 0:0:0:0 sda        8:0   active ready  running
`-+- policy='round-robin 0' prio=0 status=enabled
  |- 1:0:1:0 sdp        8:240 active ready  running
  `- 0:0:1:0 sdf        8:80  active ready  running

################################################

Please help me.
Thanks in advance.

2

Hi Mnmonu,

Can you provide a little more information, what is the platform that you are running on.

Have you run the commands that will create the device tree etc,

Do you have the symcli commands available?

Regards

Dave

3

Are the LUNs for mpath3 and mpath4 showing up in /dev/ directory? Please post the output of following:

egrep -v "^#|^$" /etc/multipath.conf

Also, please check /var/log/messages for any possible error messages.

4

Platform : Red Hat Enterprise Linux Server release 5.6

---------- Post updated at 11:09 AM ---------- Previous update was at 11:05 AM ----------

Hi admin_xor,

The output is :

defaults {
        user_friendly_names yes
}
multipaths {
        multipath {
                wwid                    360060160a71e210002263e3fbde0dd11
                alias                   mpath1
        }
        multipath {
                wwid                    360060160951e2100ccc3b4800798df11
                alias                   mpath2
        }
        multipath {
                wwid                    360060160a71e21009a4a0a180fe7dd11
                alias                   mpath3
        }
        multipath {
                wwid                    360060160a71e210080492a4f0fe7dd11
                alias                   mpath4
        }
        multipath {
                wwid                    360060160a71e2100de29aae7f4f9de11
                alias                   mpath5
        }
}
5

Looks fine. Is there any error message for path not being detected in /var/log/messages? Also, please post the output of:

multipath -v3
6

Hi admin_xor,

Sorry for late reply.
Actually I had some problem.

Please find the attached "multipath - v3" output.
And /var/log/messages output below:

[root@reuxeuls003 ~]# tail -10f /var/log/messages
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: table: 253:13: multipath: error getting device
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: ioctl: error adding target to table
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: multipath emc: long trespass command will be send
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: multipath emc: honor reservation bit will not be set (default)
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: table: 253:13: multipath: error getting device
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: ioctl: error adding target to table
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: multipath emc: long trespass command will be send
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: multipath emc: honor reservation bit will not be set (default)
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: table: 253:13: multipath: error getting device
Aug  3 09:52:16 reuxeuls003 kernel: device-mapper: ioctl: error adding target to table