topic Re: multipath -ll command not showing anything in Operating System - Linux

multipath -ll command not showing anything

Nagendra Shastry K,C — Tue, 29 Mar 2016 16:16:59 GMT

Hi,

I have installed RHEL 7.2 on blade and it has two BHA cards and both are shwoing "Online" as state.

And even i created lun on 3PAR and presneted to server

On server, i created logical volume using lvcreate and formwated to ext3

Now, question is, command "multipath -ll" not showing anything,

some of the commands i executed to make server detect the lun is below.

echo "1" > /sys/class/fc_host/host1/issue_lip
echo "- - -" > /sys/class/scsi_host/host1/scan

All of the below commands are not working and not displaying anything.

# multipathd -v0

# multipath -v2

Also, the /dev/mapper do not show any mpathn entry in this directory.

I have below entry on /etc/multipath.conf file, also it has

blacklist {
devnode “sda”
}

defaults {
user_friendly_names yes
path_group_policy failover
}

Why the multipath -ll command not showing anything, do i need to do any different configuration? or missing any setup here?

Re: multipath -ll command not showing anything

jibinantony — Wed, 06 Apr 2016 01:18:00 GMT

How about adding Vendor specific configuration also in to multipath.conf.

The document http://h20628.www2.hp.com/km-ext/kmcsdirect/emr_na-c03290635-13.pdf , page 50 talks about Device { } section configuration for 3Par storages on RHEL 6 / 5 / 4, not mentioned anything about RHEL 7.

I have experienced similar problem in RHEL 6.x (not on 3PAR) because of misconfiguration in /etc/multipath.conf. The log message was reporting path checker related errors in /var/log/messages during daemon startup and "multipath -ll -v3" was showing some errors indicating problem in determining the paths.

Thanks

Re: multipath -ll command not showing anything

kkpro — Thu, 07 Apr 2016 05:27:01 GMT

Hi, did you uncomment default black list, it is, as I remember, put any disk there.