redhat-list Digest, Vol 121, Issue 1

[Yong Huang]

What I would do is compare the number of paths with the normal count. For example, my "Script to check multipath failures" at

http://yong321.freeshell.org/computer/Multipath.html

set up as a cron job, alerts me when the number of active paths is below the normal count, 4 in this case. So you establish a baseline first when all active paths are avaialable.


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Message: 2
Date: Fri, 28 Feb 2014 20:00:43 +0100
From: emmanuel segura <emi2fast at gmail.com>
To: General Red Hat Linux discussion list <redhat-list at redhat.com>
Subject: Re: [rhel6] How-to show failed paths with "multipath"
Message-ID:
    <CAE7pJ3CORoQt-JTEac3VMPpEjnGqz0rHFkBW-1D-DPiez7SOWA at mail.gmail.com>
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In the newers Suse 11 and Redhat 6, when a path is los, the dead devices
are removed from system, that's what i know


2014-02-28 19:51 GMT+01:00 Nicolas C. <rh at nryc.fr>:

> Hello,
>
> With RHEL6 on a SAN environment, is it possible to display dead paths with
> "multipath" ?
>
> This is the output of "multipath -ll" a RHEL4 server :
>
> data (360050768028107fac00000000000009f)
> [size=150 GB][features="1 queue_if_no_path"][hwhandler="0"]
> \_ round-robin 0 [enabled]
>  \_ 3:0:0:2 sde 8:64  [failed][faulty]
>  \_ 4:0:0:2 sdm 8:192 [failed][faulty]
> \_ round-robin 0 [prio=20][active]
>  \_ 3:0:1:2 sdi 8:128 [active][ready]
>  \_ 4:0:1:2 sdq 65:0  [active][ready]
>
> We can see failed paths. And this is the output on RHEL6 :
>
> sata (360050768028107fac0000000000000d0) dm-3 IBM,2145
> size=170G features='1 queue_if_no_path' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=10 status=active
>   |- 4:0:1:1 sdf 8:80  active ready  running
>   `- 3:0:1:1 sdj 8:144 active ready  running
>
> Increasing the verbose level of "multipath" doesn't work (the
> "/etc/multipath.conf" file is classic on both systems).
>
> Thanks,
>
> Nicolas