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List:       dm-devel
Subject:    Re: [dm-devel] Missing path
From:       Simone Gotti <simone.gotti () email ! it>
Date:       2008-03-11 14:10:42
Message-ID: 1205244642.3123.31.camel () localhost
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Hi,

On Tue, 2008-03-11 at 14:53 +0100, Domenico Viggiani wrote:
> After adding a LUN from a EMC Clariion CX700 to a system with already many
> of these, I noticed that multipath doesn't see a path:
> 
> 360060160eb241700284f88a159efdc11
> [size=450 GB][features="1 queue_if_no_path"][hwhandler="1 emc"]
> \_ round-robin 0 [prio=1][enabled]
>  \_ 1:0:0:70  sdbo 68:32  [active][ready]
> \_ round-robin 0 [enabled]
>  \_ 0:0:3:70  sdbn 68:16  [active][ready]
>  \_ 1:0:1:70  sdbp 68:48  [active][ready]
> 
> >From SCSI layer, it is OK:
> 
> Host: scsi0 Channel: 00 Id: 02 Lun: 70
>   Vendor: DGC      Model: RAID 5           Rev: 0219
>   Type:   Direct-Access                    ANSI SCSI revision: 04
> Host: scsi0 Channel: 00 Id: 03 Lun: 70
>   Vendor: DGC      Model: RAID 5           Rev: 0219
>   Type:   Direct-Access                    ANSI SCSI revision: 04
> Host: scsi1 Channel: 00 Id: 00 Lun: 70
>   Vendor: DGC      Model: RAID 5           Rev: 0219
>   Type:   Direct-Access                    ANSI SCSI revision: 04
> Host: scsi1 Channel: 00 Id: 01 Lun: 70
>   Vendor: DGC      Model: RAID 5           Rev: 0219
>   Type:   Direct-Access                    ANSI SCSI revision: 04
> 
> but one device is missing under /dev:
> 
> brw-rw----  1 root disk 68,  16 Mar 11 14:44 /dev/sdbn
> brw-rw----  1 root disk 68,  32 Mar 11 14:45 /dev/sdbo
> brw-rw----  1 root disk 68,  48 Mar 11 14:45 /dev/sdbp
> 
> How can I fix this?


In RHEL4 until U5 there was a bug which caused the device with
major:minor=68:0 to be missing due to a too strong wrong udev rule for
capi devices:

https://bugzilla.redhat.com/show_bug.cgi?id=234170
duplicate of
https://bugzilla.redhat.com/show_bug.cgi?id=202792

http://rhn.redhat.com/errata/RHBA-2007-0784.html

Looking at your device names looks like the same.

I hope this helps.

Bye!

> 
> Thanks in advance
-- 
Simone Gotti

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