[dm-devel] Re: Multipathing to a LUN through brocade switch
Dan Gregory
dan.gregory at mci.com
Wed Jan 11 21:43:43 UTC 2006
All,
I fixed my issue with this but it brings up some other problem. It
turns out that hal installed a non-existent floppy drive as /dev/sdg.
When multipath ran it appeared to "crash" when trying to query this
device. When I added sdg to the blacklist it worked.
The question now, is there any way that you can blacklist on anything
but the /dev/* names because it would seem that in my case /dev/sdg
could potentially change at some point and my blacklist could block a
legitimate drive.
Thanks,
Dan
Dan Gregory wrote:
> Hullo,
>
> I know this list has handle many issues of users not knowing how to
> setup multipathing, but I've read all of them and Christophe's wiki and
> I can't get my system to talk to my storage array.
>
> OS: RHEL 4.2, device-mapper-multipath-0.4.5-6.0.RHEL4
>
> Configuration: I have a SunFire 4100 with one 2 port qla hba pci card
> dual connected to a single 16 port brocade silkworm which in turn in
> dual connected to a Sun StorEdge 3511. Interestingly, I get 4
> /dev/sd[c-f] associated with the same LUN. I presume that each device
> can see the LUN through each of the 2 connections from the switch to the
> 3511.
>
> I know that mapper is working because there are 2 devices that the LVM
> creates, one for / and one for swap, but the LUNs don't show up.
> multipath -v2 does not give any output, but -v3 gives information on
> all 6 of the sd[a-f] devices. The only differences in the output of
> sd[c-f] are dev_t and h:b:t:l fields (see below). I've tried to add
> entries into the multipath.conf file, but nothing changes the output and
> I never get any more devices in /dev/mapper.
>
> What am I doing wrong?
>
>
> Thanks,
> Dan
>
>
>
> (I diffed the sections in the multipath -v3 output)
>
> < ===== path sdc =====
> ---
>
>>===== path sdf =====
>
> 3c3
> < dev_t = 8:32
> ---
>
>>dev_t = 8:80
>
> 8c8
> < h:b:t:l = 1:0:0:0
> ---
>
>>h:b:t:l = 2:0:1:0
>
> 17,18c17
> < path sdd not found in pathvec
> <
> ---
>
>>path sdg not found in pathvec
>
>
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