Re: [dm-devel] Multipath path ready but not active

[Chandra Seetharaman <sekharan us ibm com>]

On Wed, 2009-07-22 at 13:34 -0500, Jim Lester wrote:
> We were doing some testing today with SLES, multipathing and iSCSI. During the test we fail
> our port on the storage controller which causes the target to move to a new port. The iSCSI
> initiator on the SLES box comes back just fine, but multipath doesn't re-activate the path,
> causing IO to hold. 
> 
> mpatha (36000d3100003d5000000000000000013) dm-7 COMPELNT,Compellent Vol
> [size=30G][features=1 queue_if_no_path][hwhandler=0]
> \_ round-robin 0 [prio=1][enabled]
>  \_ 5:0:0:5 sdm 8:192 [failed][ready]
> 
> If we run 'multipath' from the command line the path becomes active again and everything resumes.
> The failback parameter isn't set, so it should be doing the default behavior of immediate, but 
> even when we set it, it didn't work correctly. 

default is "manual"

you mean to say you have set "failback" to "immediate" and it still
didn't recover ?

Can you confirm if multipathd was running when you had the failback ?
> 
> Below is our multipath.conf file as well as all the version involved. Does anybody have any input?
> 
> defaults {
>         user_friendly_names             yes
>         path_grouping_policy            multibus
> }
> 
> blacklist {
>         devnode         "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
>         devnode         "^hd[a-z][[0-9]*]"
>         vendor          "*"
> }
> 
> blacklist_exceptions {
>         vendor  "COMPELNT"
> }
> 
> devices {
>         device {
>                 vendor                          COMPELNT
>                 product                         "Compellent Vol"
>                 path_checker                    tur
>                 polling_interval                10
>                 no_path_retry                   queue
>         }
> }
> 
> 
> Linux manns 2.6.16.60-0.21-smp #1 SMP Tue May 6 12:41:02 UTC 2008 x86_64 x86_64 x86_64 GNU/Linux
> multipath-tools v0.4.8 (08/02, 2007)
> iscsid version 2.0-868
> 
> ---
> Jim Lester | Linux/Mac Product Specialist
> Jim Lester Compellent com
> (o) 952.294.2802
> (c) 763.218.6012
> Compellent Technologies | www.compellent.com
> 
> 
> 
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