[dm-devel] [Multipath] Round-robin performance limit

[Pasi Kärkkäinen]

On Thu, Apr 28, 2011 at 11:55:55AM -0400, Adam Chasen wrote:
> 
> [root at zed ~]# multipath -ll
> 3600c0ff000111346d473554d01000000 dm-3 DotHill,DH3000
> size=1.1T features='0' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=1 status=active
>   |- 88:0:0:0 sdd 8:48  active ready  running
>   |- 86:0:0:0 sdc 8:32  active ready  running
>   |- 89:0:0:0 sdg 8:96  active ready  running
>   `- 87:0:0:0 sdf 8:80  active ready  running
> 3600c0ff00011148af973554d01000000 dm-2 DotHill,DH3000
> size=1.1T features='0' hwhandler='0' wp=rw
> `-+- policy='round-robin 0' prio=1 status=active
>   |- 89:0:0:1 sdk 8:160 active ready  running
>   |- 88:0:0:1 sdi 8:128 active ready  running
>   |- 86:0:0:1 sdh 8:112 active ready  running
>   `- 87:0:0:1 sdl 8:176 active ready  running
> 
> /etc/multipath.conf
> defaults {
>         path_grouping_policy    multibus
>         rr_min_io 100
> }

Did you try a lower value for rr_min_io ?

-- Pasi

> 
> multipath-tools v0.4.9 (05/33, 2016)
> 2.6.35.11-2-fl.smp.gcc4.4.x86_64
> 
> Thanks,
> Adam
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