[dm-devel] Re: [Consult-list] dm-multipath has great throughput but we'd like more!

[Rod Nayfield <nayfield redhat com>]

On Thu, 2006-05-18 at 08:05 +0100, Bob Gautier wrote:
>  but we're wondering why we are not seeing higher
> throughput per-HBA -- the QL2340 datasheet says it should manage
> 200Mbyte/s and all switches etc. run at 2GBps.

Have you tried different values of rr_min_io in multipath.conf?  I think
the default is 1000.  (the last value of dmsetup table for the device)

-rod 

p.s. you need to purge and recreate the map, just "multipath" will make
some changes but not rr_min_io.  (bz 187534)