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

[Jonathan E Brassow <jbrassow redhat com>]

On May 18, 2006, at 2:27 AM, Luca Berra wrote:

> On Thu, May 18, 2006 at 08:19:09AM +0100, Bob Gautier wrote:
> > On Thu, 2006-05-18 at 08:05 +0100, Bob Gautier wrote:
> > > Yesterday my client was testing of multipath load balancing and 
> > > failover
> > > on a system running ext3 on a logical volume which comprises about 
> > > ten
> > > SAN LUNs all reached using multipath in multibus mode over two QL2340
> > > HBAs.
> >
> > Sorry, should have also said: RHEL4u3 x86_64 on DL385 with 16Gb memory
> you could have added the storage model :)
> btw did you do any tuning (i.e. readhaead, scheduler) ?

You may also want to do raw through-put testing (lmdd perhaps) to get a 
baseline.  Certainly, the file system has to be bringing down the 
bandwidth somewhat...

 brassow