[pve-devel] multipath problems

Michael Rasmussen mir at datanom.net
Wed Aug 22 08:16:22 CEST 2012


On Wed, 22 Aug 2012 05:28:08 +0000
Dietmar Maurer <dietmar at proxmox.com> wrote:

> # hdparm -t /dev/mapper/mpath1
> 
> /dev/mapper/mpath1:
> Timing buffered disk reads: 266 MB in  3.02 seconds =  88.04 MB/sec
> 
> So there is no speed gain. I already checked that traffic is routed to different network cards.
> Any idea why it is that slow?
> 
hdparm for some reasons gives wrong figures when testing iSCSI, it
seems there is a lot of overhead involved the first time it runs in
which case running several consecutive times gives more reasonable
numbers. Maybe you are facing the same so

for i in {1..5}; do
   hdparm -t /dev/mapper/mpath1
done

-- 
Hilsen/Regards
Michael Rasmussen

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