El vie, 04-09-2009 a las 10:46 -0500, Mike Christie escribió:

> Can you try different IO schedulers
> 
> echo noop > /sys/block/sdXYZ/queue/scheduler
> 
> And for your IO test what are you using and what IO sizes are used? For 
> a good throughput you want lots of IO (around the queue depth of the 
> target which is probably around 128 or 256) and larger IOs (around 64 or 
> 128K).
> 
        I am running tests with dd, trying different block sizes:

lynx0:~# dd if=/dev/zero of=/var/LISTAS/kk bs=16k count=10k
10240+0 records in
10240+0 records out
167772160 bytes (168 MB) copied, 2,37322 s, 70,7 MB/s

lynx0:~# dd if=/dev/zero of=/var/LISTAS3/kk bs=16k count=10k
10240+0 records in
10240+0 records out
167772160 bytes (168 MB) copied, 2,42447 s, 69,2 MB/s

        The first is a NFS filesystem and the second an iSCSI one. But this
time, performance is very similar. When I sent this firs message, iSCSI
performance was about 10MB/s and the only change I've done meanwhile has
been restarting iscsi daemon :-(

-- 
Angel L. Mateo Martínez
Sección de Telemática
Área de Tecnologías de la Información       _o)
y las Comunicaciones Aplicadas (ATICA)      / \\
http://www.um.es/atica                    _(___V
Tfo: 868887590
Fax: 868888337


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