[stgt] iscsi load generator and benchmark tool

[Pasi Kärkkäinen]

On Wed, Dec 30, 2009 at 09:27:22AM +1100, ronnie sahlberg wrote:
> yes,
> one login for each thread.
>

Ok. Sounds like a good tool to measure performance.

-- Pasi


> 
> On Wed, Dec 30, 2009 at 8:35 AM, Pasi Kärkkäinen <pasik at iki.fi> wrote:
> > On Fri, Sep 25, 2009 at 02:39:59PM +1000, ronnie sahlberg wrote:
> >> List,
> >>
> >> You might find this tool useful.
> >> I recently added very simple iscsi support to DBENCH ( http://dbench.samba.org )
> >> so that dbench has a minimal iscsi initiator built in.
> >>
> >> This is sometimes useful since it allows to bypass any iscsi initiator
> >> layer, like open-iscsi, on the host and to get full control of exactly
> >> what commands will be issued to the target and accurate measures since
> >> one can know that the data was served across the network and not from
> >> a local cache.
> >> It is also useful since it can generate very high loads, much higher
> >> than I have been anble to generate by doing i/o through a lun mapped
> >> through the built in initiator in linux.
> >>
> >> Here i am mainly interested in high load for very small i/o sizes. I
> >> use 1k i/o size in my tests to be as pathological in my tests as
> >> possible. But you can run tests with any i/o size.
> >>
> >>
> >> The basic syntax is :
> >>
> >> $ ./dbench -B iscsi --loadfile=iscsi.txt --iscsi-lun=1
> >> --iscsi-portal=10.0.0.71 --iscsi-port=3260
> >> --iscsi-target=iqn.2007-03:mptest --warmup=0 --run-once 1
> >>
> >> to run the loadfile once and then exit and with 1 client.
> >>
> >> or
> >>
> >> $ ./dbench -B iscsi --loadfile=iscsi.txt --iscsi-lun=1
> >> --iscsi-portal=10.0.0.71 --iscsi-port=3260
> >> --iscsi-target=iqn.2007-03:mptest --warmup=0 --timelimit=5 10
> >>
> >> to run the loadfile over and over until the time runs out  and using
> >> 10 threads of execution.
> >>
> >
> > Will it make 10 logins to the iSCSI target, one login for each thread?
> >
> > -- Pasi
> >
> >
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