--- Ming Zhang <mingz@xxxxxxxxxxx> wrote:
> On Tue, 2006-01-17 at 09:41 -0800, K Chapman wrote:
> > > > > here is some of what one of the iscsi dev
> guys
> > > at
> > > > ibm
> > > > > said:
> > > > >
> > > > > It appears you are correct about the
> MaxCmdSN
> > > and
> > > > > ExpCmdSN. If they are equal, that should
> mean we
> > > > have
> > > > > a command queue depth of one. But it looks
> like
> > > > our
> > > > > iSCSI driver has an off-by-one-error when
> > > > determining
> > > > > if the command queue is full. I assume that
> > > after
> > > > the
> > > > > login, there is a delay of a minute or so
> before
> > > > the
> > > > > connection is closed and restarted. Is that
> the
> > > > case?
> > > >
> > > > yes, that is the case.
> > > >
> > > > > Do you actually have a target that wants to
> use
> > > a
> > > > > command queue depth of just 1? Most have
> > > anywhere
> > > > from
> > > > > 16-128 or more and so we had not hit this
> > > before.
> > > > BTW,
> > > > > what iSCSI target are you using?
> > > >
> > > > we did not adjust that until FFP. now we
> adjust
> > > that
> > > > to 2 before FFP.
> > > >
> > > > >
> > > > > As for the configuration, we curently do not
> > > have
> > > > > definite plans for extending it, though I
> have
> > > > some
> > > > > ideas of what I would like to add and I have
> had
> > > a
> > > > few
> > > > > (but not many) other customers make similar
> > > > comments.
> > > > > I will add it to our list of enhancements to
> > > > consider
> > > > > but don't expect any short-term changes.
> > > > >
> > > > > We don't have any particular tools that we
> > > > recommend.
> > > > > Some of our stuff is for internal use only,
> > > though
> > > > > there is at least one publicly available
> tool
> > > that
> > > > we
> > > > > use for file system stress....a program
> called
> > > > "dt".
> > > > > One place you can get it is from the website
> for
> > > > > "connectathon"....www.connectathon.org. Find
> the
> > > > test
> > > > > suite for iSCSI and it contains "dt".
> > > >
> > > > i see. i have dt.
> > >
> > > ibm is working on the speed issue with iet--aix.
>
> > > they
> > > asked me to reset the target for aix to low
> settings
> > > and in syslog on iet machine i see:
> > > check_segment_length(1552) too lond data 53
> 65536
> > > 8192
>
> if you have larger setting, can u get good speed?
no...
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