Thks Mike, that explains it :)

On Mar 16, 5:27 pm, Mike Christie <micha...@cs.wisc.edu> wrote:
> On 03/16/2010 04:02 PM, bennyturns wrote:
>
> > I am trying work out a formula for total failover time of my
> > multipathed iSCSI device so far I have:
>
> > failover time = nop timout + nop interval + replacement_timeout
> > seconds + scsi block device timeout(/sys/block/sdX/device/timeout)
>
> /sys/block/sdX/device/timeout is the scsi cmd timeout. It only comes
> into play if you have nops off or have their timers set higher than the
> scsi cmd timeout (you do not want to do this). When using nops if they
> timeout then if the scsi cmd timer fires, the iscsi code would basically
> tell the scsi layer they it is handling the problem so do not run the
> scsi error handler.
>
> So it is:
>
> failover time = nop timout + nop interval + replacement_timeout
> or
> /sys/block/sdX/device/timeout + replacement_timeout + min(abort, lun
> reset timeoutt, target reset timeout).
>
> > Is there anything else that I am missing?
>
> > -b
>
> > On Mar 15, 4:53 pm, Mike Christie<micha...@cs.wisc.edu>  wrote:
> >> On 03/15/2010 05:56 AM, Alex Zeffertt wrote:
>
> >>> The bugzilla ticket requests a merge of two git commits, but neither of
> >>> those contain the libiscsi.c change that addresses bug #2. Was this a
> >>> mistake, or did you deliberately omit that part of your
> >>> speed-up-conn-fail-take3.patch when you raised the ticket?
>
> >> Hey,
>
> >> It was laziness. I did not update the bugzilla. When I made it, I
> >> thought we were only hitting #1 (this was the first patch I sent in this
> >> thread). But when I was testing those 2 patches with RHEL 5, I finally
> >> hit the problem that bet was hitting. When I figured out that we were
> >> hitting #2, I made the second patch in this thread. I then just did not
> >> update the bugzilla with the new patch. For RHEL I ended up sending the
> >> second patch though.
>
>

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