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<[email protected]> 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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