# [OmniOS-discuss] iscsi timeouts

Saso Kiselkov skiselkov.ml at gmail.com
Tue Jan 21 22:09:55 UTC 2014

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    On 1/21/14, 10:01 PM, Tobias Oetiker wrote:
    > Hi Nld,
    >
    > Today Narayan Desai wrote:
    >
    >> Sorry, I should have given the requisite "yes, I know that this is a recipe
    >> for sadness, for I too have experienced said sadness".
    >>
    >> That said, we've seen this kind of problem when there was a device in a
    >> vdev that was dying a slow death. There wouldn't necessarily be any sign,
    >> aside from insanely high service times on an individual device in the pool.
    >> From this, I assume that ZFS is still sensitive to variation in underlying
    >> drive performance.
    >>
    >> Tobi, what do your drive service times look like?
    >>  -nld
    >
    > the drives seem fine, smart is not reporting anything out of the
    > ordinary and also iostat -En shows 0 on all counts
    >
    > I don't think it is a disk issue, but rather something connected
    > with the network ...
    >
    > On times the machine becomes unreachable for some time, and then it
    > is possible to login via console and all seems well internally.
    > setting the network interface offline and then online again using
    > the dladm tool brings the connectivity back immediatly. waiting
    > helps as well ... since the problem sorts itself out after a few
    > seconds to minutes ...
    >
    > we just had another 'off the net' periode for 30 minutes
    >
    > unfortunately omnios itself does not seem to realize that something
    > is off, at least dmesg does not show any kernel messages about this
    > problem ...
    >
    > we have several systems running on the S2600CP MB ... this is the
    > only one showing problems ...
    >
    > the next thing I intend todo is to upgrade the MB firmware since I
    > found that this box has an older version than the other ones ...
    >
    > System Configuration: Intel Corporation S2600CP
    > BIOS Configuration: Intel Corp. SE5C600.86B.01.06.0002.110120121539 11/01/2012
    >
    > other ideas, most welcome !

    You mentioned a couple of e-mails back that you're using Intel I350s.
    Can you verify that your kernel has:

    commit 43ae55058ad99c869a9ae39d039490e8a3680520
    Author: Dan McDonald <danmcd at nexenta.com>
    Date:   Thu Feb 7 19:27:18 2013 -0500

        3534 Disable EEE support in igb for I350
        Reviewed by: Robert Mustacchi <rm at joyent.com>
        Reviewed by: Jason King <jason.brian.king at gmail.com>
        Reviewed by: Marcel Telka <marcel at telka.sk>
        Reviewed by: Sebastien Roy <sebastien.roy at delphix.com>
        Approved by: Richard Lowe <richlowe at richlowe.net>

    I guess you can check for this string at runtime:
    $ strings /kernel/drv/amd64/igb | grep _eee_support

    If it is missing, then it could be the buggy EEE support that's throwing
    your link out of whack here.

    Cheers,
    --
    Saso

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