# [OmniOS-discuss] Host is not being rebooted if it uses ZFS over iSCSI

Дмитрий Глушенок glush at jet.msk.su
Wed Nov 30 16:45:53 UTC 2016

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    The 'reboot' works, but it kills all processes at once (including iscsid), leaving no chances for ZFS to flush write cache. And I suspect that with current iscsi/initiator SMF service implementation the same happens (but for some reason sync(), which is being called by 'reboot' after killing all processes, is not hangs).

    > 30 нояб. 2016 г., в 18:05, Chris Siebenmann <cks at cs.toronto.edu> написал(а):
    >
    >> Does anybody uses ZFS over iSCSI?
    >>
    >> There is problem with reboots as iscsi-initiator service does not
    >> taking care of ZFS while shutting down. It leads to zpool goes into
    >> UNAVAIL state and then first sync() issued gets blocked with following
    >> stack:
    >
    > We have a significant ZFS-over-iSCSI fileserver environment and
    > haven't seen this, but we may be shutting our systems down in a
    > different way than you are.
    >
    > We're on OmniOS r151014 and we haven't seen this behavior when we
    > reboot or shut down our systems via 'reboot' or 'poweroff'. For us it
    > seems to go the other way around; running 'reboot' won't completely shut
    > down the iSCSI initiator before the machine reboots, apparently because
    > it's being held busy by our active ZFS pools.
    >
    > It may be relevant that we're using OmniOS multipathing across two
    > IPs for each target (configured statically); this might change the
    > device stack inside the kernel.
    >
    > I don't think we've ever tried 'shutdown' itself on a live production
    > system, so I don't know how that would work.
    >
    > 	- cks

    --
    Dmitry Glushenok
    Jet Infosystems

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