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

[Дмитрий Глушенок]

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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