Regarding regular zfs

[Joar Jegleim]

no compression or dedup .
I've found some hardware to setup a test system where I can debug this
thorough, but it's gonna take some time .

Appreciate all help, I'll get back to you when I've got a test environment
and have done some more tests.


-- 
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Joar Jegleim
Homepage: http://cosmicb.no
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AKA: CosmicB @Freenode

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On 8 April 2013 10:47, Peter Jeremy <peter at rulingia.com> wrote:

> On 2013-Apr-08 10:29:52 +0200, Joar Jegleim <joar.jegleim at gmail.com>
> wrote:
> >I'll check how cache is doing, but as I wrote in my previous reply, the
> >'slave' server is completely unresponsive, nothing works at all for 5-15
> >seconds, when the server is responsive again (can ssh in and so on) I
> can't
> >seem to find anything in dmesg or any log hinting about anything at all
> >that went 'wrong'  .
>
> If you have iostat/gstat/top/... running, does it hang (stop updating)
> during this period?  Is it pingable during the "hang"?
>
> How about iostat/gstat/top/... running on the console?
>
> Do you have compression or dedup enabled?
>
> >I could try DDB, I'm gonna have to get back to you on that, I haven't
> >debug'ed FreeBSD kernel before and the system is in production, so I would
> >have to be cautious. I might be able to try out that during this week .
>
> Do you have a test system that you can reproduce the problem on?  The
> reason I ask about DDB it that it would be useful to get a 'ps' whilst
> the system is hung and it sounds like DDB is the only way to get that.
>
> --
> Peter Jeremy
>