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Date:      Wed, 17 Jul 2013 11:06:10 +0100
From:      krad <kraduk@gmail.com>
To:        Nikos Vassiliadis <nvass@gmx.com>
Cc:        Johan Hendriks <joh.hendriks@gmail.com>, FreeBSD Questions <freebsd-questions@freebsd.org>
Subject:   Re: to gmirror or to ZFS
Message-ID:  <CALfReyeiq2JHbiAkh54L6CSjZcLy9R8LoUcXawn%2BD8GWWds91Q@mail.gmail.com>
In-Reply-To: <51E5D256.5070507@gmx.com>
References:  <4DFBC539-3CCC-4B9B-AB62-7BB846F18530@gmail.com> <alpine.BSF.2.00.1307152211180.74094@wonkity.com> <976836C5-F790-4D55-A80C-5944E8BC2575@gmail.com> <51E51558.50302@ShaneWare.Biz> <51E52190.7020008@fjl.co.uk> <CAOaKuAVULVuZxtExp=mNi-J7kMNbsxbLJVsv8nKTA0-Ru6M3%2Bw@mail.gmail.com> <6CE5718E-2646-4D8C-AF98-37384B8851C5@mac.com> <CAOaKuAU8nhaoq%2B6hCVkB%2Bb-ppiBvYPKANdWJRnYcmKaPdecwZA@mail.gmail.com> <51E5D256.5070507@gmx.com>

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not recommended anymore you should run SU+J if your version supports it


On 17 July 2013 00:08, Nikos Vassiliadis <nvass@gmx.com> wrote:

> On 07/16/13 21:27, Johan Hendriks wrote:
>
>> Op dinsdag 16 juli 2013 schreef Charles Swiger (cswiger@mac.com) het
>> volgende:
>>
>>  Hi--
>>>
>>> On Jul 16, 2013, at 10:33 AM, Johan Hendriks <joh.hendriks@gmail.com<**
>>> javascript:;>>
>>> wrote:
>>> [ ... ]
>>>
>>>> I would us a zfs for the os.
>>>> I have a couple of servers that did not survive a power failure with
>>>> gmirror.
>>>> The problems i had was when the power failed one disk was in a
>>>> rebuilding
>>>> state and then when the background fsck started or was busy for some
>>>> time
>>>> it would crash the whole server.
>>>>
>>>
>>> Well, "don't do that".  :-)
>>>
>>
>>
>> When the server reboots because of a powerfailure at night, then it boots.
>> Then it starts to rebuild the mirror on its own, and later the fsck kicks
>> in.
>>
>> Not much i can do about it.
>>
>
> You could add geom_journal which will minimize the time of fsck to a
> second or something like that. Then you don't have to use background fsck
> anymore.
>
> Actually geom_journal's manual page mentions an interesting
> side-effect of geom_journal over a geom_mirror:
>
>         you can turn off component synchronization.
>
> Geom_journal will re-play last writes so whatever was
> changed just before the crash will be re-written to both disks.
> I haven't used this but it makes sense in theory.
>
>
>  Maybe i should have done it without the automatic attachment for a new
>> device.
>>
>
> I always turn off automatic synchronization or stale components
> as well.
>
> It seems to me that people don't really use geom_journal
> or maybe they just don't talk about it like it's some
> sort of secret:)
>
> just my two cents,
>
> Nikos
>
>
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