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Date:      Thu, 23 May 2013 14:18:30 +0200 (CEST)
From:      =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no>
To:        saeedeh motlagh <saeedeh.motlagh@gmail.com>
Cc:        freebsd-questions <freebsd-questions@freebsd.org>
Subject:   Re: file corruption solution (soft-update or ZFS)
Message-ID:  <alpine.BSF.2.00.1305231416330.72982@mail.fig.ol.no>
In-Reply-To: <CAN+S=WDGdL5ZabOGp+rBshjmrd9so5Q=wMc5sfDGuEAZxLe3+g@mail.gmail.com>
References:  <CAN+S=WC0ThjT6ox9YdUsAb6++f=+qfCLuct_tN=jsr3KYTezaw@mail.gmail.com> <alpine.BSF.2.00.1305230554360.98184@wonkity.com> <CAN+S=WDGdL5ZabOGp+rBshjmrd9so5Q=wMc5sfDGuEAZxLe3+g@mail.gmail.com>

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On Thu, 23 May 2013 16:44+0430, saeedeh motlagh wrote:

> thanks for your reply.
> 
> you know i have a sensitive server and unfortunately it is located some
> where that power outage happens much. so i want guarantee my data and avoid
> data lost and file corruption in my server.

Maybe you should also invest in a decent UPS.

> i do not have any problem in RAM and hardware.
> 
> i don't know which approach is more suitable for my server. using
> soft-update or ZFS. please help me to select the best one.
> 
> thank you so much
> 
> On Thu, May 23, 2013 at 4:28 PM, Warren Block <wblock@wonkity.com> wrote:
> 
> > On Thu, 23 May 2013, saeedeh motlagh wrote:
> >
> >  hello every body
> >>
> >> i have a question about fixing file corruption in freebsd.
> >>
> >> now i have freebsd8.2 and some times file corruption happened on it. this
> >> issue has a heavy cost for me and i want to avoid it or fixit it
> >> completely. so my question is:
> >>
> >> is it better to upgrade my freebsd to 9.1 and use soft update or migrate
> >> from UFS to ZFS?
> >
> > That's a judgement call, which means "it depends".
> >
> >> i heard so much about soft update -that is added in freebsd9.1-  which can
> >> fix file corruption in acceptable way with low cost but i don't know how
> >> much is reliable and efficient.
> >
> > Several things:
> >
> > Soft updates have been around for quite a while.
> > Soft updates journaling is the new addition.
> > Neither of these address file corruption.  Their purpose is to make sure
> > the filesystem does not get corrupted, but individual files could still
> > contain bad data.
> >
> >  in the other hand, i think migration from UFS to ZFS can be another
> >> solution. as i read ZFS is is created to solve all the problems related
> >> integrity file system. is it reliable enough in comparison soft-update?
> >>
> >> now, i want to know which solution is better and why?
> >
> > Again, it depends.  Does the target system have enough RAM for ZFS?  If
> > the file corruption is due to a hardware problem or an application writing
> > bad data, no filesystem can prevent that.

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| IT-ansvarlig,                 | System administrator,              |
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