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Date:      Tue, 30 Sep 2008 14:53:51 +1000
From:      Andrew Snow <andrew@modulus.org>
To:        freebsd-stable@freebsd.org
Cc:        Jeremy Chadwick <koitsu@FreeBSD.org>
Subject:   Re: UNEXPECTED SOFT UPDATE INCONSISTENCY; RUN fsck MANUALLY
Message-ID:  <48E1B0DF.4020601@modulus.org>
In-Reply-To: <20080930043250.GA36878@icarus.home.lan>
References:  <765067435.20080926223557@takeda.tk> <20080927064417.GA43638@icarus.home.lan> <588787159.20080927003750@takeda.tk> <5f67a8c40809282030l7888d942q548d570cd0b33be9@mail.gmail.com> <20080929040025.GA97332@icarus.home.lan> <48E080C0.9070103@modulus.org> <5f67a8c40809290809j58639df8ka65184151161cab6@mail.gmail.com> <5f67a8c40809290849m413eebe6sd31a493aea506932@mail.gmail.com> <200809291744.m8THiBlR034739@apollo.backplane.com> <48E1839E.3060006@modulus.org> <20080930043250.GA36878@icarus.home.lan>

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Jeremy Chadwick wrote:
> You're the first person I've encountered who has had to disable the ZIL
> to get stability in ZFS; ouch, that must hurt.

Its not so bad: this machine is doing backups with rsync, sometimes 
running 50 simultaneously.  This workload doesn't contain any need for 
synchronous operations, and any files which didn't get written after a 
crash can simply be re-rsync.  But I hope eventually it will be fixed!

> I'm talking about the most commonly-encountered problem: kmem
> exhaustion.  People want to be able to install FreeBSD then say "Okay!
> Time to give ZFS a try!" on some separate disks, and have it work.  

Personally I don't think there's much point worrying about how to boot 
off ZFS at this stage until the code is up to date, stable, and running 
7-STABLE branch.

Until then I will also prefer to have a UFS root volume and just run ZFS 
for /usr and /home, because I still don't completely trust ZFS and I 
have a high value on being able to boot the system and have my tools 
available in /bin and /sbin.


- Andrew



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