Date: Thu, 24 May 2012 21:58:52 +0200 From: Matthew Seaman <matthew@FreeBSD.org> To: Mark Linimon <linimon@lonesome.com> Cc: lev@FreeBSD.org, Kirk McKusick <mckusick@FreeBSD.org>, freebsd-current FreeBSD <freebsd-current@FreeBSD.org>, Steven Hartland <killing@multiplay.co.uk>, Konstantin Belousov <kostikbel@gmail.com>, "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Subject: Re: UFS+J panics on HEAD Message-ID: <4FBE92FC.5030001@FreeBSD.org> In-Reply-To: <20120523220533.GA11122@lonesome.com> References: <38A5BC8F-A8FB-4371-AB1D-9548F5957254@lists.zabbadoz.net> <20120523131046.GC2358@deviant.kiev.zoral.com.ua> <12410676034.20120524013853@serebryakov.spb.ru> <8D72700F5CA4461BAD1C98908689CB9E@multiplay.co.uk> <20120523220533.GA11122@lonesome.com>
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On 24/05/2012 00:05, Mark Linimon wrote:
> On Wed, May 23, 2012 at 10:58:48PM +0100, Steven Hartland wrote:
>> > While it might be a shame to see FFS go by the wayside are there any=
>> > big reasons why you would rather stick with FFS instead of moving
>> > to ZFS with all the benefits that brings?
> - ZFS eats bytes for breakfast. It is completely inappropriate
> for anything with less than 4GB RAM.
>=20
> - ZFS performs poorly under disk-nearly-full conditions.
- ZFS is not optimal for situations where there are a lot of small,
randomly dispersed IOs around the disk space. Like in any sort of
RDBMS.
Even so, ZFS is certainly my personal default nowadays. On a machine of
any size, the question is not "should I use ZFS?" but "are there any
good reasons why I shouldn't use ZFS? (And if so, what could I do to
make it possible to use ZFS anyhow...)"
With Andriy's recent patches to zfsboot to extend support for Boot
Environments, it's all starting to look particularly sexy.
Cheers,
Matthew
--=20
Dr Matthew J Seaman MA, D.Phil.
PGP: http://www.infracaninophile.co.uk/pgpkey
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