Date: Thu, 24 May 2012 21:30:17 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Matthew Seaman" <matthew@FreeBSD.org>, "Mark Linimon" <linimon@lonesome.com> Cc: Konstantin Belousov <kostikbel@gmail.com>, "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, lev@FreeBSD.org, freebsd-current FreeBSD <freebsd-current@FreeBSD.org>, Kirk McKusick <mckusick@FreeBSD.org> Subject: Re: UFS+J panics on HEAD Message-ID: <1694F8A162EF44C1A9EEF4943D59DD51@multiplay.co.uk> 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> <4FBE92FC.5030001@FreeBSD.org>
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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.
>
> - 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.
We actually use it in very random high IOP's applications with small
requests, so high standard disk's aren't even an option so SDD's all
the way and we see nice performance.
I can't say we've compared it to say FFS as that simply doesn't provide
the management tools we needed so wasn't even considered, but its far
from shabby in our environment :)
Regards
Steve
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