From: David Greaves <david@dgreaves.com>
To: david@lang.hm
Cc: Neil Brown <neilb@suse.de>, Bill Davidsen <davidsen@tmr.com>,
linux-kernel@vger.kernel.org, linux-raid@vger.kernel.org
Subject: Re: limits on raid
Date: Fri, 22 Jun 2007 13:39:34 +0100 [thread overview]
Message-ID: <467BC306.9010008@dgreaves.com> (raw)
In-Reply-To: <Pine.LNX.4.64.0706220235590.9657@asgard.lang.hm>
david@lang.hm wrote:
> On Fri, 22 Jun 2007, David Greaves wrote:
>
>> That's not a bad thing - until you look at the complexity it brings -
>> and then consider the impact and exceptions when you do, eg hardware
>> acceleration? md information fed up to the fs layer for xfs? simple
>> long term maintenance?
>>
>> Often these problems are well worth the benefits of the feature.
>>
>> I _wonder_ if this is one where the right thing is to "just say no" :)
> so for several reasons I don't see this as something that's deserving of
> an atomatic 'no'
>
> David Lang
Err, re-read it, I hope you'll see that I agree with you - I actually just meant
the --assume-clean workaround stuff :)
If you end up 'fiddling' in md because someone specified --assume-clean on a
raid5 [in this case just to save a few minutes *testing time* on system with a
heavily choked bus!] then that adds *even more* complexity and exception cases
into all the stuff you described.
I'm very much for the fs layer reading the lower block structure so I don't have
to fiddle with arcane tuning parameters - yes, *please* help make xfs self-tuning!
Keeping life as straightforward as possible low down makes the upwards interface
more manageable and that goal more realistic...
David
next prev parent reply other threads:[~2007-06-22 12:39 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-15 2:58 limits on raid david
2007-06-15 3:05 ` Neil Brown
2007-06-15 3:43 ` david
2007-06-15 3:58 ` Neil Brown
2007-06-15 9:13 ` David Chinner
2007-06-15 22:21 ` Neil Brown
2007-06-15 11:10 ` Avi Kivity
2007-06-15 16:23 ` Jan Engelhardt
2007-06-15 17:20 ` Avi Kivity
2007-06-15 21:59 ` Neil Brown
2007-06-16 17:23 ` Avi Kivity
2007-06-17 13:00 ` Andi Kleen
2007-06-18 4:57 ` David Chinner
2007-06-21 2:56 ` Neil Brown
2007-06-21 6:39 ` David Chinner
2007-06-21 6:45 ` david
2007-06-21 8:59 ` David Greaves
2007-06-21 17:00 ` Mark Lord
2007-06-21 11:00 ` David Chinner
2007-06-21 12:40 ` Mattias Wadenstein
2007-06-21 14:40 ` Justin Piszcz
2007-06-21 16:48 ` david
2007-06-21 18:30 ` Martin K. Petersen
2007-06-21 20:08 ` Nix
2007-06-16 2:03 ` Wakko Warner
2007-06-16 3:47 ` Neil Brown
2007-06-16 4:40 ` Dan Merillat
2007-06-16 7:48 ` david
2007-06-16 13:38 ` David Greaves
2007-06-16 17:16 ` david
2007-06-17 17:16 ` Bill Davidsen
2007-06-18 17:20 ` Brendan Conoboy
2007-06-18 17:28 ` david
2007-06-18 18:03 ` Lennart Sorensen
2007-06-18 18:12 ` david
2007-06-18 18:33 ` Lennart Sorensen
2007-06-18 18:40 ` david
2007-06-18 19:11 ` Brendan Conoboy
2007-06-18 20:52 ` david
2007-06-18 21:46 ` Wakko Warner
2007-06-18 21:56 ` david
2007-06-18 22:00 ` Brendan Conoboy
2007-06-19 20:11 ` Lennart Sorensen
2007-06-19 20:51 ` david
2007-06-19 15:07 ` Phillip Susi
2007-06-19 19:28 ` david
2007-06-18 18:07 ` Brendan Conoboy
2007-06-18 18:16 ` david
2007-06-16 13:33 ` David Greaves
2007-06-17 1:44 ` dean gaudet
2007-06-21 3:01 ` Neil Brown
2007-06-21 8:49 ` David Greaves
2007-06-16 14:08 ` Wakko Warner
2007-06-17 1:47 ` dean gaudet
2007-06-17 13:28 ` Wakko Warner
2007-06-17 17:28 ` dean gaudet
2007-06-17 19:30 ` Wakko Warner
2007-06-17 19:54 ` dean gaudet
2007-06-17 20:46 ` david
2007-06-17 20:44 ` david
2007-06-17 17:14 ` Bill Davidsen
2007-06-21 23:03 ` Bill Davidsen
2007-06-22 2:24 ` Neil Brown
2007-06-22 8:10 ` David Greaves
2007-06-22 9:51 ` david
2007-06-22 12:39 ` David Greaves [this message]
2007-06-22 16:00 ` Bill Davidsen
2007-06-22 16:55 ` David Greaves
2007-06-22 18:41 ` david
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