From: NeilBrown <neilb@suse.de>
To: Namhyung Kim <namhyung@gmail.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: Software RAID and TRIM
Date: Thu, 30 Jun 2011 10:27:08 +1000 [thread overview]
Message-ID: <20110630102708.6e443bd5@notabene.brown> (raw)
In-Reply-To: <87d3hwah9v.fsf@gmail.com>
On Wed, 29 Jun 2011 22:39:24 +0900 Namhyung Kim <namhyung@gmail.com> wrote:
> NeilBrown <neilb@suse.de> writes:
>
> > On Wed, 29 Jun 2011 11:32:55 +0100 (BST) Tom De Mulder <tdm27@cam.ac.uk>
> > wrote:
> >
> >> On Tue, 28 Jun 2011, Mathias Burén wrote:
> >>
> >> > IIRC md can already pass TRIM down, but I think the filesystem needs
> >> > to know about the underlying architecture, or something, for TRIM to
> >> > work in RAID.
> >>
> >> Yes, it's (usually/ideally) the filesystem's job to invoke the TRIM
> >> command, and that's what ext4 can do. I have it working just fine on
> >> single drives, but for reasons of service reliability would need to get
> >> RAID to work.
> >>
> >> I tried (on an admittedly vanilla Ubuntu 2.6.38 kernel) the same on a two
> >> drive RAID1 md and it definitely didn't work (the blocks didn't get marked
> >> as unused and zeroed).
> >>
> >> > There's numerous discussions on this in the archives of
> >> > this mailing list.
> >>
> >> Given how fast things move in the world of SSDs at the moment, I wanted to
> >> check if any progress was made since. :-) I don't seem to be able to find
> >> any reference to this in recent kernel source commits (but I'm a complete
> >> amateur when it comes to git).
> >
> >
> > Trim support for md is a long way down my list of interesting projects (and
> > no-one else has volunteered).
> >
>
> Just out of curiosity, what are there in your list? :)
>
>
http://neil.brown.name/blog/20110216044002
I have code for the first - the bad block log - and it seems to work. But I
really need to design and then perform some more testing.
NeilBrown
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next prev parent reply other threads:[~2011-06-30 0:27 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-28 15:31 Software RAID and TRIM Tom De Mulder
2011-06-28 16:11 ` Mathias Burén
2011-06-29 10:32 ` Tom De Mulder
2011-06-29 10:45 ` NeilBrown
2011-06-29 11:10 ` Tom De Mulder
2011-06-29 11:48 ` Scott E. Armitage
2011-06-29 12:46 ` Roberto Spadim
2011-06-29 12:46 ` David Brown
2011-06-30 0:28 ` NeilBrown
2011-06-30 7:50 ` David Brown
2011-06-29 13:39 ` Namhyung Kim
2011-06-30 0:27 ` NeilBrown [this message]
2011-07-17 22:11 ` Lutz Vieweg
2011-07-17 21:57 ` Lutz Vieweg
2011-06-29 10:33 ` Tom De Mulder
2011-06-29 12:42 ` David Brown
2011-06-29 12:55 ` Tom De Mulder
2011-06-29 13:02 ` Roberto Spadim
2011-06-29 13:10 ` David Brown
2011-06-30 5:51 ` Mikael Abrahamsson
2011-07-04 9:13 ` Tom De Mulder
2011-07-04 16:26 ` Werner Fischer
2011-07-17 22:31 ` Lutz Vieweg
2011-07-17 22:16 ` Lutz Vieweg
2011-07-17 22:00 ` Lutz Vieweg
2011-06-28 16:17 ` Johannes Truschnigg
2011-06-28 16:40 ` David Brown
2011-07-17 21:52 ` Lutz Vieweg
2011-07-18 5:14 ` Mikael Abrahamsson
2011-07-18 10:35 ` David Brown
2011-07-18 10:48 ` Tom De Mulder
2011-07-18 18:09 ` Lutz Vieweg
2011-07-18 20:18 ` David Brown
2011-07-19 9:29 ` Lutz Vieweg
2011-07-19 10:22 ` David Brown
2011-07-19 13:41 ` Lutz Vieweg
2011-07-19 15:06 ` David Brown
2011-07-20 10:39 ` Lutz Vieweg
2011-07-19 14:19 ` Tom De Mulder
2011-07-20 7:42 ` David Brown
2011-07-20 12:20 ` Lutz Vieweg
2011-07-20 12:13 ` Werner Fischer
2011-07-20 12:25 ` Lutz Vieweg
2011-07-18 10:53 ` Tom De Mulder
2011-07-18 12:13 ` Werner Fischer
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