From: Milan Broz <mbroz@redhat.com>
To: Marc MERLIN <marc@merlins.org>
Cc: Chris Mason <chris.mason@oracle.com>,
linux-btrfs@vger.kernel.org, jeff@deserettechnology.com
Subject: Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?
Date: Mon, 13 Feb 2012 00:47:54 +0100 [thread overview]
Message-ID: <4F384FAA.5060506@redhat.com> (raw)
In-Reply-To: <20120212223242.GA31989@merlins.org>
On 02/12/2012 11:32 PM, Marc MERLIN wrote:
> Actually I had one more question.
>
> I read this page:
> http://www.redhat.com/archives/dm-devel/2011-July/msg00042.html
>
> I'm not super clear if with 3.2.5 kernel, I need to pass the special
> allow_discards option for brtfs and dm-crypt to be safe together, or whether
> they now talk through an API and everything "just works" :)
If you want discards to be supported in dmcrypt, you have to enable it manually.
The most comfortable way is just use recent cryptsetup and add
--allow-discards option to luksOpen command.
It will be never enabled by default in dmcrypt for security reasons
http://asalor.blogspot.com/2011/08/trim-dm-crypt-problems.html
Milan
next prev parent reply other threads:[~2012-02-12 23:47 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-30 0:37 brtfs on top of dmcrypt with SSD. No corruption iff write cache off? Marc MERLIN
2012-02-01 17:56 ` Chris Mason
2012-02-02 3:23 ` Marc MERLIN
2012-02-02 12:42 ` Chris Mason
[not found] ` <20120202152722.GI12429@merlins.org>
2012-02-12 22:32 ` Marc MERLIN
2012-02-12 23:47 ` Milan Broz [this message]
2012-02-13 0:14 ` Marc MERLIN
2012-02-15 15:42 ` Calvin Walton
2012-02-15 16:55 ` Marc MERLIN
2012-02-15 16:59 ` Hugo Mills
2012-02-22 10:28 ` Justin Ossevoort
2012-02-22 11:07 ` Hugo Mills
2012-02-16 6:33 ` Chris Samuel
2012-02-18 12:33 ` Martin Steigerwald
2012-02-18 12:39 ` Martin Steigerwald
2012-02-18 12:49 ` Martin Steigerwald
2012-07-18 18:13 ` brtfs on top of dmcrypt with SSD -> Trim or no Trim Marc MERLIN
2012-07-18 20:04 ` Fajar A. Nugraha
2012-07-18 20:37 ` Marc MERLIN
2012-07-18 21:34 ` Clemens Eisserer
2012-07-18 21:48 ` Marc MERLIN
2012-07-18 21:49 ` Martin Steigerwald
2012-07-18 22:04 ` Marc MERLIN
2012-07-19 10:40 ` Martin Steigerwald
2012-07-22 18:58 ` brtfs on top of dmcrypt with SSD -> ssd or nossd + crypt performance? Marc MERLIN
2012-07-22 19:35 ` Martin Steigerwald
2012-07-22 19:43 ` Martin Steigerwald
2012-07-22 20:44 ` Marc MERLIN
2012-07-22 22:41 ` brtfs on top of dmcrypt with SSD -> file access 5x slower than spinning disk Marc MERLIN
2012-07-23 6:42 ` How can btrfs take 23sec to stat 23K files from an SSD? Marc MERLIN
2012-07-24 7:56 ` Martin Steigerwald
2012-07-27 4:40 ` Marc MERLIN
2012-07-27 11:08 ` Chris Mason
2012-07-27 18:42 ` Marc MERLIN
[not found] ` <20120801053042.GG12695@merlins.org>
2012-08-01 6:01 ` Marc MERLIN
2012-08-01 6:08 ` Fajar A. Nugraha
2012-08-01 6:21 ` Marc MERLIN
2012-08-01 21:57 ` Martin Steigerwald
2012-08-02 5:07 ` Marc MERLIN
2012-08-02 11:18 ` Martin Steigerwald
2012-08-02 17:39 ` Marc MERLIN
2012-08-02 20:20 ` Martin Steigerwald
2012-08-02 20:44 ` Marc MERLIN
2012-08-02 21:21 ` Martin Steigerwald
2012-08-02 21:49 ` Marc MERLIN
2012-08-03 18:45 ` Martin Steigerwald
2012-08-16 7:45 ` Marc MERLIN
2012-08-02 11:25 ` Martin Steigerwald
2012-08-01 6:36 ` Chris Samuel
2012-08-01 6:40 ` Marc MERLIN
2012-02-18 16:07 ` brtfs on top of dmcrypt with SSD. No corruption iff write cache off? Marc MERLIN
2012-02-19 0:53 ` Clemens Eisserer
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