Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-22 Thread Justin Ossevoort
On 15/02/12 17:59, Hugo Mills wrote: It's a temporary location (6 months and counting) while kernel.org is static-pages-only. Hugo. Couldn't btrfs.wiki.kernel.org be made a CNAME for btrfs.ipv5.de for the time being until kernel.org is up and running? Or alternatively all requests

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-18 Thread Martin Steigerwald
Am Montag, 13. Februar 2012 schrieb Marc MERLIN: On Mon, Feb 13, 2012 at 12:47:54AM +0100, Milan Broz wrote: 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

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-18 Thread Martin Steigerwald
Sorry, I forget to keep Cc´s, different lists, different habits. To Milan Broz: Well now I noticed that you linked to your own blog entry. Please do not take my below statements personally - I might have written them a bit harshly. Actually I do not really know whether your statement that TRIM

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-18 Thread Martin Steigerwald
Am Samstag, 18. Februar 2012 schrieb Martin Steigerwald: […] Am Montag, 13. Februar 2012 schrieb Marc MERLIN: On Mon, Feb 13, 2012 at 12:47:54AM +0100, Milan Broz wrote: On 02/12/2012 11:32 PM, Marc MERLIN wrote: Actually I had one more question. I read this page:

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-18 Thread Marc MERLIN
On Sat, Feb 18, 2012 at 01:39:24PM +0100, Martin Steigerwald wrote: To Milan Broz: Well now I noticed that you linked to your own blog entry. He did not, I'm the one who did. I asked a bunch of questions since the online docs didn't address them for me. Some of you answered those for me, I

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-18 Thread Clemens Eisserer
Hi, -o discard is supported, but can have some negative consequences on performance on some SSDs or at least whether it adds worthwhile performance is up for debate The problem is, that TRIM can't be benchmarked in a traditional way - by running one run with TRIM and another one without

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-15 Thread Calvin Walton
On Sun, 2012-02-12 at 16:14 -0800, Marc MERLIN wrote: Considering that I have a fairly new crucial 256GB SDD, I'm going to assume that this bit applies to me: On the other side, TRIM is usually overrated. Drive itself should keep good performance even without TRIM, either by using internal

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-15 Thread Marc MERLIN
On Wed, Feb 15, 2012 at 10:42:43AM -0500, Calvin Walton wrote: On Sun, 2012-02-12 at 16:14 -0800, Marc MERLIN wrote: Considering that I have a fairly new crucial 256GB SDD, I'm going to assume that this bit applies to me: On the other side, TRIM is usually overrated. Drive itself should

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-15 Thread Hugo Mills
On Wed, Feb 15, 2012 at 08:55:40AM -0800, Marc MERLIN wrote: https://btrfs.wiki.kernel.org/articles/g/o/t/Gotchas.html still states 'btrfs volumes on top of dm-crypt block devices (and possibly LVM) require write-caching to be turned off on the underlying HDD. Failing to do so, in the event of

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-15 Thread Chris Samuel
On Monday 13 February 2012 11:14:00 Marc MERLIN wrote: I knew that it created some security problems but I had not yet found the page you just gave, which effectively states that TRIM isn't actually that big a win on recent SSDs (I thought it was actually pretty important to use it on them

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-12 Thread Marc MERLIN
On Thu, Feb 02, 2012 at 07:27:22AM -0800, Marc MERLIN wrote: On Thu, Feb 02, 2012 at 07:42:41AM -0500, Chris Mason wrote: On Wed, Feb 01, 2012 at 07:23:45PM -0800, Marc MERLIN wrote: On Wed, Feb 01, 2012 at 12:56:24PM -0500, Chris Mason wrote: Second, I was wondering if anyone is

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-12 Thread Milan Broz
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,

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-12 Thread Marc MERLIN
On Mon, Feb 13, 2012 at 12:47:54AM +0100, Milan Broz wrote: 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

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-01 Thread Chris Mason
On Sun, Jan 29, 2012 at 04:37:54PM -0800, Marc MERLIN wrote: Howdy, I'm considering using brtfs for my new laptop install. Encryption is however a requirement, and ecryptfs doesn't quite cut it for me, so that leaves me with dmcrypt which is what I've been using with ext3/ext4 for years.

Re: brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-02-01 Thread Marc MERLIN
On Wed, Feb 01, 2012 at 12:56:24PM -0500, Chris Mason wrote: Second, I was wondering if anyone is running btrfs over dmcrypt on an SSD and what the performance is like with write cache turned off (I'm actually not too sure what the impact is for SSDs considering that writing to flash can

brtfs on top of dmcrypt with SSD. No corruption iff write cache off?

2012-01-29 Thread Marc MERLIN
Howdy, I'm considering using brtfs for my new laptop install. Encryption is however a requirement, and ecryptfs doesn't quite cut it for me, so that leaves me with dmcrypt which is what I've been using with ext3/ext4 for years. https://btrfs.wiki.kernel.org/articles/g/o/t/Gotchas.html still