From: Marc MERLIN <marc@merlins.org>
To: linux-raid@vger.kernel.org
Subject: Re: Very long raid5 init/rebuild times
Date: Tue, 21 Jan 2014 08:37:55 -0800 [thread overview]
Message-ID: <20140121163755.GG10140@merlins.org> (raw)
In-Reply-To: <20140121073540.GF10140@merlins.org>
On Mon, Jan 20, 2014 at 11:35:40PM -0800, Marc MERLIN wrote:
> Howdy,
>
> I'm setting up a new array with 5 4TB drives for which I'll use dmcrypt.
>
> Question #1:
> Is it better to dmcrypt the 5 drives and then make a raid5 on top, or the opposite
> (raid5 first, and then dmcrypt)
> I used:
> cryptsetup luksFormat --align-payload=8192 -s 256 -c aes-xts-plain64 /dev/sd[mnopq]1
I should have said that this is seemingly a stupid question since obviously
if you encrypt each drive separately, you're going through the encryption
layer 5 times during rebuilds instead of just once.
However in my case, I'm not CPU-bound, so that didn't seem to be an issue
and I was more curious to know if the dmcrypt and dmraid5 layers stacked the
same regardless of which one was on top and which one at the bottom.
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/
next prev parent reply other threads:[~2014-01-21 16:37 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-21 7:35 Very long raid5 init/rebuild times Marc MERLIN
2014-01-21 16:37 ` Marc MERLIN [this message]
2014-01-21 17:08 ` Mark Knecht
2014-01-21 18:42 ` Chris Murphy
2014-01-22 7:55 ` Stan Hoeppner
2014-01-22 17:48 ` Marc MERLIN
2014-01-22 23:17 ` Stan Hoeppner
2014-01-23 14:28 ` John Stoffel
2014-01-24 1:02 ` Stan Hoeppner
2014-01-24 3:07 ` NeilBrown
2014-01-24 8:24 ` Stan Hoeppner
2014-01-23 2:37 ` Stan Hoeppner
2014-01-23 9:13 ` Marc MERLIN
2014-01-23 12:24 ` Stan Hoeppner
2014-01-23 21:01 ` Marc MERLIN
2014-01-24 5:13 ` Stan Hoeppner
2014-01-25 8:36 ` Marc MERLIN
2014-01-28 7:46 ` Stan Hoeppner
2014-01-28 16:50 ` Marc MERLIN
2014-01-29 0:56 ` Stan Hoeppner
2014-01-29 1:01 ` Marc MERLIN
2014-01-30 20:47 ` Phillip Susi
2014-02-01 22:39 ` Stan Hoeppner
2014-02-02 18:53 ` Phillip Susi
2014-02-03 6:34 ` Stan Hoeppner
2014-02-03 14:42 ` Phillip Susi
2014-02-04 3:30 ` Stan Hoeppner
2014-02-04 17:59 ` Larry Fenske
2014-02-04 18:08 ` Phillip Susi
2014-02-04 18:43 ` Stan Hoeppner
2014-02-04 18:55 ` Phillip Susi
2014-02-04 19:15 ` Stan Hoeppner
2014-02-04 20:16 ` Phillip Susi
2014-02-04 21:58 ` Stan Hoeppner
2014-02-05 1:19 ` Phillip Susi
2014-02-05 1:42 ` Stan Hoeppner
2014-01-30 20:36 ` Phillip Susi
2014-01-30 20:18 ` Phillip Susi
2014-01-22 19:38 ` Opal 2.0 SEDs on linux, was: " Chris Murphy
2014-01-21 18:31 ` Chris Murphy
2014-01-22 13:46 ` Ethan Wilson
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