From: Milan Broz <gmazyland@gmail.com>
To: Mike Snitzer <snitzer@redhat.com>, laurent cop <laurent.cop@gmail.com>
Cc: dm-devel@redhat.com
Subject: Re: LUKS2 - RAID0 - NVME : alignment issue
Date: Fri, 19 Oct 2018 08:43:21 +0200 [thread overview]
Message-ID: <e291e3f1-b1c4-f560-c30f-40f21e4e48c5@gmail.com> (raw)
In-Reply-To: <20181018184312.GA6643@redhat.com>
On 18/10/2018 20:43, Mike Snitzer wrote:
> On Fri, Oct 12 2018 at 7:56am -0400,
> laurent cop <laurent.cop@gmail.com> wrote:
>
>> 2) Is it normal to have low performances while writing with dd. I was
>> using LUKS previously and I got only one dev mapper. Now I got 2. Does it
>> have a big impact on performances?
>
> This last question really makes me wonder: did you intend to enable the
> use of dm-integrity?
If you use an authenticated encryption in LUKS2, it must use dm-integrity as a backend,
so you get two stacked devices. (Authentication tag and random IV must be stored together
with every sector, here dm-integrity just provides a space for it, it does not
calculate anything, all is up to dm-crypt.)
m.
prev parent reply other threads:[~2018-10-19 6:43 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-12 11:56 LUKS2 - RAID0 - NVME : alignment issue laurent cop
2018-10-12 16:09 ` Ondrej Kozina
2018-10-18 17:51 ` Mikulas Patocka
2018-10-19 6:47 ` Milan Broz
2018-10-27 23:05 ` laurent cop
2018-11-04 16:33 ` Milan Broz
2018-10-18 18:43 ` Mike Snitzer
2018-10-19 6:43 ` Milan Broz [this message]
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