From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sami Tolvanen Subject: Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction Date: Fri, 6 Nov 2015 20:27:50 +0000 Message-ID: <20151106202750.GA11849@google.com> References: <1446688954-29589-1-git-send-email-samitolvanen@google.com> <563B066C.6050202@redhat.com> <20151106190634.GA2813@google.com> <563CFD6F.4040009@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <563CFD6F.4040009@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: device-mapper development Cc: Mikulas Patocka , Will Drewry , Kees Cook , Mike Snitzer , Mandeep Baines , linux-kernel@vger.kernel.org, Mark Salyzyn List-Id: dm-devel.ids On Fri, Nov 06, 2015 at 08:20:15PM +0100, Zdenek Kabelac wrote: > i.e. you have 1G of space - you want to give 250MB as 'redundancy' - > so create 4 partition.... We cannot afford to set aside 25% of read-only partition space for redundancy on mobile devices, and would rather not impact performance any more than dm-verity already does. With error correction we have 0.8% space overhead in our use case and no performance degradation if the partition is not corrupted. Sami