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Date: Sat, 7 Nov 2015 10:20:38 -0500 (EST) From: Mikulas Patocka <mpatocka@...hat.com> To: Sami Tolvanen <samitolvanen@...gle.com> cc: device-mapper development <dm-devel@...hat.com>, Will Drewry <wad@...omium.org>, Kees Cook <keescook@...omium.org>, Mike Snitzer <snitzer@...hat.com>, Mandeep Baines <msb@...omium.org>, linux-kernel@...r.kernel.org, Mark Salyzyn <salyzyn@...gle.com> Subject: Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction On Fri, 6 Nov 2015, Sami Tolvanen wrote: > 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 You can have 20 raid5 legs (with as big chunksizes as possible - so that sequential accesses are really sequential when they hit the flash device), and that means setting aside only 5%. Or even more legs. Mikulas > 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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