Messages in this thread | | | Date | Sat, 7 Nov 2015 10:20:38 -0500 (EST) | From | Mikulas Patocka <> | Subject | Re: [dm-devel] [PATCH 0/4] dm verity: add support for error correction |
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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
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