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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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[PATCH 0/4] dm verity: add support for error correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 03:10 +0100
  [PATCH 1/4] dm verity: clean up duplicate hashing code Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 03:10 +0100
  [PATCH 4/4] dm verity: ignore zero blocks Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 03:10 +0100
  [PATCH 3/4] dm verity: add support for forward error correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 03:10 +0100
    Re: [PATCH 3/4] dm verity: add support for forward error correction kbuild test robot <lkp@intel.com> - 2015-11-05 06:40 +0100
  [PATCH 2/4] dm verity: separate function for parsing opt args Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 03:10 +0100
  Re: [PATCH 0/4] dm verity: add support for error correction Milan Broz <mbroz@redhat.com> - 2015-11-05 08:40 +0100
    Re: [PATCH 0/4] dm verity: add support for error correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-05 18:40 +0100
      Re: [PATCH 0/4] dm verity: add support for error correction Mike Snitzer <snitzer@redhat.com> - 2015-11-09 17:40 +0100
        Re: [PATCH 0/4] dm verity: add support for error correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-09 20:20 +0100
          Re: [PATCH 0/4] dm verity: add support for error correction Mike Snitzer <snitzer@redhat.com> - 2015-11-09 21:00 +0100
          Re: [PATCH 0/4] dm verity: add support for error correction Milan Broz <mbroz@redhat.com> - 2015-11-12 11:40 +0100
          Re: [PATCH 0/4] dm verity: add support for error correction Mikulas Patocka <mpatocka@redhat.com> - 2015-11-12 20:00 +0100
    Re: [PATCH 0/4] dm verity: add support for error correction Mikulas Patocka <mpatocka@redhat.com> - 2015-11-06 18:30 +0100
      Re: [PATCH 0/4] dm verity: add support for error correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-06 20:10 +0100
        Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Zdenek Kabelac <zkabelac@redhat.com> - 2015-11-06 20:30 +0100
          Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-06 21:30 +0100
            Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Zdenek Kabelac <zkabelac@redhat.com> - 2015-11-06 22:10 +0100
              Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Sami Tolvanen <samitolvanen@google.com> - 2015-11-06 22:30 +0100
                Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Mikulas Patocka <mpatocka@redhat.com> - 2015-11-07 16:30 +0100
            Re: [dm-devel] [PATCH 0/4] dm verity: add support for error  correction Mikulas Patocka <mpatocka@redhat.com> - 2015-11-07 16:30 +0100
        Re: [PATCH 0/4] dm verity: add support for error correction Mikulas Patocka <mpatocka@redhat.com> - 2015-11-07 16:20 +0100
          Re: [PATCH 0/4] dm verity: add support for error correction Austin S Hemmelgarn <ahferroin7@gmail.com> - 2015-11-09 16:10 +0100

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