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  1. 17 6月, 2007 1 次提交
  3. 02 3月, 2007 1 次提交
    • N
      [PATCH] md: fix raid10 recovery problem. · 64a742bc
      由 NeilBrown 提交于 
      There are two errors that can lead to recovery problems with raid10
when used in 'far' more (not the default).

Due to a '>' instead of '>=' the wrong block is located which would result in
garbage being written to some random location, quite possible outside the
range of the device, causing the newly reconstructed device to fail.

The device size calculation had some rounding errors (it didn't round when it
should) and so recovery would go a few blocks too far which would again cause
a write to a random block address and probably a device error.

The code for working with device sizes was fairly confused and spread out, so
this has been tided up a bit.
Signed-off-by: NNeil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      64a742bc
  5. 12 1月, 2007 1 次提交
  7. 14 12月, 2006 1 次提交
  9. 29 10月, 2006 1 次提交
  11. 22 10月, 2006 1 次提交
  13. 03 10月, 2006 5 次提交
  15. 11 7月, 2006 1 次提交
  17. 27 6月, 2006 4 次提交
  19. 02 5月, 2006 2 次提交
  21. 02 4月, 2006 1 次提交
  23. 04 2月, 2006 1 次提交
  25. 15 1月, 2006 1 次提交
  27. 07 1月, 2006 14 次提交
  29. 29 11月, 2005 1 次提交
    • N
      [PATCH] md: improve read speed to raid10 arrays using 'far copies' · 22dfdf52
      由 NeilBrown 提交于 
      raid10 has two different layouts.  One uses near-copies (so multiple
copies of a block are at the same or similar offsets of different
devices) and the other uses far-copies (so multiple copies of a block
are stored a greatly different offsets on different devices).  The point
of far-copies is that it allows the first section (normally first half)
to be layed out in normal raid0 style, and thus provide raid0 sequential
read performance.

Unfortunately, the read balancing in raid10 makes some poor decisions
for far-copies arrays and you don't get the desired performance.  So
turn off that bad bit of read_balance for far-copies arrays.

With this patch, read speed of an 'f2' array is comparable with a raid0
with the same number of devices, though write speed is ofcourse still
very slow.
Signed-off-by: NNeil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      22dfdf52
  31. 09 11月, 2005 2 次提交
  33. 01 11月, 2005 1 次提交
    • J
      [BLOCK] Unify the seperate read/write io stat fields into arrays · a362357b
      由 Jens Axboe 提交于 
      Instead of having ->read_sectors and ->write_sectors, combine the two
into ->sectors[2] and similar for the other fields. This saves a branch
several places in the io path, since we don't have to care for what the
actual io direction is. On my x86-64 box, that's 200 bytes less text in
just the core (not counting the various drivers).
Signed-off-by: NJens Axboe <axboe@suse.de>
      a362357b
  35. 09 10月, 2005 1 次提交