On 26/01/11 17:37, Oliver Brakmann wrote:
On 2011-01-26 16:39, Roberto Spadim wrote:
i don't know what layout does, but, does raid1 have layout?
No, only raid10 has different layouts. For an explanation, see David's
mail, or take a look at the Wikipedia entry for non-standard RAID
levels, it illustrates the idea of the different layouts quite well,
IMO: http://en.wikipedia.org/wiki/Non-standard_RAID_levels#Linux_MD_RAID_10
There are also different layouts for raid5 and raid6, though I don't
think they make much difference unless you are doing something odd like
trying to make your mdadm raid5/6 layout exactly match that of some
hardware raid controller. There are also special layouts that are used
as intermediary steps in converting between raid5 and raid6 - you won't
want to touch these.
So raid10 is the only level with /useful/ layout options. The different
options can make a measurable speed difference, with the best choice
depending on the load. The "far 2" layout is, I think, the best choice
for common ready-heavy loads.
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