Am 21.03.2017 um 12:34 schrieb Andreas Klauer:
On Tue, Mar 21, 2017 at 12:03:51PM +0100, Reindl Harald wrote:
but the point is that with RAID5/6 the recovery itself is *heavy random
IO* and that get *combined* with the random IO auf the normal workload
and that means *heavy load on the disks*
Where do you get that random I/O idea from? Rebuild is linear.
Or what do you mean by random I/O in this context? (RAID rebuilds)
What kind of random things do you think the RAID is doing?
the IO of a RAID5/6 rebuild is hardly linear beause the informations
(data + parity) are spread all over the disks while in case of RAID1/10
it is really linear
If you see read errors during rebuild, the most common cause is
that the rebuild also happens to be the first read test since forever.
(Happens to be the case for people who don't do any disk monitoring.)
here you go: http://www.zdnet.com/article/why-raid-6-stops-working-in-2019/
This is just wrong
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