31 May
2019
31 May
'19
2:36 a.m.
On Thu, May 30, 2019 at 11:47:01PM +0000, Andy Smith wrote:
Clearly it is the imbalance (of device performances)
because it
won't happen if they both perform the same. The question is why can't
RAID-10 cope with the unbalanced devices? Is it by design? Is it
generally known? Can it be fixed? etc.
Well here's some of the answer!
https://marc.info/?l=linux-raid&m=155926702609282&w=2
This allows RAID-1 to pick most idle device to do a read from:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/d…
So that explains how Linux RAID-1 is able to prefer fastest device
to read from. Same improvement was never done for Linux RAID-10.
Don't know if it could be.
Cheers,
Andy
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