Re: [PATCH md] Speed up raid10 resync, especially for 'far' layout

["Keld Jørn Simonsen" <keld@dkuug.dk>]

On Tue, Aug 05, 2008 at 06:53:12AM -0500, Jon Nelson wrote:
> On Tue, Aug 5, 2008 at 5:14 AM, Keld Jørn Simonsen <keld@dkuug.dk> wrote:
> > Speed up raid10 resync, especially for 'far' layout
> >
> > This patch speeds up resync for raid10, especially for the 'far'
> > layout, where reading is done in 32 MiB increments and the moving of
> > heads is therefore much reduced compared to the previous 2 MiB size,
> > nd the 'far' property of striping read can be employed.
> >
> > A speed up of more than 50 % has been reported.
> 
> Actually, the time taken to 'check' the array was reduced by more than 50%.

Which corresponds to a speed up of more than 100 %.

Did you  have any indications on whether there would still be room for
improvements? What was the speed on the individual disks compared to
their nominal speed?

best regards
keld
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