On Tue, 26 Jun 2007, Justin Piszcz wrote:
>
>
> On Tue, 26 Jun 2007, Jon Nelson wrote:
>
> > On Tue, 26 Jun 2007, Justin Piszcz wrote:
> >
> > >
> > >
> > > On Tue, 26 Jun 2007, Jon Nelson wrote:
> > >
> > > > On Mon, 25 Jun 2007, Justin Piszcz wrote:
> > > >
> > > > > Neil has a patch for the bad speed.
> > > >
> > > > What does the patch do?
I repeat: what does the patch do (or is this no longer applicable)?
> > > > sync_speed_max defaults to 200000 on this box already.
Altering sync_speed_min...
> > > > I tried a binary search of values between the default (1000)
> > > > and 60000 which resulted in some pretty weird behavior:
> > > >
> > > > at values below 26000 the rate (also confirmed via dstat output) stayed
> > > > low. 2-3MB/s. At 26000 and up, the value jumped more or less instantly
> > > > to 70-74MB/s. What makes 26000 special? If I set the value to 20000 why
> > > > do I still get 2-3MB/s actual?
> Sounds quite strange, what chunk size are you using for your RAID?
The default: 64
md0 : active raid5 sdc4[2] sda4[0] sdb4[1]
613409664 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
--
Jon Nelson <jnelson-linux-raid@xxxxxxxxxxx>
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