Re: performance problems with raid10,f2

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

On Tue, Mar 25, 2008 at 04:13:28PM +1100, Neil Brown wrote:
> On Thursday March 20, keld@dkuug.dk wrote:
> > On Sat, Mar 15, 2008 at 12:11:51AM +0100, Keld Jørn Simonsen wrote:
> > > Hi
> > > 
> > > I have a 4 drive array with 1 TB Hitachi disks, formatted as raid10,f2
> > > 
> > > I had some strange observations:
> > > 
> > > 1. while resyncing I could get the raid to give me about 320 MB/s in
> > > sequential read, which was good. After resync had been done, and with
> > > all 4 drives active, I only get 115 MB/s.
> > 
> > This was reproducable. I dont know what could be wrong.
> 
> Is this with, or without, your patch to avoid "read-balancing" for
> raid10/far layouts?
> It sounds like it is without that patch ????
> 
> NeilBrown

I tried both without the patch and with the patch, with almost same resulte.
Is resync building some table, and could that be it?
Or could it be some time of inode traffic?

best regards
keld
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