On Thursday March 20, keld@xxxxxxxx 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 to enlarge my readahed, but the system did not allow me to have > more than a 2 MiB readahed, - well that should be ok for a 4 disk array > with 256 kiB chunks? > > I did try to have chunks of 64 kiB - but no luck. > > It seemed like it is something that the resync process builds up. > What could it be? > > Best regards > keld > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
