On 12/6/07, David Rees <drees76@xxxxxxxxx> wrote: > On Dec 6, 2007 1:06 AM, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote: > > On Wed, 5 Dec 2007, Jon Nelson wrote: > > > > > I saw something really similar while moving some very large (300MB to > > > 4GB) files. > > > I was really surprised to see actual disk I/O (as measured by dstat) > > > be really horrible. > > > > Any work-arounds, or just don't perform heavy reads the same time as > > writes? > > What kernel are you using? (Did I miss it in your OP?) > > The per-device write throttling in 2.6.24 should help significantly, > have you tried the latest -rc and compared to your current kernel? I was using 2.6.22.12 I think (openSUSE kernel). I can try using pretty much any kernel - I'm preparing to do an unrelated test using 2.6.24rc4 this weekend. If I remember I'll try to see what disk I/O looks like there. -- Jon - 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
