On Thu, 18 Oct 2007 12:09:18 +0300 Stefan Lambrev <stefan.lambrev_at_moneybookers.com> wrote: > Hi, > > Jeremy Chadwick wrote: > > On Thu, Oct 18, 2007 at 09:20:32AM +0100, Richard Tector wrote: > > > >> Stefan Lambrev wrote: > >> > >>> > -skip- > >> 70MB/s from desktop drives is pretty respectabloe, IMHO. > >> > > > > In a RAID 1 configuration, I would say 70MByte/sec read is more than > > decent. That's about what I get from an individual drive on a > > built-in nVidia nForce 4 SATAII controller. Here's a sequential > > read from a disk on that controller, using dd and gstat; sometimes > > it hits 78MB. > > > > ad10: 476940MB <Seagate ST3500630AS 3.AAE> at ata5-master SATA300 > > > > L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name > > 1 571 571 72850 1.4 0 0 0.0 82.0| ad10 > > > > You might also want to verify that the disks are actually running > > at SATA300 speeds (which won't necessarily gain you a lot over > > SATA150, but worth turning on assuming it's compatible with your > > controller). Seagate drives, for example, have a little jumper on > > them that limits the interface to SATA150; remove it. > > > > > da0: <LSILOGIC Logical Volume 3000> Fixed Direct Access SCSI-2 device > da0: 300.000MB/s transfers > In my experience LSI lies in this message and 300.000MB/s are saying nothing. It said the same thing on my system at work while sata analyzer sitting between controller and the drive clearly showed 1.5G speed used on the actual link. -- Alexander Kabaev
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