On Wed, May 11, 2005 at 02:39:58PM +0200, Manuel Bouyer wrote:
> On Wed, May 11, 2005 at 12:46:19PM +0100, Patrick Welche wrote:
> > Disks:   sd0   sd1   cd0   cd1   sd2
> >  %busy                           100
> 
> So the disk is 100% busy, it's really a disk or driver issue.
>
> > 3.2G/13:25 wall time = 4.1G, so "progress" seems to be correct...
> > 
> > 3GHz P4, 2GB ram. A complication, is that sd2 is really 2 disks plugged into
> > to the lsilogic raid controller, combining them (striping?), and presenting
> > as a singe drive to the OS:
> 
> Hum. Can you try a dd on the raw device, and see what speed we get from
> a sequential read ?
> dd if=/dev/rsd2d of=/dev/null bs=64k count=1000

65536000 bytes transferred in 15.417 secs (4250891 bytes/sec)

so the same roughly 4MB/s

> The next test would be to benchmark each disk individually on the same
> controller, to see if it's an issue with the mpt driver, or the raid
> stuff in the controller itself. But if the system is in use this may not be
> doable.

Indeed.. not yet anyway..

Cheers,

Patrick