[lkml]   [2007]   [Jun]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: limits on raid wrote:
> I plan to test the different configurations.
> however, if I was saturating the bus with the reconstruct how can I fire
> off a dd if=/dev/zero of=/mnt/test and get ~45M/sec whild only slowing
> the reconstruct to ~4M/sec?
> I'm putting 10x as much data through the bus at that point, it would
> seem to proove that it's not the bus that's saturated.

I am unconvinced. If you take ~1MB/s for each active drive, add in SCSI
overhead, 45M/sec seems reasonable. Have you look at a running iostat
while all this is going on? Try it out- add up the kb/s from each drive
and see how close you are to your maximum theoretical IO.

Also, how's your CPU utilization?

Brendan Conoboy / Red Hat, Inc. /
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-06-18 20:11    [W:0.115 / U:1.464 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site