Re: Performance Characteristics of All Linux RAIDs(mdadm/bonnie++)

[Justin Piszcz]

On Wed, 28 May 2008, Jens Bäckman wrote:

> On Wed, May 28, 2008 at 10:53 AM, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote:
> > Results:
> >
> > http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.html
> > http://home.comcast.net/~jpiszcz/raid/20080528/raid-levels.txt
>
> Either the RAID 1 read speed must be wrong, or something is odd in the
> Linux implementation. There's six drives that can be used for reading
> at the same time, as they contain the very same data. 63MB/s
> sequential looks like what you would get from a single drive.

The RAID1 is correct.  As has been discussed on this list before, you will 
only see raid speed > 1 disk if you run 2(?, or 3 minimal) threads 
from the same device (raid1).

Justin.