Re: vinum and qmail (RE: qmail IO problems)

[Greg Lehey]

On Wednesday,  7 February 2001 at 13:31:26 -0800, Matt Dillon wrote:
>
>     In anycase, while VINUM is great for striping disks I recommend that
>     you use CCD to begin with, because CCD is a whole lot less complex.
>     You can stripe IDE drives but the two drives must be on different IDE
>     controllers (not just primary secondary, but each drive must be primary
>     on its own controller).  Then striping will help.

I'd contest that.  I find configuring ccd very confusing.  But recall
that error recovery with ccd is extremely primitive.  With Vinum you
can add mirroring on the fly, and if a mirror dies, the volume carries
on running.

>     Of course, I would not recommend using IDE at all if you are
>     pushing 600MB/day in mail.  You really should be using a SCSI
>     based system...  something like the VALINUX boxes (running
>     either Linux or FreeBSD).

If you have only one drive per IDE controller, performance can be very
good.  You definitely don't want more than one drive, though.

Greg
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