Subject: Re: RAID, ccd, and vinum.
To: Richard Rauch <rkr@olib.org>
From: Greg Oster <oster@cs.usask.ca>
List: netbsd-help
Date: 12/21/2004 11:50:05
Richard Rauch writes:
> On Tue, Dec 21, 2004 at 10:11:15AM -0600, Greg Oster wrote:
> > Richard Rauch writes:
> [...]
> > > Then when I went to try vinum (missing/unconfigured device,
> > > even after building a kernel with vinum support), and RAID, I left
> > > the disklabels alone (1648 offsets).
> >
> > Just a sec... the disklabel on wd1/wd2 or the disklabel on raid0/ccd0?
> > It's the disklabel on raid0 that I care most about - the labels on
> > wd1/wd2 don't matter. :)
>
> Oh. raid0a is offset at 0, and uses the whole volume. That was
> the default.
Ok, good. The concern is that if it wasn't stripe-aligned, a given
64K (or 32K) write might actually span across disks/stripes,
requiring about 2x the overhead and 2x the number of IOs.
Later...
Greg Oster