Andy R writes:
> --- Jeff Rizzo <riz@boogers.sf.ca.us> wrote:
> > On Mon, Nov 26, 2001 at 06:24:08PM -0800, Robert
> > Kennedy wrote:
> > > > 
> > > > 1) You can mirror the two drives using
> > raidframe...
> 
> Speaking of raidframe, it's a kernel level interface
> (like ccd), so you'll have to recompile the kernel
> anyway. If you're going to do that, move up to the
> latest... 1.5.2 has lots of things that are desireable
> over 1.3. 

Agreed.

> I wasn't aware that ccd did mirrors. I thought I read
> somewhere to the contrary...

It used to have (limited) support for mirrors... in NetBSDland, that 
code was ripped out once RAIDframe came along...

> I have a few questions about raidframe from a non
> engineer type to anyone that can answer. If I mirror a
> disk, does it become a full and true mirror? 

The "data section" of mirrored components are 'true mirrors'.  Things which 
don't live inside the data section (e.g. component labels, disklabels for the 
physical disk, MBR's, etc.) are not mirrored.

> Does it mirror the boot code and all? 

Since the boot code typically doesn't live inside the "data section" of the 
component, no.

> Can I use the mirror to boot off of?

With a bit of extra work you can boot off of the mirror.  It's not as 
straightforward as it might be, however.

>  Also, is there any provision to have it
> do parallel vs. sequential writes or is this not
> applicable?

Writes will happen in parallel (e.g. for a RAID 1 set, data will be written
to both components at the same time).
 
> I can hear the RTFM's in the distance already...
> 
> Andy
> 
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Later...

Greg Oster