> -----Original Message-----
> From: James Manning [mailto:[EMAIL PROTECTED]]
> Sent: Sunday, April 16, 2000 9:07 AM
> To: Werner Reisberger
> Cc: [EMAIL PROTECTED]
> Subject: Re: Combining RAID 0 and RAID 1
>
[snip]
>
> Recovery is a tad simpler with raid1 done at the lower level simply
> because none of the md device ever "dies", just one falls
> into degraded
> and you can skip an mkraid and let normal recovery take over.
> Of course,
> that leaves the raid1 read balancing algorithm (arguably the
> weak point in
> the read performance of 0+1 or 1+0) running in two places
> instead of one.
Could you elaborate a little? Are you talking about the default 0.90 code,
or patched with Mika's brilliant patch? Theoretically, RAID1+RAID0 should
be extreemly fast for reads, and only a bit slower for writes, assuming that
you're not saturating the bus.
Greg
