[Info-vax] RAID vs. MOUNT/BIND

[H Vlems]

On 18 nov, 09:32, hel... at astro.multiCLOTHESvax.de (Phillip Helbig---
undress to reply) wrote:
> In article <ic1esf$lg... at pcls6.std.com>, moro... at world.std.spaamtrap.com
>
> (Michael Moroney) writes:
> > hel... at astro.multiCLOTHESvax.de (Phillip Helbig---undress to reply) writes:
>
> > >With host-based RAID, do I have the option of a) binding several small
> > >shadow sets into a larger RAID 0 device or b) shadowing two (or more)
> > >RAID 0 devices?  If so, which is better?
>
> > The wisdom is to make stripe (RAID 0) sets from shadowsets, not shadow
> > stripe sets. This is due to failure possibilities. One failed drive in a
> > stripe set takes out the whole stripe set.  If you shadow two stripe sets,
> > two failed drives (one in each stripe set) takes out the whole thing.  If
> > you stripe shadowsets, two drive failures can still take out the whole
> > thing, but only if they both are part of the same shadowset.
>
> OK, right, of course.  Replace RAID 0 with RAID 5: same question.
>
> > The same logic would apply to volume sets, if you decide to go that route,
> > however you actually don't have a choice since you can't shadow volume
> > sets, just its members.
>
> OK, so here one can do only the right thing.  :-)

In a RAID-0 and RAID-1 combination it is possible to leave the