Re: With 4 disks should I go for RAID 5 or RAID 10

In response to Mark Mielke <mark(at)mark(dot)mielke(dot)cc>:

> Bill Moran wrote:
> > In response to Mark Mielke <mark(at)mark(dot)mielke(dot)cc>:
> >
> >
> >> Bill Moran wrote:
> >>
> >>> I'm fairly sure that FreeBSD's GEOM does. Of course, it couldn't be doing
> >>> consistency checking at that point.
> >>>
> >> According to this:
> >>
> >> http://www.freebsd.org/cgi/man.cgi?query=gmirror&apropos=0&sektion=8&manpath=FreeBSD+6-current&format=html
> >>
> >> There is a -b (balance) option that seems pretty clear that it does not
> >> read from all drives if it does not have to:
> >>
> >
> > >From where did you draw that conclusion? Note that the "split" algorithm
> > (which is the default) divides requests up among multiple drives. I'm
> > unclear as to how you reached a conclusion opposite of what the man page
> > says -- did you test and find it not to work?
> >
> Perhaps you and I are speaking slightly different languages? :-) When I
> say "does not read from all drives", I mean "it will happily read from
> any of the drives to satisfy the request, and allows some level of
> configuration as to which drive it will select. It does not need to read
> all of the drives to satisfy the request."

Ahh ... I did misunderstand you.

--
Bill Moran
Collaborative Fusion Inc.
http://people.collaborativefusion.com/~wmoran/

wmoran(at)collaborativefusion(dot)com
Phone: 412-422-3463x4023