We should keep in mind that Robert is comparing RAID 5 with a
"concatenated mirror", which from a performance standpoint is basically
comparing "striping w/parity overhead" with "no striping."
Robert, if you're considering a concatenated mirror, why not a striped
mirror instead? (same amount of disk use and loss protection, but with
consistently better performance)
HTH
rob
--- James Mello <kingjamm AT colltech DOT com> wrote:
> > Performance used to dictate that a mirrorred set was faster.
> However if you
> > are running with any of the newer raid controllers the difference
> is
> > negligable.
>
> It looks like he's using software volume management for his RAID
> set.... In general, it just depends on the amount of data that is
> being
> written to disk. If you've got a backup server doing 100's of backups
> with
> lots of logging, then RAID 5 is a *bad* idea. If it's just a small
> shop
> only backing up a couple of servers, go for it. The savings would be
> worth it.
>
> There is price, performance, and relability.... pick 2....
>
> > I'm setting up a file system for /usr/openv using volume manager
> with
> > four disks, and I'm wondering if it would be better to make it a
> raid5
> > system, or a concatenated mirror. If I use mirroring, then my disk
> > space is limited to that of the two disks, but with raid5, I get an
> > extra disk space. For performance reasons, what would be the best
> > layout of disks?
> >
> > thanks
> > robert
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> > _______________________________________________
> > Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> > http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
> >
>
> _______________________________________________
> Veritas-bu maillist - Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
__________________________________________________
Do You Yahoo!?
Find a job, post your resume.
http://careers.yahoo.com
|
