Re: Which RAID level?

My understanding is that Raid 0+1 (striping and mirroring) is best for performance and the most expensive. Raid 5 is OK but suffers from some performance penalty during writes. I am sure that you are going to get a lot of advice on this subject, so for the next person, if you know the answer could you explain the difference between 0+1 and 1+0? I know that one is preferred over the other but not sure how or why.

Thanks,

Carlos.
In article <37AB0AD9.311E2E9C_at_us.oracle.com>,   Steven Poe <spoe_at_us.oracle.com> wrote:
> Breno,
>
> I don't believe it is so much the database itself, but how safe do
you want
> your data? RAID0 will allow you to stripe across all your drives
with no
> redundancy. If one drive fails, it is dead. RAID1 is a mirror of
your
> main drive(s). You can run, or should be able to, run RAID1 on top of
> RAID0. RAID5 allows for rundundancy/CRC checks so if one drive dies,
the
> other drives keep working. I speaking from my experience with Linux,
I
> think NT would be the same, but I cannot assure you of that. If you
have
> nightly/backups, you *may not* need a mirror (RAID1) but that will
also
> depend on the availability of your database too. There can be
arguments
> for each case.
>
> -Steven Poe
>
> Breno de Avellar Gomes wrote:
>
> > I am about to install high availability Oracle8i FailSafe using SMP
and
> > RAID Compaq Servers (Intel) running NT 4.0.
> > Some DBA advised me to use RAID level 0/1, others 5. It seems to be
> > controversial.
> >
> > Wich level is more adequate? Why should I use one instead another?
> >
> > Thanks in advance
> >
> > Breno
>
>

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Share what you know. Learn what you don't. Received on Fri Aug 06 1999 - 17:24:56 CDT