Re: OFA Architecture with RAID

Steve,

I would disagree, you've just bundled the physical and logical performance metrics together - how would anyone be able to substantiate additional components in the disk subsystem ?

If you are forced to compromise on the disk subsystem physically, then you can help yourself by making the correct logical drive mappings.

Chris.
(It makes it a lot easier to diagnose random r/w and sequential r/w)

Steve Phelan wrote:
>
> No, you really only need one mount point, as the RAID devce will pull *all* the
> mount points onto one disk set anyway (as long as you created them all on the
> same RAID 5 set). If my whole system was on a RAID5 array (which may be a bad
> idea, but let's avoid that issue here) then you only have one file system mount
> point. Just create multiple directories on it to hold separate copies of things
> like redo mirror and control files, so you don't loose the lot if some hits
> delete in the a bad directory.
>
> Steve Phelan
>
> (Oracle 7 & 8 OCP)
>
> gremlin wrote:
>
> > Do you still need multiple (4?) mount points if your file system is on a
> > raid? Doesn't that take care of the thing you are trying to prevent
> > automatically?
> >
> > Mike
> >
> > Steve Phelan wrote:
> >
> > > OFA deals with having enough mount points to save you from a single drive
> > > failure. It doesn't include any RAID (or non-RAID) fault tolerant
> > > features. In other words, you don't have to follow OFA to the letter as
> > > you can build in some of it's features using your hardware.
> > >
> > > As regards which bits to put where, you'll really have to look at the
> > > uptime/recover-time you want plus the read/write performance of each part
> > > of your database you expect. None of this can be answered without a very
> > > good knowledge of your system.
> > >
> > > Read up on Oracle before you jump in on this, and get some consultancy.
> > >
> > > Steve Phelan
> > >
> > > (Oracle 7 & 8 OCP)
> > >
> > > Scott Patterson wrote:
> > >
> > > > I was wondering if anyone out there had any insights or suggestions on
> > > > how to configure a 7 disk compaq box running windows nt and Oracle
> > > > 8.05. I have read about the OFA architecture and wish to be compliant
> > > > along those parameters, but I am a bit confused how to also take
> > > > advantage of RAID technologies as well. I will have the ability to mix
> > > > and match different RAID levels along the 7 drives, however Im not
> > > > sure what OFA tablespaces should be say RAID1 and which should be
> > > > RAID5 or whatever other RAID levels should be considered. I generally
> > > > will be following the default tablespace schemas of the OFA
> > > > architecture.
> > > >
> > > > I would appreciate any insights on this subject,
> > > >
> > > > thanks Scott
> >
> > --
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Received on Tue Feb 23 1999 - 14:15:12 CST