Re: ASM setup

On Apr 28, 9:39 pm, macdba321 <macdba..._at_gmail.com> wrote:
> On Apr 28, 12:45 pm, hpuxrac <johnbhur..._at_sbcglobal.net> wrote:
>
>
>
> > On Apr 28, 10:26 am, macdba321 <macdba..._at_gmail.com> wrote:
>
> > > Hi all,
> > > I'm setting up my first ASM based database ever. (Just for testing
> > > and learning, NOT for production). I only have 3 physical disks in the
> > > ASM disk group. (4 total physical disks in the server).
>
> > > I am loading the OS (Windows 2003 server) on one physical disk as
> > > well as the Oracle installation. I am keeping the other 3 disks raw
> > > for ASM.
>
> > > Should I RAID the 3 raw disks (hardware RAID and/or Oracle raid) or
> > > just let Oracle do what it wants with them?
>
> > > Thanks!
>
> > What most people do in the real world ( the ones actually using ASM
> > anyhow ... not a large percent yet of the oracle installed base ) is
> > basically this.
>
> > If your storage environment supports RAID well then they get LUNs from
> > it and define the ( LUNs become disks in an ASM diskgroup ) diskgroup
> > as external redundancy.
>
> > This tells ASM hey don't bother doing any overhead of mirroring the
> > extents you allocate across disks ... my storage environment does a
> > nice job of dealing with that stuff.
>
> > If the storage environment doesn't support RAID then they point ASM at
> > disks and let ASM do the mirroring, You have a choice of 2 or 3 way
> > mirroring to add additional protection levels.
>
> > So all in all this design is up to you ... perhaps it should be based
> > on the type of testing that you want to do and how that relates to an
> > eventual production environment that you might be running in
> > eventually.
>
> > There's a book that you might want to think about getting "Oracle
> > Automatic Storage Management" it's one of those Oracle Press books
> > authors are Vengurlekar, Vallath and Long includes 10g and 11g.
> > Personally I recommend getting and reading that book ( it really isn't
> > that long ) and spending a day or 2 reading it before you make more
> > decisions about your setup.
>
> Hello, apologies if you receive this reply twice (It didn't reply
> successfully the 1st time).
>
> I just got the book you recommended and am playing with the database
> server as I go along for fun (since for once I have time on my hands).
>
> The database server has 3 raw disks for me to "play" with.
>
> This is 100% academic/fun. There is ZERO need for High Availability/
> redundancy. If I lose a drive, oh well, I start over. It doesn't
> matter.
>
> One quick question:
>
> If you wanted to set it up for 100% performance/speed, would you:
>
> A) Hardware-based RAID-0 the 3 raw disks as 1 ASM disk group,
> B) Oracle-based RAID-0 the 3 raw disks for ASM
> C) Some other RAID level?
> D) Other???
>
> Thanks!!!!!!!

I'd do D): one spindle for ASM DG1 dedicated for redo logs and possibly a copy of control file (yes, it's going to be tremendous waste of space, but you wanted speed, didn't you? ;) and two spindles striped with hardware RAID-0 for ASM DG2, where the database (in NOARCHIVELOG mode!) and flash recovery area would be. Both disk groups would be with external redundancy to minimize mirroring overheads; separate spindle dedicated for redo should minimize the i/o component of redo log sync times. This setup automatically offers zero data protection as requested. :)

My $0.02,

   Vladimir M. Zakharychev
   N-Networks, makers of Dynamic PSP(tm)    http://www.dynamicpsp.com Received on Mon Apr 28 2008 - 13:57:20 CDT