Re: ASM setup

From: macdba321 <>
Date: Mon, 28 Apr 2008 10:18:55 -0700 (PDT)
Message-ID: <>

On Apr 28, 12:45 pm, hpuxrac <> wrote:
> On Apr 28, 10:26 am, macdba321 <> 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.

Thanks for the reply! I actually just got the book you recommended and since (for once) I have some spare time and some spare hardware, I'm playing around with it as I read along.

Regardless, since this is all 100% for fun/academic, a quick question:

If you were setting up a server/database for 100% speed (ie, ZERO requirements for HA and/or disaster recovery .....if I lose a drive, oh well, I start over, etc.):
(The server has 3 raw disks)
Would you:

  1. Hardware-based RAID-0 the 3 disks and let ASM see them afterwards as 1 "device"
  2. Oracle-based RAID-0 the 3 disks
  3. Don't use RAID at all
  4. Other????

Thanks, and again, this is 100% academic/fun .... this is ZERO

requirement for High Avail!!!!!!!!!!!!!!!!!!!!!!

Thanks! Received on Mon Apr 28 2008 - 12:18:55 CDT

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