Re: Physical disks vs Logical drives for RAID on OracleNT

SH,

If you have one disk, then you are covered if your file becomes corrupt, because you have more than one copy of it. But if you lose the disk then
you are down totally. And who knows if you can get any data off of it period. If you lose the controller then you are down until that controller
can be replaced. However if you have several disks and several controllers
then you can lose some of them without much impact. You would have to tell
OS that you want to stop mirroring and reboot. Of course you go back down
again when you replace the disk or controller but it is definitely more controlled that way. It is money -vs- downtime etc.

Good Luck,
Jennifer Mead

shan168 wrote:
>
> Hi,
>
> I have a Compaq Proliant server with 5x4.3gb RAID disks. I have decided to
> configure them to Raid-1 (mirrored set) for redo logs, control files, NT OS,
> and oracle software, and Raid-0 for data files (RBS, data, temp, ...).
>
> Now my question is: how many PHYSICAL disks should I create? I know Oracle
> recommends as many physical disks as possible. However, according to my
> research, some people say since RAID-0 stripes data accross several disks,
> there is no need to create independent disks, i.e. one large disks with
> several logical drives will be good enough. Which one is correct?
>
> Any suggestions will be appreciated.
>
> S.H.
>
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Received on Mon Apr 05 1999 - 16:29:33 CDT