Re: RAID 5/Oracle

Hi,

that's correct. The rule of thumb is that RAID5 is usually the "Sys Admin's choice" whereas the "DBA's choice" is more like 1-controller-per-disk-per-datafile ;)

James Howerton schrieb:
>
> I lost the battle. We have Hitachi raid 5 hooked-up to a Sun E10K and write
>performance does "SUCK"!!!
> Maybe "THEY" will listen next time;-)...
>
> ...JIM...
>
> >>> kevin_at_dulcian.com 8/1/01 10:36:01 AM >>>
> doesn't write performance kind of suck too?
> KK
>
> -----Original Message-----
> Jahnke
> Sent: Wednesday, August 01, 2001 10:02 AM
> To: Multiple recipients of list ORACLE-L
>
> Ravindra Basavaraja schrieb:
> >
> > We are planning to move our database to Sun 4500 with A1000(RAID 5).Our
> > system admin group has been
> > working on this setup and I was told that the A1000 which is having 4
> disks
> > will be seen as just as
> > one mount point after configuration.Is this the correct way of
> > confuguration.Don't we see each disk
> > of A1000 as different mount point.
> >
> > Thanks
> > Ravindra
> >
>
> Hi,
>
> if you setup a group of disks as a RAID5 disk array, they appear as one
> logical unit. Hence, you only see one single mount point. Advantages:
> Read access is usually faster, since the data is transparantly
> distributed to your disks by the RAID system. It's another step towards
> higher availability since RAID5 usually gives you the feature of
> replacing a damaged disk while the file system keeps operating.
> Disadvantage: You don't have that much control over the degree of
> fragmentation since the data distribution is done by the RAID system.
>
> ----------------------------
> | Regards, |
> | Stefan Jahnke |
> | @:D2 Vodafone, Abt.: FBOM |
> ----------------------------
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> Author: Stefan Jahnke
> INET: stefan.jahnke_at_d2vodafone.de
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> Author: Kevin Kostyszyn
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-- 
 ----------------------------
| Regards,                   |
| Stefan Jahnke              |
| BOV AG                     |
| @:D2 Vodafone, Abt.: FBOM  |
| Tel.: 0211/533-4893        |
 ----------------------------
-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Stefan Jahnke
  INET: stefan.jahnke_at_d2vodafone.de

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