If you are going to that level for performance
reasons, I would seriously consider using raw
partitions to avoid the issue.
hth
connor
- KC <kchan_at_speednet.com.au> wrote: > Kevin,
>
> Thanks for your input. I was trying to put certain
> datafiles on contiguous disk space, tell me if I am
> wrong, I try to avoid the situation where you want
> to create a 2G file, but the file system don't have
> a 2G contiguous space, so your flle is broken into
> multiple pieces, can that happen??
>
> KC
> -----Original Message-----
> From: Kevin Lange <kgel_at_ppoone.com>
> To: Multiple recipients of list ORACLE-L
> <ORACLE-L_at_fatcity.com>
> Date: Wednesday, June 20, 2001 1:22 AM
> Subject: RE: Disk configuration
>
>
> It all depends on what kind of os/filesystem/and
> disks you have. I know that under AIX, using SSA
> drives we could actually tell where on the disk we
> wanted the filesystem to go. This way we could
> position certain things in the faster location.
>
> But personally, I would not go thru the trouble.
>
> I have never had a DB slowdown so far because of
> placement on the drive. Admittadly, I have had
> probelms based on putting conflicting tables/indexes
> on the same drive .... you want to keep things that
> could be access simultaneously on different media.
> But other than that .... no other conflicts.
> -----Original Message-----
> From: KC [mailto:kchan_at_speednet.com.au]
> Sent: Tuesday, June 19, 2001 9:36 AM
> To: Multiple recipients of list ORACLE-L
> Subject: Disk configuration
>
>
> Dear List,
>
> Someone told me when a disk receive a write
> request, it write to the nearest free space on disk
> where the disk read/write head is currently
> positioning, is this information correct?? If this
> is true, is this a bad thing for database
> application?? That mean we can't really control
> where the file go, for performance purpose we may
> want to put certain files on the outer tracks of a
> disk, if the write location is depending on where
> the read/write head is, how can we avoid that, can
> we create subdisks from the outer track of a disk
> and create a logical volume from it??
>
> KC
>
Connor McDonald
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Received on Wed Jun 20 2001 - 02:34:41 CDT
