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AIX has a unique concept of this.
Given data spread on a disk. The head will spend more time over the
middle tracks as it seeks data that is distributed across the disk.
Thus for faster access, place your tablespace on the middle tracks
of a disk because the probability that the head will be over it is
much greater.
Learned this with Syabase on AIX. It may still hold true today.
I don't know. Technology had advanced a lot from those day. (But I think the
laws of physics are the same ;-))
-----Original Message-----
Sent: Friday, September 14, 2001 10:05 AM
To: Multiple recipients of list ORACLE-L
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Christopher R. Spence said:
"Disks are cheap and if you store things on the outer platters performance
will suffer"?
Chris, I'm not sure what you mean here.
The concept of Variable Transfer Rate covers this.
Stealing a quote from: Optimal Storage Configuration Made Easy,
By Juan Loaiza, Oracle Corporation
"The transfer rate for a disk drive is not the same for all portions of a
disk.
The outer sectors of a disk drive move by the disk head faster than the
inner sections
leading to a faster transfer rate for the outer sectors. This is simply
because
of the circular shape of a disk drive."
Scott
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