Do Disk Heads Stay in the Begining or Middle of a disk when idle ?

From: Bass Chorng <bchorng_at_yahoo.com>
Date: 3 Jul 2002 15:53:09 -0700
Message-ID: <bd9a9a76.0207031453.3d32bf84@posting.google.com>

In ixroa Steve Adams' Disk Configuration for Online Redo Logs, he stated that log files should be located in the begining of a disk to minimize disk arm movement.

In IBM's Shark documentation, it states that log files should be located in the middle of a disk to minimize access time.

Years ago, I remember Informix DBA guide stated that the physical logs
( = rollback segments) and logical logs ( = redo) should be located in the
middle of a disk because disk heads hover above the middle section of a disk once it is powered on.

Does anybody know which is right ? Or does it depend on the disk manufacturer
( I really doubt that though ) ?
Received on Wed Jul 03 2002 - 17:53:09 CDT