"John Compton" <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > (I don't know if this has been discussed before - tried to search the > archives, but either there's nothing there, or I chose bad search > arguments). > > Back in the days of old (when sysprogs were bold, etc.) we'd spend many > happy(?) hours tinkering with the physical placement of files in order to > tune the I/O response time of the DASD farm. > > Then along came RAID arrays. >
You skip one historic event: Cache in control units. Since this, the physical place of your critical datasets on the disks became less important, because the were probably served from the cache, making them independent of arm movement and other physical delays. Kees. ********************************************************************** For information, services and offers, please visit our web site: http://www.klm.com. This e-mail and any attachment may contain confidential and privileged material intended for the addressee only. If you are not the addressee, you are notified that no part of the e-mail or any attachment may be disclosed, copied or distributed, and that any other action related to this e-mail or attachment is strictly prohibited, and may be unlawful. If you have received this e-mail by error, please notify the sender immediately by return e-mail, and delete this message. Koninklijke Luchtvaart Maatschappij NV (KLM), its subsidiaries and/or its employees shall not be liable for the incorrect or incomplete transmission of this e-mail or any attachments, nor responsible for any delay in receipt. ********************************************************************** ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
