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OSP #2b: Build a Standard Platform from the Bottom-Up

This is the fourth of twelve articles in a series called Operationally Scalable Practices. The first article gives an introduction and the second article contains a general overview. In short, this series suggests a comprehensive and cogent blueprint to best position organizations and DBAs for growth.

OSP #2b: Build a Standard Platform from the Bottom-Up

This is the fourth of twelve articles in a series called Operationally Scalable Practices. The first article gives an introduction and the second article contains a general overview. In short, this series suggests a comprehensive and cogent blueprint to best position organizations and DBAs for growth.

What would you do with 8 disks?

Yesterday, David Best posted this question at Oracle-L:

If you had 8 disks in a server what would you do? From watching this list I can see alot of people using RAID 5 but i'm wary of the performance implicatons. (http://www.miracleas.com/BAARF/)

I was thinking maybe RAID 5 (3 disks) for the OS, software and
backups. RAID 10 (4 disks + 1 hot spare) for the database files.

Any thoughts?

I do have some thoughts about it.

There are four dimensions in which I have to make considerations as I answer this question:

  1. Volume
  2. Flow
  3. Availability
  4. Change

Just about everybody understands at least a little bit about #1: the reason you bought 8 disks instead of 4 or 16 has something to do with how many bytes of data you're going to store. Most people are clever enough to figure out that if you need to store N bytes of data, then you need to buy N + M bytes of capacity, for some M > 0 (grin).