Planning for disk space

You must plan for flexible data storage as part of your server solution. A complete plan includes both independent disk pools (also known as independent auxiliary storage pools) and switchable disk units.

Before you begin with the main planning tasks, you need to gather this information:

Before you begin
__ Have a schematic of all of the current disk storage that details how the storage is attached.
__ Quantify available disk storage.
__ Have a list of disk requirements for both applications and data.
Disk planning tasks
__ Plan for physical disks

Calculate the amount of storage that you need initially and develop an upgrade path that allows for additional disk drives to be added later. Determine how each drive will be attached, what type of drive it is (for example, SCSI), and what its function is in the overall solution.

See the Disk topic to effectively plan for disk storage requirements, independent disk pools, and switchable disk units. Also see the Disk Drives Link outside information center Web site for a list of drives that you could use as part of your solution.

__ Plan for disk partitions

On AIX® and Linux® systems you can divide your hard disks into partitions. Each disk can have a number of partitions on it, which allows you to separate system recovery software from other applications, for example. For each disk, you need to determine the size and quantity of partitions. Allow for future reconfiguration of your disk partitions where necessary.

After you finish
__ Record a list of disks that must be added and how those disks will be attached.
__ Record a disk partition plan that shows where partitions data and applications reside, if applicable.
__ Identify an upgrade path for future disk storage needs.