If your server uses mirroring or an implementation of a RAID-5 technique on the disk units in the system ASP, your installation time can be longer.
This amount of time will vary depending on your configuration, but if the disk units are protected with RAID-5, the total installation time (for Licensed Internal Code, the i5/OS™ operating system, and licensed programs) will be approximately 15 percent longer. If the disk units are mirror protected, the total installation time will be approximately 10 percent longer. Mirroring and implementations of the RAID-5 techniques do not affect the duration of save operations.
Using the percents given, include a time estimate for your server in Checklist: Estimating installation time.