Parallel HDSpin Up
- Hard drive spinup is one of the most costly operations during startup. - Can start HD in firmware prior to kernel load - Obviously, kernel can't reside on HD - Requires separate storage for kernel (and possibly other init programs)
How to implement or use
[describe how to achieve the technique (config options, command args, etc.)]
The expected improvement in bootup times from using this technique depends (of course) on the time is takes for the hard disk to spin up. For some systems, the hard disk spinup time dominates the boot up time. In this case, the time saved is approximately the time of the kernel initialization.
|Brand||Size||Time to Ready|
|Seagate||3.5"||6.5 - 10 seconds *|
|Hitachi||3.5"||6 - 10 seconds *|
|Hitachi||2.5"||4 - 5 seconds|
|Hitachi microdrive||1.0"||1 - 1.5 seconds|
- depends on the number of platters
During retries, these times can be extended by 10's of seconds, but this is rare.