On Wed, May 31 2006, Robert Hancock wrote:
> Bill Davidsen wrote:
> >The trade-off is that if I have a 15k rpm SCSI drive, it would take a
> >lot of design changes to make it spin up quickly, and improve a function
> >which is usually done on a server once every MTBF when replacing the
> >failed unit.
> >
> >I think the majority of very large or very fast drives are in systems
> >which don't (deliberately) power cycles often, in rooms where heat is an
> >issue. And to spin up quickly take a larger power supply... 30 sec is
> >fine with most users.
> >
> >Couldn't find a spin-up time for the new Seagate 750GB drive, but the
> >seek sure is fast!
>
> I wouldn't guess that even a 15K drive would take nearly that long. For
> boot time on servers it doesn't matter much though, disk spinup time is
I do use a 15K rpm drive in my workstation (hello git!), and the spin up
really isn't that bad. Less than 10 seconds for the actual spin up, I
would say.
> in the noise compared to the insane BIOS delays on most of them during
> bootup. Like on some servers (ahem.. IBM) which have about a 15 second
> delay on the main BIOS screen, 10 second delays on every network boot
> ROM, a 1 minute delay on the SCSI controller before it even starts
> scanning the bus, then another good 10 seconds before it starts booting.
> Gets annoying after a few reboots..
Indeed, the BIOS bootup time on servers is typically anywhere from
really bad to truly awful.
--
Jens Axboe
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