Messages in this thread |  | | | Date | Thu, 1 Jun 2006 15:48:04 +0200 | | From | Jens Axboe <> | | Subject | Re: [git patch] libata resume fix |
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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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