Re: [git patch] libata resume fix

[Jens Axboe]

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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