Jens Axboe wrote:
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.
Sounds about right, but clearly longer than the 2 sec mentioned early in
this thread. I think a long delay is okay as long as it gets stopped
when the drive does come ready.
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.
I try *very* hard not to do bootup on servers, the paperwork involved
with an outage takes longer than the boot time ;-)
--
bill davidsen <[email protected]>
CTO TMR Associates, Inc
Doing interesting things with small computers since 1979
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