On Thu, 06 Apr 2000, Sven Kirmess wrote:
> Thursday, April 06, 2000, 6:36:39 PM, David wrote:
>
> >>What about "IDE power down when idle"? Can this blow up the power
> >>supply or crash the system when turning on 4 disks simultaneous?
> > You don't want to use "power down when idle" on drives in a RAID...
>
> Why not? I think about power down after e.g. 30' idle time. Not after
> a few seconds... What's the Problem with RAID? Does it mark all disks
> as bad if they don't come up fast enough?
It definitely shouldn't. That would be a bug in the drive if you got
a read/write failure after power down.
On a home system where the disks can potentially be idle for a long
time, you could probably spin the disks down. On a production system
where users expect a prompt reply from the system, powering down the
disks is outright stupid.
But I fail to see how this relates to the size of the PSU ? All disks
must run when you use them, and if you need a 300W PSU to do that, you
can't use a 150W even if your disks are only in use 50% of the day.
(Obviously)
By the way, a lot of modern IDE drives have a jumper setting that
will delay their spin-up, so you could have your drives spinning up
only a few at a time to reduce the peak load, even with cheap disks.
At least some IBM disks has this feature (unsure about others)
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