On Thu, Apr 15, 2004 at 08:33:14AM -0500, Greg Miller wrote:

> support that. The FreeBSD folks tried to solve this by turning off write 
> caching by default. Unfortunately, this hurt performance so much they 
> had to turn it back on and just recommend SCSI drives for important data.

Why, do SCSI drives all come with battery-backed cache?  (So when you
power them up again they complete the old cached write.)  I didn't
think so, but would be pleased to learn otherwise...

Is there any device available which basically serves as an add-on UPS
for hard drives?  Something you'd just plug all your IDE drives into,
and it would keep the drives going just long enough after a power fail
to finish writing their cached data and spin down cleanly?  AFAIK no
such device is available, but if reasonably priced it sure would be
nice to have.

Of course, with a good UPS *AND* the proper software running to react
to signals from the UPS, you get that sort of protection for free, and
you certainly want the system UPS anyway.  But that's also much more
complicated and vulnerable to failures due to misconfigured software,
so it'd sure be nice to have the hard-drive-UPS as well.

Andrew Piskorski <[EMAIL PROTECTED]>

To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]

Reply via email to