Power Management PM7500

[Mark Alway]

I have a PowerMac 7500 that has been running an Apache Web server and
MySQL Database server for several years.  It's still on YDL 2.4 with 
linux kernel 2.4.18-0.9a. The thing runs non-stop and the hard drive is
continually spinning.  I'm worried after 2.5 years of non-stop usage 
that the hard drives will get worn out.  Is there any power management 
options within YDL 2.4 or 3.0 (Looking forward to upgrading) that will 
spin down a SCSI hard drive in a 7500 when not in use?  The fan spinning 
down would also be nice as those older machines are loud.  I would need 
it to wake on network activity such as a Web GET request or SSH connection.

Thanks,
Mark