task: replace failing disk drive in RedHat 9 server (software RAID)
risk: site downtime, data loss, sleep loss, hair loss
step 1: test RAID disk swap procedure on spare hardware
 - oops, spare hardware runs RH7. Begin upgrade.
 - oops, RH9 CD won’t boot. Try bootdisk image.
 - oops, networking dies during image download?
 - restart networking. download. repeat.
 - finally, make bootdisk.
 - make a driver diskette too.
 - scan CD during install. Scan fails. Need new RH9 CD.
 - Download CD image to laptop.
 - oops, browser puked. Force-quit; retry.
 - oops, browser puked. Reboot.
 - oops, browser puked. Force-quit. Try a different browser.
 - Burn CD-ROM from image.
 - Repeat for CD#2.
 - finally, begin installation from floppy and CD-ROM.
 - can’t select RAID options with keyboard. Find mouse.
 - oops, mouse not recognised. back up; try again.
 - mouse still not recognized. Reboot; try again.
 - finally, installation (graphical mode) is working.
step 2: to be continued?
 - unfortunately, yes.