This isn't strictly a filesystem question, but this seems like the best place to ask:

We have the following configuration:
  Secondary Master: Compact Flash (boot device, shows up as /dev/hd0)
  Primary Master: Fixed Hard Drive (shows up as /dev/hd1)
  Primary Slave: Removable Hard Drive (shows up as /dev/hd2)

All drives are supported by devb-eide.

The question is how to best manage the device removal and replacement. Under QNX4 we would umount /dev/hd2, then remove 
the drive. On replacement, we would mount -e /dev/hd2, then mount the partitions (no automount).

Does devb-eide support a removable drive? I know that /dev/hd2 did not appear after the drive was inserted the first 
time. It showed up after a reboot.

Worst case would be to shutdown the system whenever the drive needs to be inserted or removed. Other options might be 
shutting down the driver and restarting it as necessary, but I'm guessing I would have to first make sure I have 
separate driver invocations for primary and secondary, then umount both /dev/hd1 and /dev/hd2 before stopping the driver
.

Is there any facility for asking devb-eide to rescan the interfaces?

Any other suggestions?