Hello folks.  We're trying to build a fairly large RAID array of IDE
disks on a NetBSD 1.4.2 system using Promise Ultra DMA PCI IDE controllers.
 We've got 3 Promise cards with 4 drives each, for a total of 12 drives for
the array, plus the onboard Motherboard IDE for the boot disk.  The machine
seems to boot fine, but after a few minutes of operation, all activity
comes to a halt and everything seems to hang.  While this arrangement of
drives and cards seems reasonable, I have never tried to run 7 IDE busses
in one machine at the same time.  Are there limitations in the drivers,
that people are awareof, which could hamper our effort on this project?
Would 1.5 work better in this respect?  Does anyone have any experience
with trying to pack so many drives in one case?
-thanks
-Brian