Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!cornell!batcomputer!itsgw!steinmetz!uunet!ndsuvax!ncbergst From: ncbergst@ndsuvax.UUCP (Troy Bergstrand) Newsgroups: comp.unix.wizards Subject: Emulex UD33 - DEC UDA50 Keywords: unibus disk adapters Message-ID: <1030@ndsuvax.UUCP> Date: 13 Jul 88 21:17:53 GMT Organization: North Dakota State University Fargo, ND Lines: 33 We just installed Emulex's UD33 disk controller on our VAX 780. But unfortunately the installation did not complete without incident. Our configuration: Vax 11-780 12 Megabytes of memory 2 Unibus controllers Unibus 1: UDA33 - 2 RA81, Interlan Ethernet Controller Unibus 2: 11 DMF32's, 1 DH We are running 4.3BSD Unix with no modifications to the uda or unibus code. We desired to put both the UD33 and the UDA50 on the same unibus, Emulex tells us this should work, but it didn't. After setting the UDA50 jumpers to the longest possible (10ms) DMA delay and setting the UD33 in the same way and also reconfiguring the kernel to place the UD33 at different unibus addresses we also got the same result. That result was a hanging of the system on disk i/o. I could run systat -vm and watch the disk requests and after a period of time there would arise some situation where at least one of the disk requests would not or could not be serviced. After which near every other process on the system would get stuck in the request queue behind the hung process. So to get the new drive working we put the UD33 on the unibus 2 with the communcation controllers and everything is ok there. Has anyone succesfully installed a UD33 on a 4.3BSD unix system on the same unibus as an UDA50? -- J. Troy Bergstrand North Dakota State University, Fargo, ND 58105 UUCP: ...!uunet!ndsuvax!ncbergst BITNET: ncbergst@ndsuvax.bitnet ARPA,CSNET: ncbergst%ndsuvax.bitnet@cunyvm.cuny.edu