Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!rochester!ur-tut!sunybcs!rutgers.rutgers.edu!sri-unix!sri-spam!mordor!lll-lcc!unisoft!mtxinu!ed From: ed@mtxinu.UUCP (Ed Gould) Newsgroups: comp.bugs.4bsd,comp.unix.wizards Subject: Re: Cant access disks on second UDA50 Message-ID: <462@mtxinu.UUCP> Date: Mon, 20-Jul-87 02:52:06 EDT Article-I.D.: mtxinu.462 Posted: Mon Jul 20 02:52:06 1987 Date-Received: Tue, 21-Jul-87 04:40:15 EDT References: <6683@dartvax.UUCP> <441@eplrx7.UUCP> Reply-To: ed@mtxinu.UUCP (Ed Gould) Organization: mt Xinu, Berkeley Lines: 77 Keywords: unibus uda50 Xref: mnetor comp.bugs.4bsd:457 comp.unix.wizards:3324 >> For testing purposes, we moved 2 RA81s from uda0 to uda1, so in terms of the >> config file we went from this... >> controller uda0 at uba0 csr 0172150 vector udintr >> disk ra0 at uda0 drive 0 >> disk ra1 at uda0 drive 1 >> disk ra2 at uda0 drive 2 >> disk ra3 at uda0 drive 3 >> ...to this... >> controller uda0 at uba0 csr 0172150 vector udintr >> disk ra0 at uda0 drive 0 >> disk ra1 at uda0 drive 1 >> controller uda1 at uba0 csr 0172550 vector udintr >> disk ra2 at uda1 drive 2 >> disk ra3 at uda1 drive 3 >I have 2 uda's running on several MicroVaxes, and they all run fine. I >suspect that it's you config that may be wrong. Each uda can support 4 >devices, and you have to (or should) tell config about them. So, your >config should look like this: >controller uda0 at uba0 csr 0172150 vector udintr >disk ra0 at uda0 drive 0 >disk ra1 at uda0 drive 1 >disk ra2 at uda0 drive 2 >disk ra3 at uda0 drive 3 >controller uda1 at uba0 csr 0172550(or 0160334) vector udintr >disk ra4 at uda1 drive 0 >disk ra5 at uda1 drive 1 >disk ra6 at uda1 drive 2 >disk ra7 at uda1 drive 3 >In your configuration, you're asking unix to find ra2 on uda1 drive 2. >This is not logically possible. Close, but not quite. The correct config would be controller uda0 at uba0 csr 0172150 vector udintr disk ra0 at uda0 drive 0 disk ra1 at uda0 drive 1 controller uda1 at uba0 csr 0172550 vector udintr disk ra2 at uda1 drive 0 disk ra3 at uda1 drive 1 The config file defines a mapping between logical names (ra0) and physical names (uda0, drive 0). This mapping is essentially arbitrary. In order for another mapping (names in /dev to device numbers) to remain untouched by this experiment, it is important to maintain the names ra2 and ra3 for the two drives that were moved. Otherwise, the entries in /dev would need to be changed. There is no need to describe devices that do not exist, nor is there a need to reserve names for them. (Sometines, though, it is convenient to do so.) The entire (new) mapping may be summarized as follows. Note that there are eight minor devices for each physical disk. /dev/ra0? => (9, ( 0- 7)) == ra0 => uda0 drive 0 /dev/ra1? => (9, ( 8-15)) == ra1 => uda0 drive 1 /dev/ra2? => (9, (16-23)) == ra2 => uda1 drive 0 /dev/ra3? => (9, (24-31)) == ra3 => uda1 drive 1 | | | | ------------ | | | | physical name | | | --------- logical name | | ------------------- minor device number | ------------------------- major device number --------------------------------------- name in file system -- Ed Gould mt Xinu, 2560 Ninth St., Berkeley, CA 94710 USA {ucbvax,decvax}!mtxinu!ed +1 415 644 0146 "A man of quality is not threatened by a woman of equality."