Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site mit-eddie.UUCP Path: utzoo!watmath!clyde!cbosgd!ihnp4!mit-eddie!smh From: smh@mit-eddie.UUCP (Steven M. Haflich) Newsgroups: net.unix-wizards Subject: Dual porting UDA50 drives under 4.2 Message-ID: <3364@mit-eddie.UUCP> Date: Fri, 28-Dec-84 10:42:17 EST Article-I.D.: mit-eddi.3364 Posted: Fri Dec 28 10:42:17 1984 Date-Received: Sat, 29-Dec-84 03:11:28 EST Distribution: net.unix-wizards Organization: MIT, Cambridge, MA Lines: 17 I am considering dual porting RA81 drives between UDA50 controllers on separate machines to support data-intensive applications. Someone with detailed knowledge of these devices and driver could save me days of code-and-documentation reading: How does the UDA50 hardware handle a request on a drive which is busy executing a command from its other port, and would this condition blow away the standard 4.2 driver software? Also, does the hardware support dynamic locking of a drive by one or the other port under *program* (not pushbutton) control? Respond by mail and I'll summarize. But *please*, my question concerns details of hardware capability and driver support. I *don't* need to be told why Unix file systems cannot be mounted shared (unless both machines mount read only), etc. Thanks in advance. Steve Haflich {decvax!genrad,ihnp4}!mit-eddie!smh smh@mit-ems@mit-mc