Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA Path: utzoo!linus!philabs!cmcl2!seismo!brl-tgr!tgr!young@AMES-NAS.ARPA From: young@AMES-NAS.ARPA (Bruce Young) Newsgroups: net.unix Subject: Re: SI shared disk system Message-ID: <8954@brl-tgr.ARPA> Date: Tue, 5-Mar-85 14:36:20 EST Article-I.D.: brl-tgr.8954 Posted: Tue Mar 5 14:36:20 1985 Date-Received: Sat, 9-Mar-85 19:03:37 EST Sender: news@brl-tgr.ARPA Lines: 25 re: SIMACS SIMACS is supported for each os SV or 4.2, BUT you cannot share disks between two different os YET. Eventually, SI will attempt separate file directories with common storage. (End of speculation.) Ask about the SIMACS kernal modifications to provide locks on file accesses. The host accessing shared disks must own the system disk during the access. This means all dirty buffers from the previous owner host must be flushed. thus, be certainto check benchmarks for interactive traffic; eg, any screen editor when run on multiple hosts. One merit, naturally, of SIMACS is access to the shared disks from another computer when your favorite host is down. However, ask SI about changing ownership of the ? Conclusion, SI persues essential system needs but check all benchmarks and kernal modifications. -Bruce young@AMES-NAS.ARPA