Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10 5/3/83; site rayssd.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!rayssd!dhb From: dhb@rayssd.UUCP Newsgroups: net.unix-wizards Subject: File system limit in 4.2 BSD Message-ID: <681@rayssd.UUCP> Date: Fri, 29-Mar-85 16:05:45 EST Article-I.D.: rayssd.681 Posted: Fri Mar 29 16:05:45 1985 Date-Received: Sun, 31-Mar-85 02:34:22 EST Distribution: net Organization: Raytheon Co., Portsmouth RI Lines: 32 Has anyone ever successfully gotten more than 15 file systems on a 4.2 BSD system? After many long delays, we are finally going to convert from 4.1 to 4.2, and we need to be able to mount more than 15 file systems. I tried making the same changes that I made in 4.1 (increase the size of mdev in the cmap stucture, increase NMOUNT and NSWAPX in param.h, fix mount/umount) but it doesn't seem to work. I even talked to Mike Karrels in Dallas and he indicated that that was all I had to do. The problem we are experiencing is that random processes dump core at random times. This can be very annoying if the shell core dumps, and it can be disastrous if "init" core dumps. The behaviour seems to indicate some kind of swapping error. At first I didn't even associate this problem with the changes to the coremap structure but in a final act of desperation I backed off the change and now the system runs fine. We have been trying to track what we thought was a weird swapping error for three months (tues and wed eve.) and have now been running smoothly WITHOUT the coremap changes for over two weeks. We now feel that all our other changes are done and the system is ready to release to the users. The only problem is that one of our machines currently has eighteen mounted file systems and another one has twenty-three! To compound the problem, we are also expecting delivery of six new disk drives (400M Eagles). Before anyone says "Why dont you just make a few bigger file systems?", there are internal political reasons why we need to portion out the disk space in relatively small (30 - 60 Meg) chunks. Sorry for rambling on so much but if anyone has ever gotten more than 15 file systems to work, PLEASE let me know how you did it. -- Dave Brierley Raytheon Co.; Portsmouth RI; (401)-847-8000 x4073 ...!decvax!brunix!rayssd!dhb ...!allegra!rayssd!dhb ...!linus!rayssd!dhb