fdc@materna.uucp (Frank D. Cringle) (07/13/90)
We have been caused considerable grief recently by a problem which appears to occur when two processes attempt to write to the same file simultaneously. This is not something we actually want to do, but it can happen when two mis-coordinated folk start "make" in the same directory at about the same time. Two copies of the compiler run in parallel, happily generating the same .r files etc. The effect we see is a trashed hard disk -- garbage written over a large section of the disk generally including some important directories. The multi-hour restore of about 100MB from a QIC Streamer is no fun! I would like to find out if this effect is specific to our system, and therefore probably due to some local hack, or if similar effects have been observed elsewhere. Here is the configuration: * Eltec Eurocom-5 with OS9 v2.3 * Micropolis 1375 disk * Miehle cacheing SCSI driver Any tips greatly appreciated. In the meantime I am going to hack make so it opens a non-sharable lock file before proceeding. Frank -- Frank D. Cringle | Tel. +49 231 5599 124 Dr. Materna GmbH | fdc@materna.uucp Vosskuhle 37 D-4600 Dortmund 1