nagy%bsndbg.hepnet@LBL.ARPA.UUCP (02/28/87)
> I have a question that I was hoping someone could answer for me. >It concerns the SYS0 and SYSE.SYSCOMMON directories on my system disk. >Both of these directories are identical, I tried deleteing some files from >one and they were gone from the other also.....bad mistake! I would like >some information on whats going on here, can I do away with it, what >purpose it serves, where I can find more information on it in the manuals. The SYSE root is currently reserved by Digital to hold a "copy" of Standalone Backup. Thus you can quickly boot a copy of Standalone Backup to allow you to save/restore disks (you can save the system disk using the SYSE S/A Backup, but you can not restore the system disk using it!). Certainly faster than loading S/A Backup off of floppies or TU58's. The STABACKIT.COM procedure sets up the SYSE root, but rather than making copies of the files necessary for S/A backup, it adds a synonym directory entry. You will find, if you do DIRECTORY/FULL, that the SYSCOMMON.DIR entry in [SYSE] has the same file number as V4COMMON.DIR. Now, the [V4COMMON] tree is the common system tree with the files which are common to all the system roots on a common system disk. Deleting anything from [SYSE.SYSCOMMON] is IDENTICAL to deleting from [V4COMMON...]. The [SYSE.SYSEXE] directory contains separate files needed by S/A Backup and not common with the other system roots.