Help, tbtape is trashing my rootdbs!

Have the following hardware, OS, and Informix . . . IBM RT AIX 2.2.1 Informix OnLine v4.00.UD4 Here's the problem . . . After initializing rootdbs and shared memory without any difficulties I use ISQL to create a couple of databases, fill one of them up with records and the other is simply empty. Now I wish to back-up this entire configuration to tape. So I use the Archive option from within tbmonitor. I then choose the option to Create, mount the tape in the drive, select "0" for a level 0 archive and then receive the following error message: Error reading from the disk, Error No. = 5. If I don't shutdown OnLine, I can still access the databases but if I do shutdown OnLine, I get the following error messages when I attempt to bring it back up: Bad Primary Chunk '/dev/rootdbs' tbinit: fatal error in shared memory initialization I'm fairly certain there's nothing wrong with the tape perameters I'm using because, oddly enough, if I only create the first database, I can back-up the system without it corrupting the rootdbs. It's only after I add the second database and attempt to back it up that it trashes rootdbs. If I make no attempts to back-up the OnLine partitions, OnLine goes up and down just fine. Now when I went to school, I was always of the impression that back-up utilties are for the preservation of your data. Maybe I'm missing something but this tbtape program just doesn't seem to be fitting the mold here too well. Has anyone run into this before? Know a fix? Could this be related to improper setting for shared memory and semaphores? If related to shared memory etc., could someone please email me either their /etc/master file or the relavent stanzas from it? Thanks. -- +--------------------+-------------------------------------------------------+ | Michael Faurot | Domain: mfaurot@bogart.UUCP | | ------- ------ | UUCP: ...uunet!media!ka3ovk!irscscm!bogart!mfaurot | +--------------------+-------------------------------------------------------+