After OS upgrade, can't run database engine

We're running Unixware 2.1 and Informix Online 7.23.UC1 on a Compaq Proliant 1500 server (Dual 200 MHz Pentium Pros ). We just upgraded our Unixware from version 2.1.1 to version 2.1.2. After the upgrade we cannot instantiate Online. The following message appears in the "online.log" error file: 08:27:18 shmat: [ENOMEM][12]: out of available data space, check systemMAXMEM 08:27:19 mt_shm_init: can't create resident segment I've checked the Kernel parameters related to Informix Online to make sure that they are the same on the upgraded OS version as the previous one. As far as I can tell, they are, although some of the Kernel parameters specified by Informix don't actually exist in Unixware (SHMMIN, SEMMAP, SEMMNU, NCALL, NPROC MAXUP) Also, as far as I can tell, there is NO tunable called MAXMEM. SHMMAX, though, is set properly. We then removed the 2.1.2 upgrade, going back to 2.1.1 level, rebuilt the kernel, then rebooted. But upon reboot, Online once again will not come up (w/ previous level OS), and we get the same error messages! Ugh!! The only thing that saved our butts and keeps us in business is the fact that I saved the original Unix kernel (before the upgrade) and am booting from that. Any ideas what is going on? TIA. -- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ADDRESS ALTERED TO FOIL SPAMMERS: Remove "*NO-SPAM*" to reply. Cosmo Lee Multi-User Computer Systems Brooklyn, NY "JUST SAY 'NO' TO SPAM" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *