Unixware 2.1.2/Informix Online 7.23: Online won't boot: ulimit '-s': mystery error

We're running Online 7.23 on Unixware 2.1.2 on a SuperMicro dual- 180MHz Pentuim Pro machine. We just upgraded from Unixware 2.1.1 to 2.1.2. Immediately we had a problem, Online would not boot. Double-checked all the kernel parameters in the release notes - everything fine. To make a long story short, the solution was to run `ulimit -s 8192`. This enabled Online to boot. But there are several mysteries that remain unsolved. 1) I didn't even know that the "-s" option existed. It sets stack size - (stack size of what? the shell, I guess?). 2) The "-s" option is not indicated in the ulimit man page, and there's no entry for it in the online docs. You have to go to the ksh93 man page to find info on the ulimit "-s" option. (Make it hard to find, why don't you SCO!) 3) So, the magic solution was to run `ulimit -s 8192`, then Online would boot. But what is strange about this is that the default on our system - when we run simply `ulimit -s` - is 16384 - twice 8192. Why would Online not boot with a stack limit set at 16384, but be OK with 8192? 4) Does anybody know if there is an equivalent Kernel Parameter to set, or a more permanent fix? 5) Here are the error messages which were written to the Online log file with the default 16384 stack size,which will send you on a wild goose chase looking for a shared memory problem: 15:29:21 shmat: [ENOMEM][12]: out of available data space, check systemMAXMEM 15:29:21 mt_shm_init: can't create virtual segment HTH someone in the future. Cosmo Lee -- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ADDRESS ALTERED TO FOIL SPAMMERS: Remove "*NO-SPAM*" to reply. Cosmo Lee Multi-User Computer Systems Brooklyn, NY "JUST SAY 'NO' TO SPAM" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *