Can't start third O7 instance

Hello all -
I'm having trouble starting up a third oracle 7.1.3.2 instance on my hp755. I get the following message when trying to start it:

SQLDBA> startup
ORA-07279: spcre: semget error, unable to get first semaphore set. HP-UX Error: 28: No space left on device Additional information: 1
SQLDBA> However, I am able to start an Oracle 6.0.36 instance when the first two O7 instances are up. (The O6 instance is not up when I try to start the third O7 instance.)

The machine should have plenty of semaphores (semmni=188,semmns=400, shmseg=120,shmmax=67108864,shmmni=320) and has 448mb RAM.

Any help would be great - Thanks

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