HP-UX Error: 12: Not enough space

Hi All,
I am running Oracle7 Server Release 7.3.4.5.0 on Hp-Ux box
When i start up the database ,I am getting this error can any one help me how to sort this problem
SVRMGR> startup
'ORA-07306: sms1sg: shmget error, unable to get a shared memory segment.
HP-UX Error: 12: Not enough space
Additional information: 1
SVRMGR>

check ur resources as the message is very clear.