How do I increase the number of shared memory segments To increase the number of shared memory segments, change the tunable SHMMNI by using the idtune command. # /etc/conf/bin/idtune SHMMNI 300 Then rebuild the kernel and reboot the system with the new kernel. For more information see idtune(1), "How do I rebuild the kernel" FAQ, config(1) or /etc/conf/mtune.d/ipc.