allocating swap space on solaris 9

Hi,

I have a solaris 9-sparc box, which after bouncing is giving swap space related error messages(that swap space is not enough). could it be possible that there was some command issued or setting made before bouncing, which was lost after bouncing? please let me know how i can add swap space and keep it across reboots.

Thanks

Add the swap space to vfstab

# vi /etc/vfstab
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot opt
/export/data/swapfile --swap -no -