This error does *not* mean that you have run out of disk space. It occurs either if all available shared memory IDs have been taken, in which case you need to raise the SHMMNI parameter in your kernel, or because the system's overall limit for shared memory has been reached.The PostgreSQL documentation contains more information about shared memory configuration.
[Description]
Supplementary information was output.
[System Processing]
[Action]
Refer to this message together with the message that was output immediately beforehand.