500 Servlet Exception

java.io.IOException: No space left on device
	at java.io.FileOutputStream.writeBytes(Native Method)
	at java.io.FileOutputStream.write(FileOutputStream.java:260)
	at com.caucho.vfs.VfsStream.write(VfsStream.java:216)
	at com.caucho.vfs.WriteStream.write(WriteStream.java:299)
	at com.caucho.server.http.ResponseStream.writeCh