The AIX Error Log facility is configured by default to be 1 MB in size. When the log fills up, it wraps around and overwrites existing entries. The SP software is utilizing the AIX Error Log frequently. Therefore, you should set the size to at least 4 MB. You can do this once for all nodes with the dsh command after the nodes are installed.
dsh -a /usr/lib/errdemon -s 4096000