No memory to allocate APD (All Paths Down) event subsystem.
This event is from a subset that specifically concerns SCSI device issues.
There is an issue with the configuration or availability of this attached SCSI device.
See the event description for more detailed information specific to this event. Review the VMware online document vSphere Troubleshooting Guide for more assistance.
Refer to the VMware Online Documentation for more information on vCenter event messages and possible solutions.