Did you ever get anywhere with the type D CP's "caused by low datavecs"? I have a 3240 HA/Pair with next to no load on it (one vfiler with several VDI's) and when our vmware admins were vmotioning some machines from the 3170 to the 3240 we saw the following:
(Hardware is 3240 running 8.0.2P4) with Flash Cache Modules and 65 disk aggr of 600Gb SAS).... just not finding much online explaining what the TYPE D really means.
CPU NFS CIFS HTTP Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP CP Disk OTHER FCP iSCSI FCP kB/s iSCSI kB/s
in out read write read write age hit time ty util in out in out