mrsas scatter/gather tunable?

I have a couple of RAID arrays attached to an old(-ish) LSI 9285CV-8e 
controller and, while doing a backup between them, I seem to be running 
into a driver/controller resource issue :-(

Every 5 minutes when a 'health check' runs, it logs a shower of "mrsas0: 
Cannot allocate ioctl data mem" messages. This seems to be as a result 
of running into the 16 s/g buffer limit for pass-through IOCTLs used by 
smartd and/or storcli.

There doesn't appear to be any data corruption, just annoying log lines.

Has anyone else run into this?

	Michael