KDUMP SETUP

Hi everybody
I have a RHEL 7.0 server in the environment, randomly the server becomes slowly,.
The server acts as a DB server fro Cache DB and runs a lot of cups processes, The server boots from a 8GB SD card, no internal HDD's .
The rest is all connected to a LUN on the 3PAR. My question now is, How do I configure KDUMP to dump to the LUN on the 3PAR, as it looses connection to the 3PAR as soon as it becomes slowly.
Should we invest in a few internal HDD's to resolve this issue.
Thanks
Jurgens