Turn a Poweredge T630 into a storage array or disk array for a T320.

I recently came into possession of two poweredge servers second hand. They both work but I would like to interconnect them to make a larger storage pool. 

I have no previous experience with this stuff so help would be appreciated as well as a breakdown on terminology that may be difficult for begginers like me. 

Question-

Can I turn the poweredge T630 or another T320 into a stoarge array/disk array and connect it to the T320 to serve as a larger storage pool attached as local drives? 

I currently run the T320 with Truenas for at home storage but I would like the option to expand within one server rather than access two. Storage is for basic personal business and small company data storage. Nothing absurd.  

Thanks in advance to all who may help or try to help.