FYI, Western Digital’s blue line is targeted towards performance drives in a desktop environment. They are not intended for RAID applications or for server applications, were reliability is more important than performance. The WD red line targets the RAID and reliability requirements.
Thank you, iwalker!
It does seem like I forgot some things. Thanks again, there is something new I learned today. 
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I would (as others have posted) NOT use a swap file on the raid, on ANY SSD. zramctl is your friend. You can set up a swap in memory (I know, I know, “why would you do that?!?”, but google it and you’ll understand as I did. 
) and reap the benefits. Check out these articles:
Thanks for the information on zram, I wasn’t aware of it, as a suspect a lot of small operators are not. I really don’t think any swap is needed given the normal activity on this server but I will replace what is there as soon as possible. Re comments about WD Blue not being suitable for RAID, I have replaced two fo the 4 SSD’s with WD Red now as part of this recovery as their marketing specifically says designed for NAS usage.
Finally, re heat, I am using a commercial 2U rack box with 4 fans. It was designed for 4 HDD’s and I put adapters for 2 SSD’s in two of the bays so I would expect enough cooling but I’ll spread them out a bit. Thanks folks.
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