It indeed comes down to cost / benefit / risk
. I used to do this all the time. My 'older' gear became used for DR purposes, or became part of the infrastructure where I tested recoveries on a regular basis (Yes, I am one of those guys that actually did that, although not enough
). By saving your company money by reusing the older equipment and move it to DR you can make them happy but it comes with risks that you need to be aware off and explain those risks very well to your managers.
- If you fall back on your DR side, be aware you won't have a support contract on it anymore and if something happens at that moment (and yes, I was so lucky at a certain point in time
- What is the cost of resources for that older HW now (electricity / cooling / ...) and how much will it cost for newer generation HCI nodes? Might look stupid but it can make a difference (unless you leave your DR site off all the time but I assume that is not the idea of a DR site
- Study / Experience: You probably know the tools / management for the old infra very well, but what if a new IT person starts at your company? Then he / she needs to learn two types of infra (with the older one being forgotten until too late
). Having two same type of environments saves on education and probably also less management time. But is that enough to justify the cost of other nodes
And I am certain I am forgetting a few more. Maybe they come back when I have my morning coffee