Celerra NX4 Software Upgrade Noob Question

Hi Guys,

I am considering upgrading DART on our Celerra NX4 for two reasons, to stay current and also to try and get some better performance. We are currently running 6.0.40.5 which is what it came with, we would go to the latest stable which appears to be 6.0.60.2. I have never done one of these upgrades and am seeking advice from more experienced people.

I am planning on running the upgrade using the Unisphere Service Manager upgrade tool. The tool appears to have all the bases covered, I have run the pre upgrade health check and that came up clean. I am quite nervous about running the upgrade as if the NX4 dies during the process I will be in deep trouble. I guess what I am asking is, how reliable are these upgrades (anyone have horror stories) and is there anything I should be looking out for before proceeding, anything I can do to lessen the risk and make things go smoother? Obviously I have backups but what are the chances of the upgrade breaking everything and losing all the data? Is there a way to backup the celerra config to help resurrect it if it dies. Also if anyone has any experience with those specific versions and could give any advice on whether it is worth proceeding with the upgrade, I can see value in "if it aint broke don't fix it" and I won't proceed if there is nothing to gain.

Thanks for your time.