Permission Issues: ReadyNAS RR4312X goes total read only mode, inoperable

So I have been having trouble communicating with L3 Support staff, so I might just ask my question here.

So we paid for the premium support with the hope of resolving this issue, and it came back basically like this:

- File System is in a very bad shape: 
Data, single: total=30.85TiB, used=28.25TiB 
System, DUP: total=8.00MiB, used=3.34MiB 
Metadata, DUP: total=27.00GiB, used=24.21GiB 
GlobalReserve, single: total=512.00MiB, used=201.25MiB

After a little back and forth, the L3 staff followed up with:

- Poor setup: the customer ended up with almost 30 GB of metadata that are quite enough to cause troubles.

I have not had any luck getting the L3 staff to explain further what all these means.  All I have access to (as the customer) is the GUI, and in the GUI there is no information about any of those things.  How am I supposed to monitor or do anything about those???

I guess I could probably enable SSH service and check there.  However when I try to enable SSH it says "For security reasons, we recommend that you do not enable SSH. If you enable SSH root access, NETGEAR reserves the right to deny you technical support."  So it appears we're not supposed to do that.

I'm very concerned because we have two of these NAS, and I'm afraid the other one will be down soon as well.  Could you help me understand this issue?

Another thing is the L3 Staff mentioned that the hard drives used in the NAS is not in the HCL.  I swear the hard drives were in the list last year when we bought it, otherwise we wouldn't spend the $$$$$ to buy two of these.  Do hard drives gets pulled out of HCL ever?

Thanks for your help.