[notorandit]

... and It is ok.

I bought 16TB disk because I needed that much storage.

If I were using, say, only 10TB, I would be wasting 6TB.

I can expand my LVM as much as I can. But I definitely want my disk to be full. Same goes for my RAM.

And I want my CPU ide time to stay as close as possible to 0% and my load average as close as possible to my no. of CPUs.

Anything else would mean oversizing and overspending.

[rcxdude]

Slack has value, though. Your full disk is likely to be very fragmented, making file access slow. A CPU running a full throttle cannot deal with spikes in demand. full RAM means less cache space available. And these issues get asymptotically worse as you approach 100% utilization (which can have catastrophic effects in organizations which are too heavily optimized for high utilization).

[cxr]

Somehow I get the sense that you don't shoot for a balance of $0 in your bank account.

[notorandit]

If my plans is to have it all invested (or spent), then yes it is ok.