yeah, not raid. I don't do anything with the performance boost in writing and reading speeds that raid offers. Not so many clients are using the server simultaneously that raid would be worth of risk losing data. I have heard some horror stories about those poor ones who have lost all the data when the raid array has failed.
The drives are pooled, so system shows that data is on one drive. I can determine how flexraid organise data. It can fill up drives evenly or fill up one drive first and then starts to fill up another one. I can check from flexraid configuration panel what is the drive that is actually holding a particular file. However, after system failure I don't think there's an easy way to locate the data. I guess I'd just put the drives to another pc and search the data. It would be tedious, surely
There was one dude who migrated from flexraid setup to another similar. He said it was painless and easy task. So I'm not worried if I have to migrate from flexraid to another software. I hope that day won't come too soon as I'm very happy with my current setup. Server is running in a closet and works like charm. Maintaning is so easy. Current up time is 195 days. I have never had any hiccups and it's been running for years. Centralised data server is golden.