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Pros: This unit has a great price for what you get. It's a good way to get a basic RAID with some monitoring and email alerting.
Cons: after using this for just over 12 months, the RAID started reporting failed clusters on the drives -- always 2 drives at once, which made me doubt the drives were actually at fault. The errors were sometimes accompanied by a bluescreen/reboot. I at first thought it was the enclosure at fault; I connected single drive enclosures to get by while I fixed this, then those started to disconnect randomly. I replaced the RR622 card with a RR640L, everything's working fine now.
Other Thoughts: There is a lot of forum chatter out there about having to have the right drives, and if you don't then that's why your drives are dropping out of the array.
FWIW I have been running WD Red 2TB model WD20EFRX. They are not on the Sans Digital "approved" list but they work well. For that list, take a look at San's Digital's product information webpage.
Some SMART features are missing, and you can't do staggered spin-up, but these meet my needs pretty well.
This review is from: Plextor PX-NAS2-BL1 Diskless System Network Storage
Pros: this unit has a very nice interface, easy to understand and navigate. The advertized features are great, though I haven't gotten around to checking them all out, as I'll explain under "cons"
Cons: "slow" is indeed the best descriptor for this Plextor. To view current storage status takes 15 - 20 seconds; accessing other menu items 5 - 10 seconds; to add a new user or group not too bad at 2 - 3 seconds. It doesn't seem so bad at first, but going through and setting up a lot of options starts to seem like forever. I started to feel like I was spending my whole life watching the little dot-circle spin around. So, I had been wanting to take a look at the built-in torrent client, but waiting on the interface took so long, I just had to go to sleep. Anyway if browsing in that section is like the rest, then it might not even be usable. Or maybe you just have to input a URL anyway.
I connected an external Nexstar 2.5" drive, it looks like it will take a total of 60 hours to transfer 400 GB. I would have copied over the network, but I wasn't able to map a drive -- that could just be my own failure. However, once the transfer started certain interface elements got much, much slow
Other Thoughts: This thing reminds me of Windows 3.11 on a 286 -- especially if you dared to open a web browser. Maybe the modern equivalent would be Vista on a Pentium II. I actually started to wonder if it was some 386 level CPU running it -- more likely an older, slower Atom processor or something.READ FULL REVIEW