I'm looking for recommendations on a Network Attached Storage (NAS) device. We had an Iomega device for several years, but it started to fail and now won't even power on. While it ran, it performed well. I tried replacing it with something labeled "Purex" on the box, but there were no manufacturer markings on the device itself or on any documentation or CD. I think this was just a generic Chinese NAS that vendor could relabel. It performed horribly. It would disconnect from the LAN -- apparently under load, was slower than an attached USB drive, would fail to copy large files and more often than not fail to open large PDF files and other document. It was a disaster when the users tried it use it today.
So, what would you recommend? I'd like to have 4 drive bays and I'd like to re-use the 4 2TB drives I have as they are fine and one or two are new. I'd like at least RAID 5 capability, gigabit network connection. The iomega device would automatically send and email if there was a problem, which is nice but I can live without that. I have large backup files of 170GB, so the file system needs to hand that.