Summary: We are very pleased with the quality and performance of this solution, especially considering the price! We paired this QNAP with 8 3TB drives.. 7 drives in raid 5 with 1 hot spare which gives us over 16TB of usable space!
Summary: I made the unfortunate mistake of buying 4 of these for a small datacenter at work. Within a few months, all but one of them has died in some spectacular total-data-loss manner. The first crash was an iSCSI firmware/driver issue. I had about 10TB of data on it, and it was unrecoverable. QNAP support's suggestion was to restore it to factory default and restore my data from a backup - which is a little bit inconvenient in the middle of a workday.
Summary: I purchased this and coupled it with eight 3TB sata drives to get some low cost storage for backups. The quality of the unit seems to be good. Setup took about an hour and was easy. It automatically updated firmware the first time I booted it. I have the entire space setup as a single volume and have a single LUN presented via iSCSI to Windows 2008 R2. The biggest thing I was concerned with was throughput.
Redundancy Incomplete / VMWARE Incomplete / Poor Support
D. W. Corcoran "b393capt", Amazon
26 November 2013
Summary: I find the product lacking in its redundancy feature set and customer support. This comes from first hand experience during the failure of a drive in the QNAP TS-879U-RP, 8 drive product, in January 2013. I am writing to update this review in May 2013. The issues are not solved. In addition, what I had believed to be a VMWARE VMOTION issue, VMWARE has been able to reproduce and has communicated the problem is with QNAP firmware issue that isn't solved.
Summary: I bought this as cheap iSCSI storage for backups. It works well in that role, the price is right. I bought the 10GbE adapter with it but for the first year I didn't have anything that supported 10GbE to connect it to. I finally got a server with a 10GbE adapter and just hooked it up today and although it shows a connection at 10Gbps the performance is not much difference than over GbE which is disappointing.
Summary: This NAS is very productive and reliable! But it seems like some functions which were available on other models like Download Station are not supported on this device. May be it will be solved with the next firmware update.