QNap TS-859U-RP Turbo NAS review

Small to medium businesses (SMBs) may be spoilt for choice with NAS appliances, but the majority of vendors have focused almost exclusively on models designed to sit on a desktop. QNap has a huge portfolio ranging from dual-drive right up to eight-bay boxes, but the latest TS-859U-RP Turbo NAS movies designed to fit into a rack cabinet.

The 2U rack chassis has eight hot-swap SATA drive bays and a pair of hot-plug power supplies. It's priced very competitively with a diskless model at LambdaTek available for £1,236 ex VAT and a 16TB version from the same retailer for around two grand.

QNap has moved away from Core 2 Duo processors over to low-power Atoms in its NAS devices and the TS-859U-RP is no exception with its dual-core 1.6GHz Atom D510. This is paired with 1GB of DDR2 memory, while the Linux kernel resides on a 512MB disk on module.

Businesses looking for a reliable NAS appliance need more hardware redundancy features than just dual power supplies though. Fortunately, RAID options are particularly good as there's support for all key array types including RAID-6. Using RAID 6 does mean less useable storage space, but it can handle simultaneous failures of two drives. This is especially useful when a single drive has failed and the appliance is in the process of rebuilding the array on a new drive. If another drive failure occurs during this phase you’re safe, but if it had been a RAID-5 array you’d be in deep trouble.

One area where QNap comes up short is storage expansion as you can’t daisy-chain more QNap appliances off the back of the main unit. However, it does have a pair of eSATA ports so you can add more standard external drives if needed.

The appliance has another expansion trick up its sleeve in the shape of the virtual disk feature. You create iSCSI targets on another QNap appliance, or other IP SAN storage servers, and effectively hand them over to the main unit which can support a maximum of eight targets.

We tested this using a QNap TS-439 Pro appliance with a 500GB target. From the TS-859’s web interface, we entered the IP address of this unit and it discovered the target ready for action. Once formatted, the virtual disk could be used as a location for creating new network shared folders with access managed entirely from the master appliance.

For general testing we fitted four 1TB WD GreenPower drives and used the appliance’s LCD control panel to build a RAID-6 array. This took over seven hours to complete and during this time we were unable to use the volume.

QNap’s Finder utility locates the appliance on the network and gives quick access to its AJAX-based web interface, which is very well designed. The management interface provides a side menu listing all features and selecting one provides all its details in the main window to the right of the menu.

It’s easy to create network shares and decide whether Windows, Linux, Unix and Mac clients can use them. Access controls extend to the appliance’s local user and group database or you can tie in with AD domain authentication.

For performance testing we used a Broadberry rack server with dual 2.8GHz Xeon X5560 processors, 6GB of DDR3 memory and running Windows Server 2008 R2. Drag and drop copies of a 2.52GB video clip returned average read and write speeds over Gigabit Ethernet of 80MB/s and 75MB/s. FTP operations were slightly faster with the FileZilla utility reporting speeds of 92MB/s and 83MB/s respectively.