QNAP TS-659 Pro II Review
by Ganesh T S on September 19, 2011 8:00 AM EST- Posted in
- IT Computing
- NAS
- QNAP
One of the NAS aspects that does't get much attention in online reviews is data recovery. We have been trying to address that starting with our review of the LG NAS N2A2. In this section, we will first see how RAID rebuild works.
In order to test RAID recovery, we created a iSCSI LUN and filled it up with data so that the NAS became 96 % full. We removed the drive in the second bay, and the administration web interface immediately reports entry into the degraded mode. In the degraded mode, the read and write performance have negligible penalty, and the data access suffers no issues even with the rebuild going on in the background.
The removed hard drive was formatted to NTFS in Windows and reinserted into the drive bay. The rebuild went without any issues. However, repeating this with the drive in the first bay didn't go well. The following two screenshots from the system logs show the encountered issue.
This problem has also been reported on the QNAP forums here. The only way to get past this was to either insert a raw drive into the system or make sure all the partitions were completely removed from the drive to be reinserted (no NTFS or exFAT partitions). We rebuilt the RAID-5 volume three times under different conditions. The table below indicates the time taken for the rebuild process to complete with different replacement drives.
| RAID-5 Rebuild Durations | |
| 1 TB Samsung 7200rpm Drive, NAS 96% Full | 04:03:15 |
| 2 TB Seagate 5900rpm Drive, NAS Empty | 04:10:20 |
| 1 TB Samsung 7200rpm Drive, NAS Empty | 04:01:34 |
| . | |
It is evident that the rebuild takes around 4 hours irrespective of the drive being used for the rebuild.
The next aspect we tested was the one touch copy feature of the TS-659 Pro II. We used a OCZ Enyo USB 3.0 SSD filled with 100 GB of data (multiple copies of the 10.7 GB Blu-ray folder structure used in the robocopy tests) and used the one touch copy feature to copy it into the RAID-5 volume. The transfer was carried out at 87.28 MBps.The USB 3.0 feature is a nice addition to the unit, but it only makes sense in situations where you have data on SSDs to back up. We can't imagine too many people using HDDs with USB 3.0 (where eSATA is available for cheaper). We would also have liked a one-touch copy feature for one of the eSATA ports.
The table below records the power consumption of the unit under various conditions with the 6 x 1 TB drives attached. The PSU is not terribly efficient, consuming more than 1W even when the unit is fully powered off.
| TS-659 Pro II Power Consumption | |
| Powered off | 1.3 W |
| Idle (Sleep after no hard disk access for 30 min.) | 30.2 W |
| Powered on | 61.5 W |
| Powered on (Full load) | 72.3 W |
| . | |
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Sivar - Tuesday, September 20, 2011 - link
This is always a good point to bring up. The mantra on StorageReview.com has long been, "RAID is for uptime. Backups are for disaster recovery."Visual - Monday, September 19, 2011 - link
How quiet is this thing?The only reason I would go for something like this is if it is really quieter than any file server I can build myself. It will need to be literally inaudible running 24/7 in my living room or else it will annoy me to hell some night when I decide to sleep on the sofa.
And what are the chances for mods adding torrent clients, web/db server and other gizmos to the OS without complete wipe, keeping the current admin interface for the RAID itself?
ganeshts - Monday, September 19, 2011 - link
Very quiet during periods of sporadic data access. But, putting it through the NASPT benchmarks would cause it to whirr up and create a ruckus of sorts for some time (Around 2 - 3 minutes) before going back to the quiet period again. This would would repeat every 5 minutes or so. This is what one expects when there are 3 fans in the system in such a small enclosure.Final word on noise: If you are sensitive to it, don't buy it.. I think the main target of this system is at enterprise and SMB/SOHO users who don't care about noise / keep the NAS in a server room.
bobbozzo - Tuesday, September 20, 2011 - link
At least some of their models seem to support bittorrent:http://www.qnap.com/faq_detail.asp?faq_id=547
chris1317 - Monday, September 19, 2011 - link
Thanks for the review. I have been using a QNAP 509 Pro for a few years now and it is a great performer. I have been looking for an upgrade though.It would be good if you could get a hold of the newly released models TS-879 or TS-1079. They support 10 GbE which I am really interested in.
Also its worth pointing out about the limitations of raid5 with regard to the unrecoverable read error during rebuild that can present itself and result in a loss of data http://www.zdnet.com/blog/storage/why-raid-5-stops... which is why I want to go for a larger model. Allthough these models support raid 6 its tough to sacrafice 2 drives out 6 (5 in my case) for parity.
DanNeely - Monday, September 19, 2011 - link
With the $1k price premium (859 vs 879), several hundred dollars/computer for 10GB cards, and >$10k price for a 10GB router; I'm not sure if 10GB hardware really qualifies for the small office yet.chris1317 - Monday, September 19, 2011 - link
lol, its for my house :) I like my gadgets, I do worry about the URE problem though.DanNeely - Monday, September 19, 2011 - link
URE?chris1317 - Monday, September 19, 2011 - link
URE (unrecoverable read error) from the article that I linked to in my first post. With drive size increasing there is going to become increasingly likely that when a drive fails and a rebuild is in progress that a seccond drive will experience an unrecoverable read error bricking the raid. The article points out that a 7 drive RAID 5 with 1 TB disks has a 50% chance of a rebuild failure due to ure with a standard 10-14 manufacturer spec for failure. Higher spec drives are available and Raid 6 helps with this as it has a 2 drive redundancy.Spazweasel - Monday, September 19, 2011 - link
Very true about reconstruction issues. RAID rebuilding hammers a drive like little else can.Fortunately, the reviewed NAS supports RAID6, as well as RAID5 + hot spare and RAID6 + hot spare.