转：国外较为全面的评测 smallnetbuilder

这里有很多评测，写得不错，关键还有测试数据、对比图表。

http://www.smallnetbuilder.com/content/blogcategory/50/75/

1# deed

New To The Charts: QNAP TS-239 Pro

Tim Higgins

August 20, 2009

The 239 Pro is basically a two-drive version of QNAP's TS-439 Pro. Two 2.5" or 3.5" SATA hot-swappable drives (the drive trays have mounting holes for both) in capacities up to 2 TB are configurable in separate, JBOD, RAID 0 and RAID 1 volumes and RAID expansion and migration are supported. Internal volumes can be formatted in EXT3 or EXT4. The 239 Pro runs QNAP's new AJAX-based interface, which made administration a more pleasant task. Hardware-wise, the 239 Pro has more in common with the four-drive QNAP TS-439 Pro, than the 219P. The latter is based on a Marvell Kirkwood 88F6281 @ 1.2 GHz processor and 512 MB of soldered-on-board DDRII RAM. The 239 Pro uses an Intel Atom N270 @ 1.6GHz and has a 1 GB SODIMM of DDR2 667 RAM. The OS resides in a 128 MB IDE DOM (Disk on Memory). Other details visible in the photo below are two Intel 82574L Gigabit Ethernet Controllers and an ITE IT8718F "Super I/O". The 10/100/1000 Ethernet ports support up to 9K jumbo frames and can be configured in separate, failover and aggregation modes. The generous use of heatsinks prevents identification of other key components, but given the Intel architecture, two of them are North and South bridges. Rear panel connectors include two 10/100/1000 Ethernet ports, two eSATA connectors and three USB 2.0 ports for drive expansion and attached backup. The USB ports also support UPS shutdown sync and printer sharing. There is also a 15 pin video connector, for console display. Root access via direct-attached console, SSH and Telnet is supported. Power consumption measured 32 W with two Samsung HD103UJ 1 TB 3.5" drives provided by QNAP and 20 W with the drives spun down via the programmable idle time (between 5 and 60 minutes of inactivity). Shutdown, startup and restart can also be scheduled daily, weekly on the weekend or on specific days. Fan and drive noise are medium low, meaning the NAS is noticeable in a quiet room. The main noise sources are the drives themselves (including drive clicks and thunks) and some occasional cabinet rattle. CIFS/SMB, AFP and NFS network file systems are supported, and files can also be accessed via FTP and secure (SSL/TLS) FTP. HTTPS is supported for admin access. Up to eight iSCSI targets can be configured and the NAS also can act as an iSCSI initiator. Media features include iTunes and UPnP AV / DLNA (Twonkymedia) servers and there is a download service for HTTP, FTP and BitTorrent files. The full set of QNAP features are supported including photo web serving, surveillance camera recording and LAMP webserving. Immediate and scheduled backup can be done to an attached USB or eSATA drive or via rsync to networked rsync targets. External drives can be formatted for read and write in FAT32, NTFS, EXT3 and EXT4. Fastest backup of our ~ 4 GB standard filecopy test folder measured 58.74 MB/s using a EXT3 formatted eSATA drive. NAS-to-NAS backup of the test folder via rsync to a Synology DS109+ measured 27.39 MB/s. RAID 1 write performance with a Gigabit LAN connection averaged 55.2 MB/s for file sizes between 32 MB and 4 GB, with cached behavior not included in the average calculation. Read performance was slightly higher, measuring 58.7 MB/s with the same conditions, establishing a new Chart high for two-bay NASes. File copy performance using a Vista SP1 client under the same conditions (RAID 1, Gigabit LAN) also established new chart highs for dual-drive NASes at 56.2 MB/s for write and 52.0 MB/s for read. File copy to a 10 GB portion of a RAID 1 volume configured as an iSCSI target measured 65.6 MB/s for write and 67.4 MB/s for read. QNAP NAS features have been well-explored in other QNAP reviews, so a full review isn't planned. Don't forget to compare performance (including backup) using the NAS Charts.

Thecus N5500 Reviewed

Performance - File CopyVista SP1 filecopy results (Figure 10) for RAID 5 write show the N5500 in third place, behind the N7700 with 79.7 MB/s average write speed.

Figure 10: Vista SP1 File Copy - RAID 5 writeThings are more competitive for RAID 5 read, however, since the 5500's 80.5 MB/s (Figure 11), rates only 7th place. But the N5500 beat the N7700 this time.

Figure 11: Vista SP1 File Copy - RAID 5 readFor the competitive comparison, I chose two five-drive NASes, the QNAP TS-509 Pro and Synology DS508, plus the Thecus N5200 Pro for previous-generation comparison.
Figure 12 shows the QNAP TS-509 Pro most evenly matched to the 5500, which is probably not that surprising given that the QNAP uses an Intel Celeron M @ 1.6 GHz vs. the 5500's 1.86 GHz Celeron M (and both have 1 GB of RAM).

Figure 12: Competitive write comparison - RAID 5, 1000 Mbps LANFigure 13 compares the RAID 5 read performance, which has more of a spread. The QNAP comes out on top this time, followed by the 5500. But the 5500's speed falls off with larger file sizes, touching the Synology DS508 curve at the 2 GB file size.

Figure 13: Competitive read comparison - RAID 5, 1000 Mbps LANUse the NAS Charts to further explore performance.
iSCSI & USBI ran a quick check of the 5500's performance as an attached USB drive and as an iSCSI target. I allocated around 7 GB of space on a RAID 10 array for USB, then for iSCSI. Each time, the volume was quick formatted in NTFS and tested using the standard Vista SP1 filecopy test that copies a 4.35 GB ripped DVD test folder.
USB performance was disappointing, averaging only 11.75 MB/s for write and 13.6 MB/s for read.
iSCSI target performance was much better, averaging 80.9 MB/s for write and 82 MB/s for read.
Closing ThoughtsI think that the 5500 will probably end the N5200 Pro's long reign as Thecus' go-to entry-level "Enterprise" NAS. But with an MSRP of $869 and only one vendor stocking it at $899, it doesn't seem that good a deal vs. the N7700, which can be picked up for as low as $849 as I write this. I think Thecus may need to tweak the pricing a bit...and I don't mean by raising the N7700!
The new GUI is definitely a step in the right direction, but there is still plenty more work to do to make it more appealing and user-friendly. Online help would definitely be a good addition. And the feature set needs completing, especially the backup features.
But if you've been a N5200 Pro fan (or even if you haven't) and looking to move up to a faster 5 bay NAS, the N5500 is worth a look, especially if you need multi-volume flexibility.