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Feature Summary

The 220 supports most of the same features as the 440, except for those that require four drives. So refer to the 440 review for details. Here is a feature summary, however, for quick reference:

  • JBOD, RAID 0, 1 volumes with optional encryption
  • Network file sharing via SMB/CIFS, NFS
  • HTTPS admin
  • FTP (by account and Anonymous)
  • Joins NT Domain / Active Directories
  • Immediate or scheduled backup to / from attached USB drive & rsync servers
  • 5 licenses for BlackArmor Windows client backup (includes "bare metal" restore)
  • Secure remote access via web browser and Seagate Global Access service
  • User quotas with grace period
  • Email alerts
  • USB UPS shutdown synchronization
  • USB print server
  • Dynamic DNS (dyndns.com, no-ip.com)
  • UPnP AV / DLNA, iTunes media servers
  • FTP / HTTP download service (files only, not folders)

Along with these features come some weaknesses, however. Online RAID expansion and migration are not supported, there really isn't any logging and the bundled backup client is Windows only.

Performance

The NAS 220 was tested with our standard test process. I tested a pre-production model, loaded with two ST31500341AS Barracuda 7200.11 1.5 TB drives and running 2000.0312 firmware. Seagate told me that this release is identical to the 2000.0311 that is loaded in retail units, except that it has Telnet enabled for development debugging purposes. Tests were run with 1000 Mbps and 1000 Mbps with 4k jumbo LAN connections in RAID 0 and 1 modes.

Backup

I first checked backup performance to an Iomega UltraMax Pro Desktop Hard Drive configured in RAID 0 attached via both USB 2.0. The test copies a 4.35 GB ripped DVD test folder that I use in the NAS Chart Vista SP1 file copy tests from the NAS to the attached drive. I tested with the Iomega drive formatted in FAT32 by the 220's built-in USB drive formatter and formatted in NTFS by a Win XP system using the Windows Computer Management Disk Management tool.

The results are summarized in Table 1. Performance is similar between the 220 and 440 with both drive formats. But both products currently occupy the bottom two positions in the Backup to USB Drive - FAT Format NAS Chart.

Product Seagate BA NAS 220
Backup Throughput (MBytes/s)
Seagate BA NAS 440
Backup Throughput (MBytes/s)
USB - FAT32 6.2 5.0
USB - NTFS 3.0 2.0
Table 1: Attached backup throughput test summary

I also tested NAS-to-NAS backup between the 220 and a Synology DS109+. As I have shown in the How To Back Up NAS To NAS series, most NASes use rsync to perform backups to other NASes. Using the information in the Part 2 article, I set up a networked backup of the same test folder that I used for the USB backup test to a Synology DS109+. The settings I used are shown in Figure 4.

NAS to NAS backup to Synology DS109+ settings
Click to enlarge image

Figure 4: NAS to NAS backup to Synology DS109+ settings

I measured 12.57 MB/s for the backup speed of the 220 to the Synology. This is on the low end of NAS-to-NAS backup speeds that I have measured.

Don't forget to use the new backup benchmark NAS Charts if you want to compare backup speed to other products.

Benchmarks

Figure 5 shows a summary of the benchmark tests run for the 220. There's a slight performance penalty between RAID 0 and 1 for write. But RAID 1 read is actually faster than RAID 0. The other notable thing is that write cache effects are very minimal, with very flat performance over the entire range of file sizes tested.

RAID 0 performance with a 1000 Mbps LAN connection averaged over the 32 MB to 4 GB file sizes and with cached results above 125 MB/s removed from the average comes in at 22.7 MB/s for writes and 34.8 MB/s for reads. Average RAID 1 results came in at 19.6 MB/s for writes and 37.7 MB/s for reads.

Performance benchmark summary - NAS 220

Figure 5: Performance benchmark summary - NAS 220

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