Performance - Benchmark Comparison
The 321 was put through our standard NAS Chart tests in JBOD and RAID 1 modes with 100 Mbps, 1000 Mbps and 1000 Mbps w/ 4k jumbo frame LAN connections. To ensure connection at the intended speeds, the iozone test machine and the 321 were manually moved between a NETGEAR GS108 10/100/1000Mbps switch for gigabit-speed testing and a 10/100 switch for 100 Mbps testing.
- Firmware version tested was 1.00
- Drives used were two Hitachi Deskstar HDS721680PLA380 80GB 7200RPM 3.0 Gb/s SATA hard drives with 8MB of cache supplied by D-Link
- Keep in mind that the maximum raw data rate for 100Mbps Ethernet is 12500 Kbytes/sec and 125000 Kbytes/sec for gigabit
I first used the Compare Benchmark chart feature to plot throughput vs. file size for the various benchmark tests. Figure 12 shows a comparison of 100 Mbps benchmarks for the "large" filesizes from 32 MB to 1 GB. There is no sign of write caching, which is indicated by speeds in excess of the maximum LAN speed (12.5 MB/s for 100 Mbps Ethernet). The read plots are also unusual, with a noticeable rise in speed as file sizes increase.
Figure 12: 100 Mbps Write and Read benchmark comparison
Figures 13 and 14 show the 1000 Mbps Write and Read results respectively. At least for write, it looks like jumbo frames really do boost performance.
Figure 13: 1000 Mbps Write benchmark comparison
It also looks like RAID 1 significantly knocks down write speed. But all read modes seem to have about the same speed profile.