Performance - Write / Read
Figure 20 presents a summary of the benchmark tests run for the DS209+II and Figure 21 shows the DS209. Write cache boost is very pronounced for both products up to 256 MB file size and then drops to more realistic speeds, ending up around 50 MB/s at the largest file sizes measured for both RAID 0 and 1 volumes. Read speeds cruise along in the 60 MB/s range across file sizes from 32 MB to 4 GB, again, for both RAID 0 and 1.
Figure 20: Performance benchmark summary - DS209+II
RAID 1 write 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 measured 64.1 MB/s for the 209+II and 59.2 MB/s for the 209. Read averages were 62.5 MB/s for the 209+II and 63.6 MB/s for the 209.
Figure 21: Performance benchmark summary - DS209
So, at least for the iozone-based tests, the two products seem about equal in performance.