Synology SA3400 Virtual Machine Manager s White Paper - Page 28

Benefits of SSD Cache on Storage Node The data provided below show a significant, but limited effect of SSD cache on data throughput volume, whether write or read. However, a large improvement can be seen in processing speed for small random IOPS, and adding SSD cache gives an outsize boost to random write performance, as long as there is enough space left for the write buffer. (At high data volumes or large packages sizes, performance might not benefit as much.) Storage performance (64KB block sequential throughput in MB per second) DS918+ HDD HDD + SSD Cache Read 381.23 399.86 (+4.9%) Write 216.19 220.8 (+2.1%) Comparing Configurations Storage performance (4KB block data random IOPS) DS918+ HDD HDD + SSD Cache Read 739.46 973.73 (+32%) Write 412.92 11307.89 (+2645%) 26