Average Response Time

The average response time is the average amount of time a storage device takes to receive a data request, find the corresponding data, access it, and return the requested results. It depends on various factors, including network bandwidth, the number and type of data requests, the type and technical characteristics of the storage hardware, and the number of users performing these data requests. The results below assume the NAS is accessed by a single user only. Check the "Performance Summary with Multiple Clients" page for multi-client response time results.





The server's response times are generally low.

Throughput

The following graph shows the overall throughput of the NAS in all tests I conducted using the DiskSpd tool in an OLAP scenario with QD4.



Some comparison graphs follow.



The differences here are small because the full bandwidth of the Gigabit Ethernet connection is utilized with the SSDs I use, as well as the type of transfers DiskSpd performs. As you can see, transfer speeds are in some cases identical for the first two NAS servers (DS920+ and AS5304T).

IOPS

The next graph shows the recorded IOPS in all tests I conducted using the DiskSpd tool in an OLTP scenario with QD4.



The necessary comparison graphs follow.



The DS920+ strays pretty far behind the DS620slim and only manages to beat the entry-level DS420j and DS220j.