Unfortunately, our today’s tests do not provide a clear answer to the question if building a RAID0 out of modern SSDs makes sense. This solution has its highs and lows and we can only do as much as lost them all and let you be the decision maker.
RAID0 is a traditional method of boosting your disk subsystem performance. The trick works with SSDs, too. Combining two SSDs into a RAID0 helps increase linear read/write speeds as well as the speed of processing small data blocks at a long request queue. We did notch very impressive sequential read and write speeds in our tests, getting much higher than the SATA 6 Gbit/s bandwidth.
However, we should keep it in mind that modern SSDs have a tendency to get faster as their capacity grows even within the same product series, so a two-disk RAID0 may turn out to be slower than a single large-capacity SSD. More importantly, SATA RAID controllers, including those in modern chipsets, do not support the TRIM command. As a result, the array’s writing performance degrades over time whereas single SSDs are less susceptible to this problem.
Thus, a RAID0 will only be superior to a single SSD at linear operations whereas random-address operations will expose its weakness. That’s why we can’t prefer the RAID0 solution to a single SSD without reservations. On the other hand, most of our lifelike benchmarks do show the RAID0 to be overall faster. In other words, the RAID0 is better on average, especially as it doesn’t involve any investment: the cost per gigabyte is the same for a RAID0 and an SSD of the same capacity.
There is some inconvenience about running an SSD RAID0 that should also be mentioned. You cannot monitor the health of your SSDs in a RAID0 or update their firmware. A RAID0 will also have lower reliability since a failure of any SSD causes the loss of all data stored on all the SSDs in the array.