Using SSDs or other types of flash memory to accelerate rotating disk storage has become a widely used technique.
Apple introduced its Fusion Drive technology on Macs almost five years ago, and at the other extreme enterprise storage vendors such as Dell EMC, Hitachi Vantara and Oracle provide the option of boosting hard disk performance through the addition of some flash storage.
In the NAS market, Qnap claims its approach to SSD caching has two particular advantages over those taken by competing vendors.
Secondly, it allows on-the-fly reconfiguration – caching can be enabled or disabled without interrupting services, and this also applies to hot-plugging a replacement SSD whether it is being used for read-only or read/write caching. Benefits include improved availability as well as greater productivity for IT personnel.
SSD caching can deliver up to 10 times more IOPS while reducing latency by a third, according to Qnap.