i am not sure whats Hitachi Accelerated Flash?
Like SSDs were just a bunch of disks, and acted independently. So AFA need another device call Flash accelerator or something to enhance the performance even though after having flash drives.
The Hitachi Accelerated Flash is more functional and performing than standard SSDs. The internal datapath, CPU processing and concurrent queue capabilities make each FMD perform to about x4 that of SSD. You can see this in the SPC-1 declarations where HDS uses far fewer flash drives than other vendors with SSD and still obtains massive IOPS.
As for the "acceleration" aspect, HDS is able to put special code into the arrays operating software (SVOS) to interact with the FMDs capabilities. One feature is the ability to decide when to load data into the array main cache and when to go straight to the FMDs. This is subject to patents.
You don't need "this acceleration", you get it automatically with the array+FMD Gen-2 combination. If you want the best Low-Response performance then it is a clear advantage.
You can also choose to use standard SSDs and get normal SSD performance. This generally tends to be for small scale flash requirements or upgrades into an existing array.
Thanks Glenn your reply was really helpful.
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