A good read by Dave Cartwright on The Register
Here’s a snippet:
If you’re buying flash storage today, you’re doing it for speed. After all, you’re not doing it to save money and you’re definitely not rich enough to be doing it because you want to be green and save a few kilowatt-hours on your power bill.
With spinning disk, the disks themselves were probably the bottleneck in your SAN-based storage arrays. With flash, though, the drives are so fast that the storage infrastructure itself becomes the weakest link: that is, it’s slower than both the storage and the servers.
Hence there’s a growing temptation to move at least part of the storage into the physical servers to put it close to the applications; it’s then either a cache (in front of the shared storage to which data is written later) or a full first-tier storage medium (with the shared storage as second-tier storage)…
But what are the upsides and downsides to that?
Read the rest here:
https://www.theregister.co.uk/2014/09/25/flash_storage_server_integration/