Re:Why Is Storage on Kubernetes So Hard?
by justinclift on Sunday January 13, 2019 @10:30PM
(#18900419)
For reference, the SCST project was the software used (back-in-the-day) for high performance block storage over infiniband:
Looks like it's still an active project too, as there's a new release listed from November 2018.
Only if your (storage) network is slow (eg 1/10/25 GbE).
With a decent network (eg modern infiniband, 40+GbE, etc) for the storage, the latency and throughput to the storage shouldn't make a difference.
For example (years ago), I used to set up SSD arrays - SATA at the time, as M.2 wasn't a thing - and have them served over a 20Gbs Infiniband network to hosts in the same data centre.
The access times from an OS perspective to hit that storage over the network were the same as for hitting local disk. But the networked storage was higher bandwidth (multiple SSD's, instead of a single per host).
Worked really well. :)