HD to SSD question.

[Heinz Diehl]

On 19.08.2013, Mihai T. Lazarescu wrote: 

> It appears that CFQ can sense and adapt to SSD and has little
> if any loss to other I/O schedulers:

> http://www.velobit.com/storage-performance-blog/bid/126135/Effects-Of-Linux-IO-Scheduler-On-SSD-Performance

They only tested bandwidth, not latency. On my systems, deadline
outperforms cfq, both wrt bandwidth *and* latency, both felt and
measured. Latency is especially sensible when there's a lot of disk 
I/O. You can do some testing using Ted Tso's fsync-tester:

https://oss.oracle.com/~mason/fsync-tester.c