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> It appears that the "noop" scheduler merges requests, so you are likely
> getting between 3 and 4 I/O command merges per command to go from 4800
> to 17800 IOPS.  I'll have to check on this to see if that changes anything on this
> end, since I thought that the default scheduler also performed command
> merging.

It appears that "deadline" is the only scheduler available in later kernel versions (at least in Ubuntu).

Damian - do you recall what the scheduler was set to prior to changing it to the noop scheduler?

Eric