Server becomes io-bound on no disk writes.

[compdoc]

In my own testing I do know that the speed/throughput is better for the WD
Black than the Barracudas I've tested.

Possible to get the  output of this on each?

alpha:

sudo hdparm -t /dev/sdc2


bravo:

sudo hdparm -t /dev/sdb2


If I have it right, those are the large partitions on disk #2 of each
server. Hopefully, they aren't busy at the time of testing...