Le 28/01/2019 à 15:03, Saurabh Nanda a écrit :
An update. It seems (to my untrained eye) that something is wrong with
the second SSD in the RAID configuration. Here's my question on
serverfault related to what I saw with iostat -
https://serverfault.com/questions/951096/difference-in-utilisation-reported-by-iostat-for-two-identical-disks-in-raid1
I've disabled RAID and rebooted the server to run the benchmarks with
client=1,4,8,12 with shared_buffers=8MB (default) vs
shared_buffers=2GB (optimised?) and will report back.
You should probably include the detailed hardware you are working on -
especially for the SSD, the model can have a big impact, as well as its
wear.
Nicolas
