Low SSD write IOPS (~100)

Solution 1:

We made the same observation at our tests with SSD in Gen7, but I guess the difference to Gen8 is not very big.

If you connect the SSD directly to the Board, the Performance is as you would expect ( the ProLiant servers have only one port for that where the DVD Drive is connected at default).

If you connect the SSD via the Raid Controller, no matter if you configure no RAID (Jbod) it slows you down, as long as the data has to go through the Controller the Performance is shitty. We guess it has to do with the controller not build for drives that fast.

If you buy HP SSDs and put them into such servers, your performance gets better( we guess because of better communication between Controller and Disk), but nowhere near the advertised performance(~20% of that).

So the ProLiants Gen7/8 SAS Controller, are simply not made for SSDs. It would be interesting if this bottleneck still exists with Gen9, because that way you can only connect one disk via SlimSATA to a Gen7/Gen8(and that only via putting the disk into the chassis and not in the slots)