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I am not the author but i think this is the correct Link

Thanks Nemesiz. That explains slower write speed in relation to read speed. What I do not understand is that I have 6 SSD drives which are capable of doing each around 421Mbyte/sec sequential read and each drive is on a SATA3 6GBit/sec channel. Which should total 421x6=2526 MByte/sec sequential...

Thanks bogo22. That is really helpful! Maybe the ashift 13 could explain half of the performance. To give some more information on how the SSD drives are connected to the controllers The C2750D4I has the following SATA3 controllers Intel® C2750 : 2 x SATA3 6.0 Gb/s, 4 x SATA2 3.0 Gb/s...

Some more info iostat root@pve1:~# iostat -x 1 Linux 4.4.35-1-pve (pve1) 12/26/2016 _x86_64_ (8 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 1.37 0.00 2.78 0.16 0.00 95.68 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm...

Hi, Currently I am testing my new Proxmox 4.4 homeserver with following configuration 1x motherboard - Asrock C2750D4I C2750D4I 6x ssd - samsung 850 EVO 500GB ssds 4x memory 8GB ECC - Kingston Technology 8GB 1600MHz DDR3L Module KVR16LE11/8 1x power supply - be quiet! Pure Power L8 - 300W...