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@GreyLinux - The "flexi sata cables" was a MUST to fit the 5 drives. I have used SimpNAS with sucess, works for the most "out of the box" with many of the sata cards i used. Now i run Armbian buster and OMV again, the reason is i use OMV on my other machines. And also that i can boot from the sata card and no sd or emmc is needed.

@GreyLinux - I can not take credit for SimpNAS, but i did use it very much with my rockpro64 setup. Used it much to test 10-14 sata cards, and many was able to work with Focal with mainline and SimpNAS. Right now i use Armbian buster with mainline and OMV. But as yourself i also like the simple in SimpNAS ;-)

@Mathias @GreyLinux - Some pics of my "dirty" setup.

@JackR - Looks interresting, could be very cool.

@Mathias - The Sata pcie card is this one with the power cables from pine store, and from one of the power cables to this splitter - So now you have 5 power cables so to speak. - I use the upper sata port (5) to boot my ssd up from, auyfan' uboot can boot from that port. ROCK solid, no down time. Only on kernel updates ;-) Just updated to 5.8.16 12V 10A power adapter.

@Mathias - I do run all drives from the sata adapter cables from pine store. Maybe some sort of a "dirty setup" - But hey, it works no down time at all. Hmm... Will some pictures help, from inside the my nas case?

@GreyLinux - You could purcahse a Noctua FLX 80mm fan, and heat will not be a problem, if you have such.

@GreyLinux - That sata card is indeed a very good choice, i have now run with same card, just with 5 ports. Rock solid, i havent had any down time at all. I have installed a 92mm Noctua fan, i did cut the hole bigger. But before that i did run with a 80mm Noctua fan, it is indeed 25mm deep, but it can fit. The one sold as orginal is around 14mm or so. The fan runs very low rpm. rmmod pwm-fan echo 0 > /sys/class/pwm/pwmchip1/export echo 110 > /sys/class/pwm/pwmchip1/pwm0/duty_cycle echo 500 > /sys/class/pwm/pwmchip1/pwm0/period echo 1 > /sys/class/pwm/pwmchip1/pwm0/ena

@GreyLinux - I just did put the fan settings in /etc/rc.local the fan runs always but nearly silent. My 4xHDD temps runs very low, between 34-36° the SSD hits 37-39° I did mange to fit 5 disks in the NAS case. What sata card do you have?

@GreyLinux check this topic out for fan control

@Meier @aldrick I do have rockpro64, i have only experinced kernel freeze with some crap sata pcie cards, and yes card from pine64 stores is one of them. I run Armbian buster with kernel 5.8.13. I use OMV5 with no problems what so ever, i did update spi bootloader from ayufan, installede armbian on ssd. Boot up from and run from SSD, + 4 disk attached (1x480GB SSD, 2x3.5" 2x2.5"), i did write 4TB on one of the disks, yesterday.. No problems.. ROCK64, i have not used that board for a long time, the usb ports acts like my girlfriend when she is mad.

@Dunc4n1d4h0 - To go from dtb to dts, edit and make to dtb again, is something like. dtc -I dtb -O dts -f rk3399-rockpro64.dtb -o test.dts code testfile.dts dtc -I dts -O dtb -f test.dts -o rk3399-rockpro64.dtb

@usual user - Do i understand you correct. Lets say if i want to change Hz as @Dunc4n1d4h0 suggests, it can be changed in dts, if fdt_overlay_patch.txt is applied? If you have time, it could be very helpful if you can explain it in another way. Thanks.

@Dunc4n1d4h0 - Thanks, i will look at it tommorw, and pinn the thread.

@Dunc4n1d4h0 - And how to clear the settings, if the commands have been typed in once? And wants to change it?