Raspberry how to transfer omv root from SD to SSD

I am trying to work on a prototype based on Raspberry 3 with SSD, the target platform will be an Odroid HC2 with HD for both omv and nextcloud.
After downloading the image and transferring it to SD, the first problem is to transfer the system on SSD.
I mounted the /dev/sda1 as /mnt and I copied the system folders with the command rsync -axv / /mnt.
I changed the root path on cmdline.txt to point to /dev/sda1, then I appropriately modified fstab on copied system and reboot it, as I did several times on Raspberry.

It seems to be fine, at the reboot the system boot from SSD and I can logging in by ssh.
However the graphical interface doesn't work, because nginx has failed.
It has failed because doesn't exist the file /var/log/nginx/error.log, so says the system journal.
But I have checked that the folder and file there were on SDD before the reboot... Now are missing, did the reboot cancel them ?
I tried to define the missing folders and files by mkdir and touch while the system was running.
At the reboot the interface starts, but I can't logging in as admin. It waits for a moment, checks the password, and after it asks again for the credentials to login.

There is a way to bypass those problems ?
Or there is another simple way to transfer omv system from SD to SSD/HD on Raspberry and Odroid ?
Thanks.

Zitat von tkaiser

What do you want with a RPi? Horrible choice for a NAS or anything related to network and/or storage. On the ODROID HC2 you partition the SSD and then use nand-sata-install to move the rootfs from SD card to the SSD (the SD card needs to remain in the slot since the 1st stage bootloader can only live there).

I know the hardware restrictions of Raspberry... indeed, as i wrote, I choose to use an Odroid for the target NAS.
I'd like to understand why such issues come out.
Because using nand-sata-install my doubt is if the moved system to SSD of Odroid has the same behavior then of the Raspberr, i.e. nginx will not work at all.
Can anyone explain me? Thx.

This might be a reason. But I guess Armbian running on the Raspberry would have to be in charge of managing web components, folders and files, not directly ThreadX that is a inner layer...
Anyway I'll try to follow your advice in next days, when the new HC2 will arrive.
Thank you.

Zitat von tkaiser

As such nand-sata-install doesn't work on the RPi ......

I agree with you, I already had tried before with it and I couldn't use it on RasPi