[Is it easy to migrate old data?]

Yes I do.  some of my data was placed in a mirrored software RAID managed by madam under linux. you mean Parity is not as safe as Raid1 ,do you?

[Is it easy to migrate old data?]

12 minutes ago, trurl said:

You need at least one disk to start an array with, and Unraid must format any disk it will use in the array or cache pool. If you can empty one of those disks, preferably one of the larger ones, you can use it to start, then mount one of the other disks with the Unassigned Devices plugin and copy its files, then add it to the array, repeat.

So the procedure is :

1, I add the UD plugin.

2, I try to empty a larger hdd ,and add it to the array, without adding a parity or a buffer,then start the array.

3, I copy data (in command line with cp or midnight commander )to fill the array to empty another hdd,

4, I stop the array, add the newly emptied disk, without adding a parity or buffer, and start the array.

5,I loop over 3 and 4 till all hdd is added (but still no parity or buffer).

6,Then I need a disk as parity and it should be the largest one in their volume.

Am I understanding it right?

[migrate from mdadm under linux]

thanks. finally I got my files by reboot the machine with a ubuntu live CD.

[Is it easy to migrate old data?]

Hi, I am considering move from openmediavault to unraid. however I have 21 hdds range from 0.5~4TBs in ext4 file system almost filled with data.50GB of free space in average and  I do not have any other free hard drives. Is there any easy (and safe) way for me to migrate my data to unraid if I purcharse a pro license? Thank you!

[migrate from mdadm under linux]

Hi, I need to migrate my data to unraid. I replaced my old linux system with unraid. however there are two disk on mine are mantained by mdadm under linux and  created as mirror (raid1). I installed the plugin "Unassigned drives" but it shows the to disk labeled "FORMAT" in grey and not allowed to operate. So is there any easy way for me to mount the raid under unraid and copy data to new array with out install another operate system? Thank you!