You can use Rsync for a full disk to disk copy - mirror. See this -> guide on page 59. This can be done from the GUI.
Wipe, provide a volume name, and format the new destination disk with the file system of your choice and run the Rsync command line, set up as shown in the guide. **In your case, be sure to leave out the --delete switch when setting up the command line. The --delete switch does not apply to your scenario.**
Note that the operation may take hours, depending on the amount of data. Also, other than the scrolling files list, there will be no "progress meter" or "percentage completed" indication. If you navigate away the page where the dialog box with files scrolling, Rsync is still working but there will be no indication that the job is in progress or complete. The only way to verify that the job has been completed, fully, is to run the command line again where no files will be listed. (Similar to the following.)
When the copy is complete and verified, redirect your shared folders to the new drive as indicated in the guide.
You can use Rsync for a full disk to disk copy - mirror.
I was thinking of dd instead of Rsync.
I am going to replace current 4TB disk on Odroid-hc2 with new 8TB.
Odroid-hc2 has only one USB port for external disk.
You still recommend Rsync in my situation?
Thanks for your reply.
dd will make an exact copy of your 4TB disk onto your 8TB disk. But the resulting copy will be only 4TB. You will need to expand the partition and expand the filesystem to have an 8TB fully usable disk.
I was thinking of dd instead of Rsync.
If you know how to set up the command line, dd will work. Note gderf 's comment about expanding the file system. After that's done, re-pointing shared folders to the new disk, within OMV's GUI, will work as well. Network shares and other services layered onto shared folders will follow to the new drive.
Odroid-hc2 has only one USB port for external disk.
Do you have a powered USB hub or a two slot drive dock? The Rsync example in the guide is for locally connected disks. A remote host-to-host copy is a different matter.
You still recommend Rsync in my situation?
Whatever you're comfortable with is the way you should go.
If you know how to set up the command line, dd will work. Note gderf 's comment about expanding the file system. After that's done, re-pointing shared folders to the new disk, within OMV's GUI, will work as well. Network shares and other services layered onto shared folders will follow to the new drive.
I don't think any repointing will be needed. The new disk should be indistinguishable from the old one except for the size.
You will need to expand the partition and expand the filesystem to have an 8TB fully usable disk.
And then maybe I can use 'gparted' to expand the partition after cloning through dd?
Whatever you're comfortable with is the way you should go.
Thank you for your comment on this.
I don't think any repointing will be needed. The new disk should be indistinguishable from the old one except for the size.
If the result is a true clone I believe you're right.
And then maybe I can use 'gparted' to expand the partition after cloning through dd?
Yes.
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