Zunderman wrote:

Are my thoughts right and can I make that partion without the risk loosing the data on the disk?

No, you will lose the data.

Zunderman wrote:

I am using XRAID.

Ok, so you are running RAID-1, with the disks mirrored. Mirrored disks isn't the same as backup btw. How much free space do you have in the array?

Normally you just initialize the LUN, and the LUN container file takes space on the RAID array (like any other file). A thick LUN will take the full allocated size right away. A thin LUN can be overallocated - it will grow as you put more files on it. The thick version generally works out better, but if don't have enough space you could make a thin one.

You could of course expand the array (buying two larger disks), and then create a thick LUN. If your NAS is running out of space, then that's the best solution (though of course it isn't free). A variant here is to upgrade to a NAS with more bays (say an RN214), migrate your current disks, and add one disk to it. That is more expensive, but would give you more expansion options later.

The other way to increase capacity is to create two jbod volumes. This is destructive, you will lose the data you currently have on the NAS. You'd do this by

back up all your files
uninstall your apps
switch to flexraid
destroy your current volume
create two new ones (one for each disk)
reinstall apps
recreate shares (some on each volume)
restore files from backup

When you're done you won't have any RAID redundancy, so it is even more important to have a backup strategy in place.

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