Readynas 102 adding a dics in bay 2 and copying

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LarsDN wrote:

 

First question is: I can only see the harddrive in Bay 1 in the admin overwiev but i "Volumes" I can see both.

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It sounds like you are using the default XRAID mode.

Adding the second disk converted your volume from JBOD (one volume on a single disk) to RAID-1 (one volume on two mirrored disks).  The resync process will mirror the entire disk to the new one, and writes to both disks will be done in parallel to maintain the mirroring.

Note while this does help protect your data, it is not enough to keep it safe (as many people here have learned).  You need independent backup to a different devices to do that. 

You could have switched to flexraid, and added the second disk as its own volume.  But that can't be done through the web ui now - you'd have to back up the volume, switch to flexraid, destroy it, create two new ones, recreate the shares, and restore the data.  Then create backup jobs on the NAS to copy the data to the second volume.  It's a lot of work for little benefit, as two independent volumes still aren't enough to protect the data (a power surge for example could damage both disks and the NAS).