Readynas Duo X-RAID to RAID0

Yes you can mostly do that (note you don't really need to format the 2 TB drive, though it often goes smoother if you delete the partitions on a Windows system),

Copying the data back is the tricky step. Your 1 TB has multiple partitions, and is formatted with ext. So it can't be easily plugged into a PC. If the Duo doesn't recognize it for some reason, you would lose your data.

One option is to temporarily put the new 2 TB in a PC, and copy the data to that first. Then create a single Raid-0 volume on the NAS, and copy the data back onto the NAS. Then delete the partitions on the second 2 TB drive, and install it as a second volume on the Duo.

BTW, is this a v1? (4.1.x firmware?)

Thanks for the help. Yes, it is a v1. I've no idea about partitions, but I gather that having only the 1TB with the data would be risky. So I'll probably copy the data on the new 2TB, or another external drive, and copy it back. Problem is, that copying through network is hopeless, and direct ethernet connection gives only 15Mbps (not sure why, though). Any ideas to speed up the process? Maybe a USB backup through the NAS?

Just to make sure we are both using the same terminology:

When you say "direct ethernet connection" do you mean connecting the Duo directly to a PC via the ethernet ports? If so, you are using the term correctly. However, connecting the Duo directly to a PC (both with gigabit ethernet ports) should result in more like 25MB/s with is 200Mb/s. The capital B is Bytes the lower case b is bits. If however, your PC only has a fast ethernet port it is only capable of speeds up to 100Mb/s which would equate to about 12.5MB/s.

The slower speed is also the speed which I was getting through my network when I had only a fast ethernet switch. Changing to a gigabit switch, I was able to double the speed as I now had a gigabit (1000Mb/s) connection all the way from my NV+ to my desktop. Unfortunately, the USB2 connection won't be much faster. You are probably looking at something in the order of 20 hours if your 1TB volume is close to full.

Look in your manual about setting up a backup job. You can connect the USB drive directly to the Duo and configure a backup job to back up a share to the USB drive. (Each share that is used requires a separate backup job).

I haven't used USB backup with the NAS (everything is over the network). But from what I've read here, it is generally not faster and frequently is slower.

If you can sustain 15 megabytes/second then you can copy about 50 gigabytes per hour. So you'd be copying for about 20 hours.

15 megabits per second of course is another matter. That would take about a week to do the copy. If you are getting these speeds with jumbo frames on, then I would turn them off. Also check that you are using cat 5e or cat 6 cable.

PapaBear, SthephenB, thanks a lot!
Yes, I did mean a direct ethernet connection between the PC and the NAS. The speed is 15 MB/s, I misspelled it. I guess it's normal, then. The cable is cat5.
Thanks again

Generally cat 5 is out of spec for gigabit speeds. Though if the cable length is short enough, you can often get away with it. If you have a cat 5e or cat 6 patch cable, that might speed things up a little.

What version of RAIDiator are you running? There are known performance issues with RAIDiator 4.1.8. If after optimal performance I would suggest either downgrading to 4.1.7 (http://www.readynas.com/RAIDiator_4_1_7_Notes) or updating to 4.1.10-T3 (http://www.readynas.com/forum/viewtopic.php?f=17&t=59222)