Seagate ST3000VN000 (3TB) in ReadyNAS Duo v2 (Edit: Duo V1)

First check which version of the duo you have:
http://www.rnasguide.com/2012/01/09/how ... -or-nv-v2/

What firmware is on the duo ?- we can determine the version from this too.

Do you have a backup?

If you purchased around the time you joined the forum, then you have a duo v1. That is also consistent with your symptom (931 GB reported capacity on a 3 TB drive).

Thanks for the replies!
Looking at the rnasguide it looks indeed like I have a V1. I was duped by the label underneath which says RND2110 v2 (!)
...and yes, the NAS was purchased November 2010
The firmware is RAIDiator 4.1.10 [1.00a043]
I note in the HCL for the Duo v1 that there are no drives bigger than 2TB ...so I suppose I have no chance with a 3TB drive?
I have not taken a backup as such - the NAS is used primarily as a backup device so the data is on the various PC's. Of course I also have a copy on the 1TB drive that I took out - despite slowly increasing bad sectors, it does work. I could back the NAS up onto one of the PC's if needed.

2TB drives are the max supported. Sparc ReadyNAS have no GPT support.

The Duo was released back in early 2008 and is the last model we released which does not have GPT support.

Thanks for the confirmation.
I would have stuck with 2TB if I had not misinterpreted that pesky "v2" on the unit!
So...
I was hoping to give my ReadyNAS a new lease of life by upgrading the disks to 3TB - I am not certain that this makes sense with 2TB as what I should be backing up now is already well beyond the 1TB that I have. So maybe a new NAS is the way to go: 5 years (faultless operation, including correctly managing the failure of one and impending failure of another drive) for the existing Duo is not bad. So though I would be heavily biased towards another ReadyNAS, they don't seem to get great reviews at the moment. Any thoughts on that?

Well it depends what you're looking for. If you're looking for a NAS which is stable and where a lot of attention has been given to provide the best protection possible for your data then in my view you can't go past the ReadyNAS

We've put a lot of effort into using BTRFS, a much better filesystem than EXT4. With features such as unlimited snapshots and bitrot protection against media degradation we've been able to bring features normally only found in the enterprise.

These complement backing up your data nicely.

Thanks mdgm,
I do like the sound of the 102 and 104, and have been looking at the X-RAID calculator tool. http://rdconfigurator.netgear.com/raid/index.html
I wonder if you can answer a question...
For migration, sounds simple to put a blank 1TB disk in the new NAS, and copy over the existing data. Then put in the 3TB disk.
If I go for the 102, I have 1TB X-RAID, which would increase to 3TB when the 1TB disk is changed for a second 3TB - fine.
If I go for the 104, I also have 1TB at first, but the raid tool tells me that if I then add a 3TB disk, (leaving the 1TB & 3TB in place) data capacity increases to 4TB. Sounds nice, but my question is what will happen if (WHEN is more accurate, as it is a non-NAS drive a few years old) the 1TB disk fails. I then have 2x 3TB disk, which previously held 4TB of data. Presumably my whole array is non-redundant until I put in at least another TB of disk. Or if I am not using more than 3TB, in X-RAID smart enough to reduce the size of the array and leave me with 3TB of redundant storage?
(PS: Any white papers on how to get 4TB of storage from 7TB of hard disk?)

You might as well put both 1tb and 3 TB in , set up the volume, then copy the data over.
You are correct in most of your reasoning.
If you have a 1 TB disk and two 3 TB disks the nas will create a raid 5 array using 1 TB of each disk, and a raid 1 array using the remaining 2tb of each of the 3 TB disks, leaving you with approximately 4 TB of space.

If there is a disk failure then the volume will not be redundant until you replace the disk, whichever disk it is. The volume cannot be reduced in size without a factory default.

Thanks vandermerwe,
Your answer explains how X-Raid get the 4TB from 7TB of disk; obvious when you hear about it: to combine RAID-1 and RAID-5 to maximise data capacity - but very clever. If the 1TB is replaced by another 3TB, then I can see how - and I guess it will - X-RAID will convert everything into RAID-5 for 6GB data.

ReadyNASinUK wrote:
Thanks vandermerwe, Your answer explains how X-Raid get the 4TB from 7TB of disk; obvious when you hear about it: to combine RAID-1 and RAID-5 to maximise data capacity - but very clever. If the 1TB is replaced by another 3TB, then I can see how - and I guess it will - X-RAID will convert everything into RAID-5 for 6GB data.

Yes, when you upgrade the final 1 TB drive you'd have 3x3TB and a 6 TB volume size.

You would have two layers (a 3x1TB layer and a 3x2TB layer). This is not visible to users though if you poke in the logs or with SSH you can see it. So it is slightly different than a factory install with 3x3 TB, but not in a way that matters to users.