RN102 change disk, read-only data volume after delete a SMB Share

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xaviermn wrote: I have I new WD Red compatible disk

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If this is a WD Red, then I suggest exchanging it for a WD Red Plus or a Seagate Ironwolf.

WD Reds are now SMR drives (Shingled Magnetic Recording), which don't work well with ReadyNAS.  There can be substantial performance issues when doing a lot of writes to the volume.

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xaviermn wrote:

With a RN102 with only one 2 Tb disk I have some SMB Shares and one Iscsi target. Yesterday I delete an SMB Share and since then I receive a message saying “There is an error on data volume and it’s turned on read only. We recommend doing a backup” (or something like this, I translate the Spanish message). 

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It looks like the error was triggered because you ran out of free space.

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xaviermn wrote:

1. I have I new WD Red compatible disk and I like to extract the current disk and save It (for try to recover and access old backups). Then install the new one and start a new backup set there. When I will start the NAS with de new disk It start from the scratch? with original factory firmware? I have to configure RNAS Name, IP, shares and iSCSI targets?
2. jWhat about save current NAS configuration file and restore it on the RNAS with the new disk? It maintains SMB Shares, iscsi targets, notification config etc.. (without data … but metadata)

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The NAS will start over when you do the new install.  But not from the original firmware.  The flash was updated to 6.10.10 when you upgraded to that, so the NAS will install 6.10.10 when it does the factory install.

There are a couple of settings that aren't restored - volume quota is one.  I don't recall if there are any others.  Personally I document my settings first (taking screenshots of important config settings).  And then just re-configure the NAS manually.

That said, you should be able to save the NAS config file first, and then restore it on the new setup. I'm not certain on iSCSI - it's not something I use.  But I think the NAS will re-create the target.  You will need to re-format it from the client. 

If you are using any apps, you will need to reinstall those on the new setup before you restore the config.  Reinstalling will be difficult, since 6.10.10 won't let you do that from the web ui, and there are also some changes you'd need to make to the apt configuration.  Post back if you are using apps, giving us more details on what apps you have installed. 

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xaviermn wrote:

1. The critical point is that the Iscsi target is used to backup purposes. Can’t I connect and extract data in read-only mode? My first try gives an error, but I don’t it’s because I try to write a file first

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Not something I've tried (as I said I don't use iSCSI myself).  

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xaviermn wrote:

1. If I stop de RNAS and start with one or other disks (the old one, and the new one) it’s like if I use two independent RNAS ? I think this is the best config for me: config the new backup set on new disk and save the old one as an independent NAS.

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You can do that, but the current disk remains read-only anyway.  The config files are all stored in the NAS OS partition, so it is like two independent RNAS.

You can also use FlexRAID and set up each disk as its own volume.  You'd need to configure shares (and any iSCSI targets) on the appropriate volume, and you'd need to use unique names for each share (no matter what volume they are on).  If you take this path, you'd need to restore the data you want to preserve from the current disk from a backup.

FWIW, if preserving the backups on the NAS matters to you, then you should put a backup plan in place for the NAS - saving copies on USB drives, or potentially in cloud storage.