I have a Synology 2-bay 211j NAS with 2x1TB HDD installed as single RAID 1 volume. I'm running out of space, so I'd like to upgrade my NAS with 2x3TB HDDs. Is there any easy way to copy all data from the earlier 1TB volume(s) to the new 3TB RAID1 configuration, without utilizing extra backup devices or additional NASs?
The solution is still applicable, even if you're using RAID1 instead of
As you mentioned you're using a 2-bay system, it won't make any difference anyway; the real benefit of SHR is when you're using 3+ disks, as they can be of different sizes and still minimize the wasted disk space.
Basically the procedure to upgrade a Synology is:
You still have a copy of your data on the 1TB disks, so if anything goes wrong, you can still recover the data manually. If that happens, it is strongly recommend that you do a full disk copy sector-by-sector (using dd on a Linux machine, or a tool like CloneZilla) before attempting recovery.
Despite the name, the
According to Synology's documentation this drive support their (I assume proprietary) Synology Hybrid RAID which according to this document allows you to replace one 1 TB drive with a 3 TB drive, then once the data is replicated to the new drive you can then replace the remaining 1 TB drive with the new 3 TB drive and the system will automatically expand out to 3 TB.
Of course, if it screws up, you could be SOL (of course you would have the first 1 TB drive that you removed).
The safest bet (IMHO) would be to either borrow or purchase a standalone 1 TB drive, backup your data to this 1 TB drive, re-init your NAS with the new 3 TB drives and then restore.