I am using an ubuntu 18.04 computer in which I want to have a single logical volume (seeing all my drives as a single unit) but also having at least 1 drive fault recovery.
I have this setup in order to store family fotos:
- NAS SYNOLOGY with 4 TB raid 1
- Desktop PC with bunch of discs used for backups.
Backups of the different folders of the NAS are made regularly to the PC at the different disks. However, this is a bad solution because I have to do partial backups of the NAS to different discs and in case of total NAS failure/steal I am left with a bunch of unorganized discs old disks.
I initially thought to create a LVM with all the discs in the computer. This would solve the issue of having to create partial backups. However,this solution increases the risk of data loss. As far as I am concerned if one of the discs of the LVM fails all the LVM is lost.
I then thought of creating a raid 1 with the heterogeneous discs I have but I have not being able to find a proper solution.
Current drives I have for the backups are: 2x640GB 3x1TB 1x3TB
The reason I want to have at least 1 disc redundancy is that some of the drives are a bit old and barely used.
Is there any program/partition (LVM/AUFS + RAID 1) scheme that would allow this 1 logic volume and 1 disc redundancy?
Note: I know buying new disc is the easy and safe solution but I want to use the spare drives as backup, I am trying to achieve a "as best as possible setup" with current owned HW.
Note: I have also read about the possibility to use AUFS and snapRaid, but have not been able to compute the total amount of space I will be left at the end.