RAID 1 with 2x1TB SSD and 1x2TB SSD

  • Asked the question in git and a user votdev replied "There are plenty of answers depending on which technology you want to use, e.g. MD, BTRFS, ZFS."


    Can someone help with this? Tried to look for the solution online, but unable to word it correctly to show the right results.


    Intended to use these drives for Frigate recordings


    Thanks

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    • Official Post

    Yes, you can use them in a raid array but you will lose 1 TB of capacity from the 2tb ssd. Maybe if you mentioned why you want raid, it would be easier to help.

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    So I cannot use 2x1TB SSDs together to make them 2TB and RAID with a single 2TB SSD?

    Sure but you would have no redundancy with the 2x1 array. If you just want to use all of the capacity, use mergerfs.

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  • So I cannot use 2x1TB SSDs together to make them 2TB and RAID with a single 2TB SSD?

    You can combine all three drives using a BTRFS RAID1 profile giving you 2TB of usable storage with single disk redundancy. See: https://carfax.org.uk/btrfs-us…dg=1&d=2000&d=1000&d=1000


    Whether this is the best use of your drives is questionable. RAID is not a backup and you need to plan for the backup and restore of your data.

  • Making sure I understand this correctly. In my configuration, if either of 1TB SSD fail, my data will still be on the 2TB SSD, correct?

    Yes, I understand that. I have a 16TB HDD for backups

    MD RAID1 mirrors disks, a BTRFS RAID1 profile allocates space in "chunks" with two copies of both data and metadata. The "two" copies will be on two different drives. In the case of 2 x 1TB ( device A and B ) and 1 x 2TB SSD (device C). The mirrored "chunks" of data could be on A&B, or A&C, or B&C. If any one drive fails, there is still on copy of the data left which may be on either one of the two remaining drives.


    So, if either of 1TB SSD fail, your data is either on the remaining 1TB or 2TB SSD.

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