Migrating Raid 1 to Raid 10, data loss

raidsynology

I would like to ask if my method of migrating from existing Raid 1 to Raid 10 will cause any data loss.

I currently have a Synology DS 1515+, 5 Bays with 2 HDD in placed.

  1. 1st bay : 5Tb
  2. 2nd bay : 5Tb

Currently, it's in raid 1 and one of the disk failed (System Partition Failed).

Luckily, i can still access my data, except with no redundancy.

I had a plan to purchase 3 more 5Tb HDD in order to migrate to raid 10.

  1. Insert disk 5, do a full copy from raid 1 data to disk 5
  2. once completed, insert disk 1 to 4
  3. Do a full format and creates raid 10
  4. After Raid 10 completes, copy backed up files from Disk 5 to Raid 10
    Volume
  5. Leaves Disk 5 as a spare for any fail Hdd in the future.

I hope this could work without losing any data, hopefully this is the right way to safely migrate from raid 1 to raid 10.

Hence i would like to seem confirmation that this method would work.

Thanks all.

Best Answer

Yes, the steps you described should work. However, if your current single disk were to fail while you were copying data to disk 5, then you would loose all data. Therefore, I would suggest adding a step before step 1: insert a disk into bay 2 and regenerate the existing RAID 1 data onto disk 2, so you have a full RAID 1 backup of your data. Then, continue with the steps as you outlined them; insert disk 5, copy the data from the existing RAID 1 to disk 5, create the RAID 10, and copy the data from disk 5 to the RAID 10.

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