Hi there! I own a Synology NAS 218j, 2 drives of 4TB in mirror config. I want to migrate my data from the Synology to a TrueNAS box I’m going to build. The issue here is, besides the 2 drives the Synology have, a have a spare drive laying around, in case of a failure of one of the NAS. Should I put the 3 drives in the new TrueNAS box or should I stick with 2 and save the third? I already know who to move the data from one NAS to the other.
Recomendations or best practices please!
Assuming that the nas you mentioned not understand ZFS:
you can be conservative and build the pool in TN as a mirror using 1 old Nas disk + the spare one; the third disk will be the spare, with data available for the first transfer/backup later in case of needs
otherwise, if you have fresh backups from where transfer data initially, in your place i would consider to build a raidz1 with all 3 disks and gain much space as possible (~8tb instead of the ~4 from the mirror)
