Replace whole Pool (ZFS Raid5)

[Oekel]

Hi,

I am standing befor an "old" FreeNAS with 4x encrypted 6TB HDDS plus an small SSD with the OS.
All over is filled up to a critial state of 98% and even SMART of one HDD is reaches "defect".

So what I allready did is to order 10x 14TB HDDS (not all for my new NAS but available now)

Could you tell me in details, what whould be best practise to migrate to newest TrueNas AND newest pool?

1. Should I create a (non encrypted) copy of all data at the 14TBs via USB?
   • If so how to mount them and how to start copy process?
2. Should/Can I create a new Pool out of 4x 14TB?
   • If so should I Update OS first to support newest Pools and encryption?
   • Can I Update old ZFS to new ZFS2.0 on the fly (with data on disk)?
   • What did "update Pool" meens in detail?
   • Must there be an order on which SATA/USB-Cabe the HDDs are connected?
     • If not how will FreeNAS/TrueNAS identify them?
3. Is is possible to replace one 6TB HDD with 14TB after the other and restore system?
   • Will there be the max capacity at the end?
   • Will the whole system be up to date regarding all previous steps, if I do it (for testing) like that?
   • Just for practicing (the worst case of Raid5) I would like to go this way ONCE in my life.
     • What are the things I should avoid (to have less work)?
     • What are the things I MUST avoid (to do not lose data)?
     • Can I destroy/restore FreeNAS Partitions, when I saved config?
       • Is it just one file?

Hopefully, everyone can understand my thoughts and point out some DAU-Questions ;)
Please be gently, becaurse the source-system was my first FreeNAS and should not be the last one I love.

Greatings Oekel