Newbie questions - how to cross server mirroring

[departy]

Hello. First of all, I am newbie with TrueNas(coming from synology) and since english is not my first language and new to OpenSource/DYU NAS in general i would like to ask few questions for guidance.

I have bought two Dell PowerEdge R720 servers. They each have VMWare ESXi installed and TrueNAS is running as a VM with 6 cores and 20GB RAM(I am experimenting and etc, so these params are not final, just for test purposes).

For the sake of my questions, each server have 2 x 6 TB drive storage (12TB per server).

Server 1:
A drive
B drive

Server 2:
C drive
D drive

They will be put into separate locations and each will be behind pfSense and site-to-site VPN tunnel.

My goal is to mirror:
A -> C
D -> B

I know it's probably not the best, but that's the case I really need at the moment.

My question here is:

How in TrueNAS I can connect Server 1 and 2 so they can see each other's disks. What software to use (Syncthing most probably will be used). I have two servers pinging each other, I just don't know how to make them see each other's disk and mirror each other. I need some guidance to what literature to read, terminology and how things are done usually in TrueNAS universe.

Sorry for my poor explanation, I need to do more reading, because I miss some of the terminology to express myself better.

 

[Samuel Tai]

My goal is to mirror:
A -> C
D -> B

Look under Tasks->Replication. It's not possible in TrueNAS to have each server directly control the other's disks, nor real-time mirror, but it is possible to periodically replicate datasets between them. See https://www.truenas.com/docs/core/tasks/replicationtasks/remote/.

 

[departy]

I see, i think thats all I needed <3 . Thank you so much Samuel!

Is there reeding with best practices on mirroring? I am still thinking if I i should buy few smaller hard drivers (total of 12 GB) or just 2 x6 GB? I need some sort of redundancy and later on backup.

 

[Samuel Tai]

For ESXi, you should have larger disks (so ZFS has an easier time finding free space), and wider mirrors (for better throughput).