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Should I go ahead and mirror the two drives, or should I buy one more drive and setup an ZRAID1? Does ZRAID1 offer any advantage over mirroring, that would make it worth spending an additional $400 for a third 16TB expansion drive?

I have just ordered 2 additional disks (12tb) in order to extend the storage capacity of my TrueNas SCALE.

Currently my storage pool is 1 VDEV of 2 mirrored 12TB disks (the same ones I just ordered).

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So I inserted the 2 new physical disks into my server and created and associated 2 disks of the same capacity to the TrueNas Scale VM.

I then created a RAIDZ2 pool with the 4 disks (the 2 new physical disks and the 2 virtual ones).

Once the pool was created, I removed, from proxmox, the 2 virtual disks.

The pool has been downgraded, but it is functional.

I am replicating the data (via replication tasks).

And it will only remain to destroy the old pool and replace the 2 virtual disks removed from the RAIDZ2 pool by those of the old mirror pool.

In Problems trying to replace disk in truenas mirrored boot, I was trying to fix a failed drive on my mirrored TrueNAS boot pool. I flailed around and eventually got it booted with just one drive of the mirror (detached the other failed one).But then, stupidly, instead of zpool attach I used zpool add and now I have a double-size but zero-redundancy boot pool!

So how can I get it back to being mirrored? I know it's not going to be simple. Maybe I can create a new pool (I do have extra drives etc.), copy the data over, and make that pool the boot pool? I have no idea how to do that. Anyone?Or perhaps there's a way for me to add a third disk as a mirror of the other two? I'm guessing not, that seems like it would be complicated to manage anyway.

A mirror layout stores all data on every disk in the pool. This option has the absolute maximum redundancy available but at the cost of disk capacity. With a mirror, your usable disk space is whatever the size of a single disk in the pool can hold.

Adding a second disk to the TrueNAS boot pool will increase resilience of the TrueNAS installation in case the originalboot device fails - by creating a ZFS mirror (RAID1). This can be easily configured via the web UI or via the CLI. Theway of using the command line interface (CLI) is not well documented, so I documented it here.

Adding a mirror disk is a two-step process. Since TrueNAS ZFS mirrors are based on partitions and not entire disks, wefirst have to create the correct partition table on the new disk. In the following, I want to add the ada1 disk as amirror to the existing ada0 disk. Clone the partition table from ada0 to ada1 with gpart (effectively backing upthe ada0 partition table and restoring it on ada1):

Depending on the size of your boot pool, it might take a few minutes until the resilvering is complete. After that, alldata will be copied from your original boot disk to the new boot disk. You now have a mirrored boot disk (RAID1)!

I have 2 new 8TB drives ready to replace both drives in the mirror and physical slots in the drive cage to add both the new drives to the system while keeping the originals in place. Though as I understand it, the Faulted drive is completely dead and so I can just get rid of it and hope that the Degraded drive survives long enough to resilver a replacement. (Is that right?)

My question is, is it a good idea to add both the new drives to the mirror vdev and resilver them at the same time? Is that even a thing that works? Would ZFS read from the Degraded drive only once and resilver both the new drives at once? Or would it resilver one new drive from the original and then the second new drive from the original and the already-resilvered new drive? ff782bc1db