Can't add mirrored metadata vdev

[niah]

I have a pretty basic setup with 3 data vdevs, each are 4 drives in raidz1. On TrueNAS Scale 23.10.0.1
I'm trying to add a metadata vdev with 2 SSDs in a mirror but it looks like the interface won't allow anything other than raidz1. From what I can tell online it seems like TrueNAS Core allows you to do this but you need to go through a warning and an override button. Is there a reason for this or a way to override this behavior?

Any help is appreciated

 

[HoneyBadger]

Hey @niah

This was a UI bug that should actually be fixed in the latest SCALE 23.10.1 - which just released today.

Note that because your data vdevs are RAIDZ, if you choose to add a special vdev to this pool, it will be a permanent fixture - there won't be a way to remove it afterwards.

 

[Davvo]

Just a heads up: depending on the size (>2TB) and type (I'm guessing you are using HDDs) of the drives, 3 VDEVs of 4 drives in RAIDZ1 are quite risky. Plan accordingly.

Suggested read:

Assessing the Potential for Data Loss

This guide was written to be read from top to bottom without jumps, with the intent of spreading awareness to both new and experienced users; the author of this document assumes the understanding of the concepts explained in the following...

www.truenas.com

 

[niah]

How convenient, I've just updated and it's now working. Thanks!

Also thanks Davvo, This is a homelab environment and I'm more or less experimenting with things currently. Each vdev is performing much better than I thought so I'll probably move to 2 VDEVs in RAIDZ2 at some point in the future. Also my backups are pretty solid so I'm not that worried.

 

[Davvo]

Glad to hear it, just remember it's a destructive operation.