TrueNAS expand Pool with a mismatched VDEV

[Noah0302]

Hi guys,

 

I currently use a TrueNAS machine as a Backup for my VMs and other things with 5x2TB Pool in Z1, but it is running out of space quickly.

My I dont have enough space for 5 more 2TB drives, so I thought about adding a 3x4TB VDEV in Z1 aswell.

 

That should mean, that I will get 8TB more of usable space, but only 1 drive redundancy for each VDEV, right?

I just want to make sure, since I dont want to waste my money on drives, which wont work as I intended them to do.

 

Thank you in advance!

[AbydosOne]

22 minutes ago, Noah0302 said:

I just want to make sure, since I dont want to waste my money on drives, which wont work as I intended them to do.

Yes, that should work. Just be careful with your configuring, as adding VDEVs is a one way process.

[Noah0302]

Thank you for the reply!

 

I just wanted to make sure, since I tested it in a VM with 20 and 40GB drives and TrueNAS displayed a warning that mismatched VDEVs are not recommenden.
I dont really understand why, since each VDEV has a 1 drive parity.

[AbydosOne]

Just now, Noah0302 said:

TrueNAS displayed a warning that mismatched VDEVs are not recommenden

There is a bit of a performance quirk where "more drives faster" so having different speed VDEVs will limit the array to the slowest one, but your two VDEVs aren't horrendously different, and I doubt you're doing anything very mission critical.

[Noah0302]

2 minutes ago, AbydosOne said:

There is a bit of a performance quirk where "more drives faster" so having different speed VDEVs will limit the array to the slowest one, but your two VDEVs aren't horrendously different, and I doubt you're doing anything very mission critical.

Ah, ok I see.

 

Yes, it is actually not even a disaster if I were to fuck up adding the VDEV and losing all the data.

Im just replicating the data from my main Server once a week to this one in question, Id still have all the data.

My main point is just wasted money, haha.