[SOLVED] With multiple VDEVs in a pool is RAID-Z2 useful?

[WhiteTiger]

In the server I have 25x300GB HDDs. I work with VMs. Server has 64GB.
2 HDDs are used in mirroring for Proxmox.

I was thinking of creating a pool with 3 VDEVs with 7 HDDs in RAID-Z2.
In this way 2 HDDs are left over.

But if the data is spread over the whole pool, then maybe 4 VDEVs with 5 HDDs in RAID-Z1 is better, right?
This leaves 3 HDDs left over and with approximately the same capacity in the pool.

I wonder if in this scenario in a VDEV I lose 2 HDDs, can I still keep the data?

How can I use the advanced disks?

Thanks in advance for the help.

 

[WhiteTiger]

I have already checked, with RAID-Z1 in the individual VDEVs if I lose two disks in the VDEV I still lose the data.
Thanks anyway.