Thats a JBOD or raid0 and the PVE webUI won't allow you to do this as this is dangerous (lose one disk and everything is lost...so multiple times higher chance to lose all your data compared to just using a single 900GB disk). You could still manually create that using the CLI via LVM/mdadm/ZFS/btrfs and then add a new storage pointing to it (at Datacenter -> Storage -> Add).
If you do anything other than testing I would get a forth disks to create a raid10 to get 600GB. If thats not an option I would create a raid5 to also get 600GB.
For such small drive sizes, raidz2 is probably overkill and wasting disk space. You could rebuild it as raidz1
Raidz2 is commonly recommended for spinning drive sizes over 2TB, mostly due to the chance of a 2nd drive failing during rebuild and the time it takes to resilver.
At any rate though, you should always have regular backups of your zfs pool so you can restore if the whole thing decides to go poof
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