In my home case I have 32GB RAM and 3TB of the storage and my ZFS's settings are (4GB + 1GB of RAM for each 1TB of the storage):
root@pve:~# cat /etc/modprobe.d/zfs.conf
options zfs zfs_arc_min=4294967296
options zfs zfs_arc_max=8589934592
I also using following command in cronetab once a 24...
2.3.3 ZFS Performance Tips
ZFS works best with a lot of memory. If you intend to use ZFS make sure to have enough RAM available for it.
A good calculation is 4GB plus 1GB RAM for each TB RAW disk space.
3.8.7 Limit ZFS Memory Usage
It is good to use at most 50 percent...
As it was mentioned by @r.jochum you have wrong/corrupted iso uploded to Proxmox.
You have complete tutorial how to download MacOS recovery iso (BaseSystem.dmg) from the Apple software distribution server on Nick Sherlock website.
What is a reason to download iso from any other site than...