А так все, сваливаю на raid6 mdadm +xfs. Скоростью хоть побалуюсь.
У Вас же как я понял proxmox? Выжимка из документации:
Supported Technologies
ZFS
If you want to run a supported configuration, using a proven enterprise storage technology, with data integrity checks and auto-repair capabilities ZFS is the right choice.
Unsupported Technologies
mdraid
mdraid has zero checks for bit-rot, data integrity, and file systems commonly used on top do not provide that either.
That means, if some data gets corrupted, which happens on any long-running system sooner or later, and you normally do not notice until it's too late. So, Proxmox projects do not support this technology to avoid that users that are not aware of this and its implications run into these problems! Its user experience is also less polished than that of ZFS, and while it might provide slightly more performance in some cases, this is only achieved due too not having the safety-guarantees that, e.g. ZFS provides.
https://pve.proxmox.com/wiki/Software_RAID