OpenZFS 2.0?


New Member
Feb 23, 2021
Boston, MA, USA
You are probably not using zstd but lz4 instead.
Well yes, all the existing pools were using lz4.

I was asking about upgrading them to use zstd.

So far I've set the compression=zstd-10 (I went aggressive because I know I won't be CPU-bottlenecked on writes. The default if you don't specify, compression=zstd is equivalent to zstd-3) property on my storage datasets, and have just left my boot rpool as-is.

So I was curious what the results would be about changing that one too. I know there's been some discussion of adding zstd support to bootloaders, and even using it as the kernel image compression format, so the advice and obstacles are still constantly changing around this feature.
Last edited:


Proxmox Staff Member
Staff member
Jul 28, 2015
South Tyrol/Italy
I currently don't have anything specific in mind for GRUB and would hold off enabling zstd compression for the root pool.
But if you're using UEFI and did the setup with PVE 5.4 ISO or newer, you're using the VFAT EFI system partition to boot anyway (kernel and initrd are saved there) so its safe to do there as ZFS is not involved in the initial boot process.
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