Writeback/writethrough

[Archebo]

Hi!

How to change ZFS cache writeback/writethrough for PVE "on the go", to compare disk perfomance?

Thank you.

 

[t.lamprecht]

What do you mean with setting the ZFS cache to writeback?

You can set that cache modes for VM disks https://pve.proxmox.com/pve-docs/chapter-qm.html#qm_hard_disk_cache

Or add a cache for writes (ZIL) or reads (ARC (default exist) and L2ARC):
https://pve.proxmox.com/pve-docs/chapter-sysadmin.html#_zfs_administration
https://linuxhint.com/configuring-zfs-cache/

There's no "writeback/writethrough" mode for a whole dataset, one can set "sync" but I wouldn't touch that..