this post was submitted on 21 Feb 2026
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To be perfectly honest, I don't know what GFS is, I have been a Linux sysadmin for a few years, but never came across that.
We used LVM and ext4 for the storage in those VMs
If you've got that experience under your belt, you'll be just fine. I haven't tackled zfs myself yet (I'm lacking the RAM, plus I was put off by the ECC RAM recommendation). But I know it unifies a lot of the things you're already familiar with under one roof (volume management and journaling) and adds more cool features (snapshotting, RAID, encryption, bitrot protection) without you having to combine and manage several different technologies (mdadm for RAID, LVM, LUKS, ...). I did that on my main rig and it turned out to be rather complex. Hence the switch to btrfs to at least squash a bit of complexity.
If you'd rather continue working with the storage technologies you know and avoid zfs, you may want to look into other OSs than TrueNAS (because that is zfs only). Two I'm running and can recommend are