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Hi Marco,
October 6, 2025 at 1:32 PM, "Marco Gaiarin" <[email protected]
mailto:[email protected]?to=%22Marco%20Gaiarin%22%20%3Cgaio%40lilliput.linux.it%3E
> wrote:
>
> Mandi! Alwin Antreich via pve-user
> In chel di` si favelave...
>
> >
> > Hm... I assume you're running a RAIDz1?
> >
> root@lamprologus:~# mailto:root@lamprologus:~# zpool status rpool-data
> pool: rpool-data
> state: ONLINE
> status: Some supported and requested features are not enabled on the pool.
> The pool can still be used, but some features are unavailable.
> action: Enable all features using 'zpool upgrade'. Once this is done,
> the pool may no longer be accessible by software that does not support
> the features. See zpool-features(7) for details.
> scan: scrub repaired 0B in 1 days 15:06:52 with 0 errors on Mon Sep 15
> 15:30:54 2025
> config:
>
> NAME STATE READ WRITE CKSUM
> rpool-data ONLINE 0 0 0
> raidz1-0 ONLINE 0 0 0
> scsi-35000c500d2ae07db ONLINE 0 0 0
> scsi-35000c500d2ae767f ONLINE 0 0 0
> scsi-35000c500e24688cf ONLINE 0 0 0
> scsi-35000c500d2af2d43 ONLINE 0 0 0
> scsi-35000c500d2aee0df ONLINE 0 0 0
> scsi-35000c500d2af4693 ONLINE 0 0 0
> scsi-35000c500f9797483 ONLINE 0 0 0
> scsi-35000c500d2ae777f ONLINE 0 0 0
> scsi-35000c500d2af3e77 ONLINE 0 0 0
>
> errors: No known data errors
>
> Yep.
>
> >
> > See the link:
> > https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysadmin_zfs_raid_size_space_usage_redundancy
> >
> OK. But this can explain some data, not 20TB of not reclaimed space; and, as
> just stated, if i delete now (after that i've set discard=on on volume
> property) data, space get correctly reclaimed.
>
The parity is calculated for data written and by the docs [0], it is 8K zvol
block + 4K parity (50%). See also the openzfs docs [1].
By that calculation you'll need 512 GB for every 1 TB written. That means that
the 2TB disk will use 3TB on ZFS, plus some extra.
I hope this helps.
Cheers,
Alwin
[0]
https://pve.proxmox.com/pve-docs/pve-admin-guide.html#sysadmin_zfs_raid_size_space_usage_redundancy
[1] https://openzfs.github.io/openzfs-docs/Basic%20Concepts/RAIDZ.html
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