Can a ZFS Pool from Proxmox be imported into TrueNAS

[Griff1962]

Trying to migrate from Proxmox to TrueNAS 12, Proxmox version 6.2-11 ZFS version 5 (no special features implemented) would like to import a multi TB ZFS Pool from Proxmox to TrueNAS 12 but I do not see any discussion around importing Linux ZFS to TrueNAS, are there any special considerations before I shutdown my Proxmox system? Can I do this? Will the Pool be usable? Will it be available via Read-Only only or can I write to the imported ZFS pool in TrueNAS, if the imported ZFS pool is available via read-only would it be smart to create ZFS snapshots of the datasets before exporting? Are there any other considerations before shutting down my Proxmox system to make the ZFS Pool more acceptable/importable to/by TrueNAS?

Any and all assistance is greatly appreciated.

 

[Ericloewe]

ZFS version 5

That's the filesystem version, which hasn't changed in a long time. Most likely, you have a v5000/feature flags pool, so you'll need to confirm that your feature flags are compatible (see here for details).

Generically speaking, the expectation is that TrueNAS 12.0 supports all feature flags with the exception of skein, but it's conceivable that Proxmox does something unusual.

The only real point of friction beyond that tends to be ACLs and the like, which are handled differently on Linux. I'm not familiar with the specifics, but they're stored differently and are thus incompatible.

 

[Griff1962]

So based on your statements above and the data below, would make more sense to export the ZFS Pool, import it and then do a ZFS send from snap shots created in the old pool to a new pool that is being created? Just trying to make sure I don't end up with an unusable/accessible ZFS pool. Or would it make more sense to copy this data to multiple external lvm devices and then migrate that data to new FreeNAS ZFS pools once they are created?

Your right, the ZFS version information is below:

zfs-0.8.4-pve1
zfs-kmod-0.8.4-pve1

The following flags/features are in effect:

NAME	PROPERTY	VALUE	SOURCE
Pool-B	aclinherit	restricted	default
Pool-B	acltype	off	default
Pool-B	atime	on	default
Pool-B	available	5.63T	-
Pool-B	canmount	on	default
Pool-B	casesensitivity	sensitive	-
Pool-B	checksum	on	default
Pool-B	compression	on	local
Pool-B	compressratio	1.00x	-
Pool-B	context	none	default
Pool-B	copies	1​	default
Pool-B	createtxg	1​	-
Pool-B	creation	Wed	20-May-20​
Pool-B	dedup	off	default
Pool-B	defcontext	none	default
Pool-B	devices	on	default
Pool-B	dnodesize	legacy	default
Pool-B	encryption	off	default
Pool-B	exec	on	default
Pool-B	filesystem_count	none	default
Pool-B	filesystem_limit	none	default
Pool-B	fscontext	none	default
Pool-B	guid	16239577119161062950	-
Pool-B	keyformat	none	default
Pool-B	keylocation	none	default
Pool-B	logbias	latency	default
Pool-B	logicalreferenced	54.5K	-
Pool-B	logicalused	13.8T	-
Pool-B	mlslabel	none	default
Pool-B	mounted	yes	-
Pool-B	mountpoint	/Pool-B	default
Pool-B	nbmand	off	default
Pool-B	normalization	none	-
Pool-B	objsetid	54​	-
Pool-B	overlay	off	default
Pool-B	pbkdf2iters	0​	default
Pool-B	primarycache	all	default
Pool-B	quota	none	default
Pool-B	readonly	off	default
Pool-B	recordsize	128K	default
Pool-B	redundant_metadata	all	default
Pool-B	refcompressratio	1.00x	-
Pool-B	referenced	186K	-
Pool-B	refquota	none	default
Pool-B	refreservation	none	default
Pool-B	relatime	off	default
Pool-B	reservation	none	default
Pool-B	rootcontext	none	default
Pool-B	secondarycache	all	default
Pool-B	setuid	on	default
Pool-B	sharenfs	off	default
Pool-B	sharesmb	off	default
Pool-B	snapdev	hidden	default
Pool-B	snapdir	hidden	default
Pool-B	snapshot_count	none	default
Pool-B	snapshot_limit	none	default
Pool-B	special_small_blocks	0​	default
Pool-B	sync	standard	default
Pool-B	type	filesystem	-
Pool-B	used	14.9T	-
Pool-B	usedbychildren	14.9T	-
Pool-B	usedbydataset	186K	-
Pool-B	usedbyrefreservation	0B	-
Pool-B	usedbysnapshots	0B	-
Pool-B	utf8only	off	-
Pool-B	version	5​	-
Pool-B	volmode	default	default
Pool-B	vscan	off	default
Pool-B	written	186K	-
Pool-B	xattr	on	default
Pool-B	zoned	off	default