Re: [PVE-User] pve wiki docs wrong -- shared zfs via iscsi isn't possible

Re: [PVE-User] pve wiki docs wrong -- shared zfs via iscsi isn't possible

[Uwe Sauter]

I think "shared" is used in the sense of "can be accessed from different hosts" but not "simultaniously".

Like every other block device that is available over the network it is up to the file system to coordinate 
simultaniously access. ZFS is unable to do so. But that doesn't mean that it cannot be used from different hosts (at 
different times).

So this depends on your POV whether ZFS over iSCSI is "shared". But technically "shared: true" is right.


Am 29.02.24 um 20:05 schrieb Roland via pve-user:
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Re: [PVE-User] pve wiki docs wrong -- shared zfs via iscsi isn't possible

[Dominik Csapak]

i think there is a misunderstanding here what zfs over iscsi actually does

zfs over iscsi does not mean we put zfs on an iscsi exported volume,
but rather the target exposed iscsi volumes that are created there via zfs

we then control (via ssh) the creation/deletion/renaming of said zvols
and use the set iscsi software (e.g. lio) to export them as iscsi luns

that way pve can use those iscsi luns as volumes for vms, make snapshots
(via ssh on zfs on the target) etc.

with this in mind i think it's obvious why the storage is marked
shared

regards
Dominik

Re: [PVE-User] pve wiki docs wrong -- shared zfs via iscsi isn't possible

[Dominik Csapak]

On 3/1/24 09:07, Roland wrote:
> ouch,
> 
> ok, i see "ZFS over iSCSI" is being used as naming in proxmox for that ,
> but it's a little bit misleading
> 
> maybe "iscsi luns hosted on zfs" or "zfs exported iscsi luns" would
> better describe it, but ok, it's like it is now....
> 
> thanks for making it clear.

yes the naming has brought confusion in the past, but we did not
come up with anything better (but not overly long) yet

> 
> btw, can you fix the link to ZFS-over-ISCSI page at the bottom of
> https://pve.proxmox.com/wiki/Storage ? i don't have edit permission there.
> 
> it points to https://pve.proxmox.com/wiki/Legacy:_ZFS_over_iSCSI legacy
> page, whereas that page is now at
> https://pve.proxmox.com/wiki/Legacy:_ZFS_over_ISCSI  (mind it large I in
> ISCSI)

i sent a patch to the devel list, since those pages are autogenerated
from our docs:

https://lists.proxmox.com/pipermail/pve-devel/2024-March/062051.html

regards
Dominik