Shared Iscsi on mutltiple node

[m.patz]

Hello,

Sorry for the newby question but I want to be sure that I'll not destroy my (backuped datas.

Is it safe to share the same Iscsi target on two clustered PVE nodes?

My provider say that it's dangerous to have two node connected to the same Iscsi target unless if the system allow it.

I used lvm on Iscsi, maybe zfs over Iscsi is a better setup ?

Regards

 

[dietmar]

My provider say that it's dangerous to have two node connected to the same Iscsi target unless if the system allow it.

This needs cluster wide locking toö work correctly.

I used lvm on Iscsi, maybe zfs over Iscsi is a better setup ?

LVM over iSCSI works. We implemented proper cluster wide locking for that.

ZFS over shared iSCSI will never work (this is really dangerous).

 

[m.patz]

Hello,
Thanks for your answer.
So the following config is save to run on both node ? (in /etc/pve/storage.cfg)

iscsi: CbSan
    portal san-dcX-XX.rpn.XXXX.net
    target iqn.20XX-01.net.XXXX:XXXXXX
    content images

lvm: Nextcloud
    vgname CbSan
    content rootdir,images
    shared 1

Regards

 

[dietmar]

No, this is not safe! You need to set the 'base' storage for lvm:

lvm: Nextcloud
    vgname San
    base <iscsi-vol-id>
    content rootdir,images
    shared 1

 

[m.patz]

Hum,
I suppose that I cannot change it once I already (badly) create the lvm on Iscsi :s.

I think my mistake was to select CbSan as volume group.


But if Select Isci as base storage I have the following error, how can I debug it ?

I use PVE 6.1-8


Regards

 

[dietmar]

Seems you ISCSI storage is not active/working?

 

[m.patz]

Hello,
The ISCSI works as it used in the Nextcloud LVM.