two volume - iSCSI LUN

[rickygm]

Hi forum , I am building a FreeNAS 11-u2 with multipath for proxmox HA to 10GB network, and I have two volume created, now I want to associate the target in iSCSI for these two volumes, but I have a doubt and I want your advice.

When associating the first volume I choose LUN 0 in both target

To associate the second volume I choose the LUN 1 in both target

But I'm not sure if this is the best practice.

iSCSIA --------> LUN 0 ------> volume1
iSCSIB --------> LUN 0 ------> volume1

iSCSIA --------> LUN 1 ------> volume2
iSCSIB --------> LUN 1 ------> volume2

thank for any help!

 

[rickygm]

Any help?


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[dlavigne]

Were you able to find the answer to your question?

 

[rickygm]

hi , no yet.


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[Thomas102]

Hi,
Everything I read about sharing iscsi target says you need to have some kind of "cluster" to synchronises the hosts when they access the shared block device.
I think this is the hard part you have to look for first.
I am on the way of NFS for this reason.

 

[Stux]

Hi,
Everything I read about sharing iscsi target says you need to have some kind of "cluster" to synchronises the hosts when they access the shared block device.
I think this is the hard part you have to look for first.
I am on the way of NFS for this reason.

If you are sharing a single block device amongst multiple clients, then the clients/block device need to be using a cluster aware fs. Most aren't.

Generally, you need to think of an iscsi LUN as a physical disk, connected via ethernet. You wouldn't connect a single harddrive to multiple computers at the same time... if you physically could... would you? They'd all write/read over the top of each other.

That's why you need to use a cluster aware FS... it *knows* about others reading/writing to the disk.

I don't know if ProxMox knows how to do this or not.

 

[rickygm]

Proxmox work very well with this https://pve.proxmox.com/wiki/Proxmox_Cluster_File_System_(pmxcfs) , My doubt here, which is the best practice of mounting several volume in iscsi.


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[genBTC]

I think if the cluster FS does support it, you can just do something like

and connect to 1 target from both clients, making sure they are aware that something else is also writing the target LUN behind its back.
That is pretty advanced so good luck :)