Connect the same iscsi iqn to two servers

Question

Connect the same iscsi iqn to two servers

Guido 21

hi, I have a nas connected to a server via iscsi. I connected this nas with the same iqn to another server. It seems that at the moment it doesn't give me any problems, but my question is: does it involve problems? Is it a correct procedure? is it not recommended ?.
I would add, if I want to disconnect the iscsi unit, it won't, it warns me that there are active services, what control are they? and how to disconnect them?
Thank you

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Answer 1

Hey,

In order to work with a single iSCSI LUNs on 2 servers simultaneously you need to have a file system, which can coordinate I/O, as mentioned above CSVFS can handle it.
https://learn.microsoft.com/en-us/windows-server/failover-clustering/failover-cluster-csvs

For your case, it is easier to create SMB file share on your NAS and connect it on your servers. The fileserver could be created with StarWind VSAN as a fault-tolerant storage backend for a HA Fileserver. The following guide covers Failover Cluster process creation as well as HA File Share.
https://www.starwindsoftware.com/resource-library/starwind-virtual-san-for-hyper-v-2-node-hyperconverged-scenario-with-windows-server-2016/

Cheers,

Alex Bykvoskyi

StarWind Software

Note: Posts are provided “AS IS” without warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability and/or fitness for a particular purpose.

Guido 21 Reputation points

2020-08-09T11:14:39.267+00:00

this is perfect, thanks

Answer 2

Xiaowei He 9,936

Hi,

If the NAS storage is shared to different servers, it is normal and recommended that we connect the same IQN to different servers.

In my test, I have a Windows Server for storage, I created virtual disk with IQN: iqn.1991-05.com.microsoft:dc-target-n1-n1-target. This IQN is configured to allow node 1 and node 2 to connect.

If the reply could be of help, please help to accept it as an answer, thanks for your cooperation!
Thanks for your time!
Best Regards,
Anne

Guido 21 Reputation points

2020-08-06T09:40:00.55+00:00

perfect, I managed to do it. I specify that the two servers are of different domains. When a user of domain 1 creates or modifies shared shared files within the issi, the user of domain 2 does not see the added files and the changes. why?
TimCerling(ret) 1,156 Reputation points

2020-08-06T13:09:05.157+00:00

When you are connecting an iSCSI LUN, you should be connecting that volume to only a single system at a time, unless you are connecting the volume to be used a failover cluster. You should not be connecting the same LUN to two different hosts that are not configured into a failover cluster. That is almost a guarantee to corrupt the file system because the two separate hosts are not coordinating writing to the volume.

So if you are properly configured, i.e. each host is connected to its own volume, then the hosts do not have access to the other host's volume. That ensures that users in each domain will not see the other domain's volumes.
Xiaowei He 9,936 Reputation points

2020-08-07T06:12:22.717+00:00

Hi,

Agree with Tim, my test above is based on Windows Cluster environment, the shared storage is used for cluster. Since CSV can coordinate I/O between different nodes, so we can share the disk to different cluster nodes.

Thanks for your time!
Best Regards,
Anne

Answer 3

Guido 21

perfect, I managed to do it. I specify that the two servers are of different domains. When a user of domain 1 creates or modifies shared shared files within the issi, the user of domain 2 does not see the added files and the changes. Because?

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Connect the same iscsi iqn to two servers

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