topic LUN presented from one aggregate not showing on a Windows Server 2019 host. in ONTAP Discussions

LUN presented from one aggregate not showing on a Windows Server 2019 host.

ChristopherMCO — Wed, 04 Jun 2025 10:14:10 GMT

I have a Windows Server 2019 host that has multiple luns presented from our NetApp, spanning 3 different aggregates. When I create a new lun on the recently created 3rd lun, and add it to the proper initiator group, it never appears on the server. I can create luns on the other 2 aggregates and even move the lun from the 3rd aggregate to one of the other 2, and the lun appears on the host with no issues. I have tried adding the luns to multiple servers with different windows versions to be sure that it wasn't something like a recent update.

Is there something that maybe got missed during the aggregate creation? Any help would be appreciated.

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

pedro_rocha — Tue, 14 Sep 2021 14:27:59 GMT

what's your ONTAP version?

how many node on your cluster?

all the aggregates are on the same node/HA-pair?

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

ChristopherMCO — Tue, 14 Sep 2021 15:08:49 GMT

We're still on OC for this particular cluster, it has 6 nodes, and the aggregates are all on different nodes.

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

pedro_rocha — Tue, 14 Sep 2021 15:45:58 GMT

Is this iscsi or fc? Did you check slm?

Sent from my iPhone

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

ChristopherMCO — Tue, 14 Sep 2021 18:28:55 GMT

It is ISCSI.

When I check slm, the rest of the luns are reported from the same 2 nodes, but the new ones I create off this 3rd aggregate is reported from nodes different from the rest.

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

pedro_rocha — Tue, 14 Sep 2021 18:37:37 GMT

so first I guess you got it right?

probably your server has iscsi sessions to the nodes where the "working" LUNs are

you must:

1 - modify SLM, or

2 - create new sessions to the nodes where the third aggr is

regarding the SLM config difference... it is a good question. I believe you created all the LUNs in the same way, same params, right (either via SysMgr or CLI)?

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

Ontapforrum — Wed, 15 Sep 2021 08:39:57 GMT

As already suggested...

Curious as you mentioned "6" Node cluster, that suggests we have 3-HA Pairs. By default, only paths from the host to the Node containing the storage virtual machine (SVM) where the LUN was created, and paths to the HA partner of that node, are visible to the host. Could the "2 aggr" where LUNs are visible to Host are from same HA Pair, whereas the 3rd aggr is on a different Node (HA-PAIR) and does not have LIF on that Node ? Could you create 'iSCSI LIF' on the 3rd Node (HA-Pair) and try discover this 'LIF/IP as target' from Windows Host ?

Re: LUN presented from one aggregate not showing on a Windows Server 2019 host.

ChristopherMCO — Wed, 15 Sep 2021 11:24:02 GMT

Thank you both! After racking my brains for the last 2 days, I decided to take a small outage (it's a UAT server I was working with), and removed all the targets for all 6 nodes from the host server and re-added them. Apparently, it must have been sitting there in a "false connected" state. After reconnecting all the targets, the newly created luns showed up.