Discovering new paths on Windows Server

Panther411 — Wed, 04 Jun 2025 09:45:09 GMT

Hi,

We've added an A400 system to our cluster and need its interfaces discovered on one of our Windows Production Servers. It's zoned correctly and I can see the interfaces are logged in.

Windows is not seeing the new paths, i've created a new lun and mapped it to a new Igroup with the new interfaces binded. This is a production server and rebooting is currently not an option.

It was suggested through a google search to disable and re-enable MPIO - will this cause any disruptions?

What are my other options?

Re: Discovering new paths on Windows Server

jaikumar — Sat, 09 Dec 2023 20:02:59 GMT

Disabling MPIO may not be at device level but for all the devices , which is not recommended when there is IO to the underlying Block Storage Device.
But following can be tried.
* Check if the initiator is logged in
fcp initiator show
(vserver fcp initiator show)
Logical Port Initiator Initiator
Vserver Interface Address WWNN WWPN Igroup
--------- ----------------- -------- ------------ ------------ ---------------
vserver LifFCP1 20:00:00:10:9b:57:94:ce 10:00:00:10:9b:57:94:ce igroupname
*

igroup show -igroup igroupname

Vserver Name: vserver
Igroup Name: igroupname
Protocol: mixed
OS Type: vmware
Portset Binding Igroup: -
Initiators: 10:00:00:10:9b:57:94:ce
Child Igroups: -
Initiator Comments: -
Initiator Comments: -
Igroup UUID: 3fc5b0e7-9370-11ee-b474-00a098f3e343
ALUA: true
Initiators: 10:00:00:10:9b:57:94:ce (logged in) << Check if the host initiator is logged in
Vserver UUID: 065f43a9-7ee7-11ee-86d3-00a098f3e357
Delete on Last Unmap: -
New Name: -
Igroup Comment: -
Child Names: -
Parent Names: -
Replication Peer: -
Replication Error: -
Replication Error Igroup: -
Peer Vserver UUID: -
Peer Igroup UUID: -
Replicated Igroup Contains Unreplicated LUNs: false

* And if the initiator is logged in then , Rescan for new Disks in the Windows Disk Management

topic Discovering new paths on Windows Server in Network and Storage Protocols

Discovering new paths on Windows Server

Re: Discovering new paths on Windows Server