PowerVault ME4: Unable to add a new host to an existing host group.
Summary: Prior to GT280R006-01, Using the GUI wizard a user would be able to add a new host to an existing host group but the new host would not acquire volume mappings of the group. This is a GUI bug and is fixed in GT280R006-01. The fix would not allow a host to be added to the host group prior to performing mappings that are consistent with the group. GT280R006-01 if a user is unable to add a new host to a host group then it is because the new host is not mapped to the same "volume, lun number and port numbers" as the host group. ...
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This article is not tied to any specific product.
Not all product versions are identified in this article.
Symptoms
Simulation steps for reference (prior to GT280R006-01):
* Created a host group with one host in it and map volume/s (LUNs) to the host group.
* Created a host group with one host in it and map volume/s (LUNs) to the host group.
* Add 2nd host to the host group using host setup wizard.
*Multiple disk rescans on the newly added host will not show the mapped LUN’s. Found the following in the WBI.
*Removing ‘host1’ from the host group and adding via right click > add to host group, receive the following error. Same in CLI.
Suspect a problem with the wizard not validating the host add to an existing group with mappings.
A few other things we ran into:
* Mapping a host to a host group mapped with volume groups, the wizard displays no volumes.
Cause
The ME4 is designed to allow a new host to a host group only if the new host is mapped with the same volume, lun numbers, and port numbers of the other host members of the host group.
This is not a bug.
This is not a bug.
Resolution
Follow the below steps manually to successfully add a new host to an existing host group, do not use the wizard :
Can be done either via GUI or CLI :
1. Create initiator. Name the initiator. Repeat this step until all initiators are created for the new host.
From GUI - select hosts > Action > create initiators. From CLI - use the command "create host initiators intiators_IDs hostname"
2. Add these initiators to the host. Name the host.
From GUI - Select the initiators and click "Add to host" from the Action menu. Name the host.
From CLI - Already done in step one.
3. Map the volume/volumes of the host group to the new host. The mappings should be ditto same as the host group including the lun numbers and the port numbers.
From GUI - select "mappings" > Action > Map in GUI
From CLI - use the command - map volume volume_name1 initiator initiator_nicknames ports 0,1,etc lun lun_number
4. Add host to host group.
From GUI - Select the host > action > add to host group. Select the host group from drop-down and click OK.
From CLI - use the command - "add host-group-members hosts host_name hostgroup_name_to-add-to"
Additional Information
NA
Videos
NA
Affected Products
Dell EMC PowerVault ME4012, Dell EMC PowerVault ME4024, Dell EMC PowerVault ME4084Article Properties
Article Number: 000064997
Article Type: Solution
Last Modified: 20 Dec 2022
Version: 6
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