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Multiple Non-Initialized disks Visible on Each Cluster Node

 
john Della Pietra
Occasional Visitor

Multiple Non-Initialized disks Visible on Each Cluster Node

Hello

I am new to the MSA1000 but not to SANs as a whole.

We have a 2 node exchange cluster which accesses our MSA.

We have 3 LUNS for the cluster, but on both nodes they see 6 Drives each.

The offline node sees all 6 as not initialized and the online node sees 3 working and 3 as non-initialized.

Each node has 1 QL2340.

The MSA has 2 controllers.

There is no path software installed.

I know that the offline node should see 3 drives for the cluster as in http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=PSD_EM030521_CW01.

Thanks
John
8 REPLIES 8
Uwe Zessin
Honored Contributor

Re: Multiple Non-Initialized disks Visible on Each Cluster Node

> There is no path software installed.

You have an invalid configuration -
honestly, what do you expect?
.
john Della Pietra
Occasional Visitor

Re: Multiple Non-Initialized disks Visible on Each Cluster Node

Hello

The HP MPIO pathing software is only to be installed on servers with 2 HBAs in it, any less and it looks like it is not supported or suitqble for this task.

Thanks
John
Uwe Zessin
Honored Contributor

Re: Multiple Non-Initialized disks Visible on Each Cluster Node

> The MSA has 2 controllers.

Does the adapter have access to both controllers?

If yes, that gives you two paths, but even with a multipath solution is this an invalid configuration!

One adapter is allowed to access only one MSA controller.
.
john Della Pietra
Occasional Visitor

Re: Multiple Non-Initialized disks Visible on Each Cluster Node

Hi

The controllers are not both running active at the same time, they are in active/ passive mode.

My worry is that the passive controller will not successfully take over in the event of the active card failing, unless there is an additional HBA per server, and pathing software, but...

The HP best practice doc says....

""Attachment of single-path servers to a dual-controller MSA1000 configured with Secure Path and dual HBA servers is supported with the following operating systems:
MS Windows
Novell Netware
However if the active controller fails, single path servers lose access to data on the MSA1000.""

This seems to say that it does not matter whether you have a passive card installed, it will not failover with only one path, you have to have 2 paths, ie. 2 HBAs. Is this right??

Thanks
John
DanDelcroix
Occasional Advisor

Re: Multiple Non-Initialized disks Visible on Each Cluster Node

Hi,

As Uwe stated before, one HBA is allowed to access only one MSA controller.
You need 2 HBA's in each server, each HBA connected to one MSA controller throught isolated fabrics (one active and one passive), then install the path software.
Regards.