Solved

"Virtual Disk not on preferred path due to AVT/RDAC failover" on MD3000i Storage Array

Posted on 2013-06-11
7
4,460 Views
Last Modified: 2016-11-23
We had our MD3000i connected to an ESXi 4.1 host, which was exclusively used by a VM on it which was our file server.  After a recent reboot, this file server went loopy, so we have to rebuild it!

I rebuilt it on another ESXi 5.0 host and at first it looked to work ok and on the face of it, it is working ok, but the Modular Disk Storage Manager is saying that Array is non optimal.

Further investigation shows that the virtual disks configured with preferred controller 1 are all residing on controller 0!  If I manually change them back to 1, they change back to 0.

Nothing suggests a hardware fault at this stage, but in the error logs it refers to a AVT/RDAC failover.  The full error states:

Date/Time: 11/06/13 14:41:50
Sequence number: 10818
Event type: 4011
Description: Virtual Disk not on preferred path due to AVT/RDAC failover
Event specific codes: 0/0/0
Event category: Error
Component type: RAID Controller Module
Component location: RAID Controller Module in slot 0
Logged by: RAID Controller Module in slot 0

I would call Dell, but our support has just ran out and I'm cant rely on the company renewing it in a hurry, so any tips would be appreciated.
0
Comment
Question by:FSIFM
  • 5
7 Comments
 
LVL 12

Expert Comment

by:Seaton007
ID: 39239304
There should be an option to balance them or fail them back over to the other path.

Here is something else to check as well:
http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1009414
0
 
LVL 4

Author Comment

by:FSIFM
ID: 39239315
There is an option to 'Redistribute Virtual Disks', but that just puts the disks on their preferred path, which I've already done manually.

Is it possible that an ISCSI Initiator Config issue could be the culprit?
0
 
LVL 119
ID: 39239420
do you have multiple paths, and are you using any additional software supplied by Dell for path mangement?
0
The Eight Noble Truths of Backup and Recovery

How can IT departments tackle the challenges of a Big Data world? This white paper provides a roadmap to success and helps companies ensure that all their data is safe and secure, no matter if it resides on-premise with physical or virtual machines or in the cloud.

 
LVL 4

Author Comment

by:FSIFM
ID: 39239508
Dells multi path driver has been installed as part of the Management software, but I'm not sure that the ISCSI Initiator is configured appropriately to take advantage of it.

I can ping all 4 of the Controller IP addresses from the host.  If I disable the NIC connected to controller 1 (that one that one take any virtual disks, its still pings them all.  However, disabling the NIC linked to controller 0 causing the shares to fall over.

I've attached the target tab of the ISCSI initiator as its not saving the Enable Multi Path option.
SnipImage.JPG
0
 
LVL 4

Author Comment

by:FSIFM
ID: 39239531
Just to clarify, the MD 3000i isn't presenting storage to the ESXI hosts as Data Stores.  Instead, its configured with virtual switches, that are assigned as additional NICs to the file server, which in turn uses the Microsoft ISCSI initiator to gain access to the assigned virtual disks.
0
 
LVL 4

Accepted Solution

by:
FSIFM earned 0 total points
ID: 39244984
Fixed the issue myself in the end.  It was an iSCSI initiator issue.

Essentially, configure the Favourite Targets from the Targets tab.

Steps taken where:

1.  In Targets tab, click the Connect button
2.  Tick the 'Enable multi-path' check box
3.  Click Advanced button and change the Defaults to
3.1 -  Local Adapter = Microsoft iSCSI Initiator
3.2 -  Initiator IP = First iSCSI connected NIC on the server
3.3 -  Target portal IP = Corresponding IP address of the controller matching the Initiators Subnet
4.  Click OK
5.  Repeat Steps 1 to 4 until you have assigned an Initiator IP to all available targets on the iSCSI array.

6.  For me, I then went into the Favourite Targets tab and deleted any that didn't match the details entered above.
0
 
LVL 4

Author Closing Comment

by:FSIFM
ID: 39255602
I found the solution myself.... Ok, I got assistance from a Dell Technician, but don't tell anyone.
0

Featured Post

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Finding original email is quite difficult due to their duplicates. From this article, you will come to know why multiple duplicates of same emails appear and how to delete duplicate emails from Outlook securely and instantly while vital emails remai…
In this article we will learn how to backup a VMware farm using Nakivo Backup & Replication. In this tutorial we will install the software on a Windows 2012 R2 Server.
Teach the user how to install and configure the vCenter Orchestrator virtual appliance Open vSphere Web Client: Deploy vCenter Orchestrator virtual appliance OVA file: Verify vCenter Orchestrator virtual appliance boots successfully: Connect to the …
Teach the user how to use create log bundles for vCenter Server or ESXi hosts Open vSphere Web Client: Generate vCenter Server and ESXi host log bundle:  Open vCenter Server Appliance Web Management interface and generate log bundle: Open vCenter Se…

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question