MD3000i seems to be only using 1 controller

We had some problems lately with the disk performance in our VMware cluster. Our facility is:

  • 3 of Dell R610 running ESXi 5.1
  • 2 Juniper with 3 gigabit switches VLAN (1 for management, 2 for iSCSI)
  • 1 double Dell MD3000i controller
After troubleshooting for awhile, I found that I could use SMcli to monitor the performance of the SAN. After that, the results were a little surprising as it looks like one of our controllers seems to be totally inactive. I took a screenshot of the results: (ignore the name of the storage array. It was previously used in a configuration of XenServer)
My question is, how do I get it to where the two controllers act as a pair for optimal performance. I think there must be a way to have VMware hosts to take the shortest path for each controller to get the disk, is there not?
Any help would be greatly appreciated that it was me left speechless for awhile and internet research has not received me very far.

How do you carve up your virtual disks? The MD3k series uses a single controller as the owner of a virtual disk and the other controller is only for this virtual disk failover. That is why several virtual disks running (that spread between 2 controllers) is a better choice on a virtual disk of size unique max.

Also; the MD3000i is not validated for vSphere 5.x. It's probably not the cause, but it is important to keep in mind if you plan to use it for production (in general, I would recommend not not to run production on this combo (MD3200i upgrade) or down to vSphere 4.1).

It is also important to use 2 subnets and port 0 on both controllers on a single subnet and port 1 of both controllers in the other subnet. Then, each server should have 1 NIC in each subnet.

Tags: Dell Products

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