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New Member

Connecting UCS to IBM DS4700, FC zoning

I am trying to accomplish connecting my UCS to an older SAN that I have to migrate data off.  I currently have a UCS system that is connected to an EMC VNX using 8G FC.  The zoning for this is configured in my UCS.  All works well with the connection to the VNX and I have dual active/active paths working. What I am trying to do is connect a second SAN to my UCS system, a IBM DS4700.  This DS4700 currently has a Brocade FC Switch connected to it, which then connects to a IBM bladecenter chassis.

I configured a second VSAN for the IBM array and configured the port on my fabric interconnect with that VSAN.  I went into the IBM array and I could see the UCS WWN for my HBA, so I connected it to my UCS.  When I did this, I had an unexpected result.  My VMWare ESXi host on the UCS could see all the datastores on the IBM DS4700 BUT lost connection to all the ones on the VNX.  Also, on the IBM DS4700, all of my paths failed over to the controller that had the host connection from the UCS.  I tried to fail them back over to the other controller but they wouldn't move until I disconnected the UCS from IBM DS4700.  Once disconnected from the UCS, everything went back to normal on both sides.

Does any one have an idea on how I am setup wrong here?  The ESX host on the UCS could see the datastores on the IBM so it is somewhat correct but it caused all sorts of problems.

Thanks in advance.

  • Storage Networking
Everyone's tags (2)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Silver

Connecting UCS to IBM DS4700, FC zoning

Joe,

i don't understand why did you have to create another VSAN just for your IBM array ?  Simply connect FC ports from DS4700 to FI, make sure those ports are in the same VSAN as your VNX and then zone DS4700 to your ESX cluster and sVmotion away. ( I assume you are trying to migrate off DS4700). I think you are making it more complicated than it should be.

@dynamoxxx

@dynamoxxx
Silver

Re: Connecting UCS to IBM DS4700, FC zoning

yes, zones are created on UCS.

Ok, so you don't have enough host ports to connect Controller A and Controller B to each FI. Since you are experiencing some odd failovers i would do this than. Since this is a migration effort and will not be a permanent configuration you can try this route ..connect both controllers to just one FI:

UCS FI FABRIC A:

IBM DS4700 Controller A - Host Port 2

IBM DS4700 Controller B - Host Port 2

this will ensure that UCS servers have access to both controllers so if a LUN on DS4700 happens to failover to another controller, UCS servers can still connect to it. 

@dynamoxxx

@dynamoxxx
20 REPLIES
New Member

Connecting UCS to IBM DS4700, FC zoning

I was thinking about this more and I guess I just don't know FC enough to understand this issue. Can a storage array connect to multiple hosts on different FC zones?  Or can an array only talk to one zone at a time?  Try to figure that out first..

Thanks in advance for any help.

Connecting UCS to IBM DS4700, FC zoning

Is the FI configured in switched mode? and Is the IBM array firmware supported with UCS system you're running on?

Also what is the failover mode you have set on VNX? Failover mode 4 (AULA) or 1? Try to match failover mode across all hosts to be the same.

And also do you have different HLU for VNX datastores and IBM datastores?

On the FIs do you have different FCoE VLAN for all the VSANs you have created?

It's an interesting problem, so trying to understand in detail.

Thanks,

Rags

New Member

Connecting UCS to IBM DS4700, FC zoning

I'll see if I can answer your questions correctly:

1. Yes the FI is in switched mode.  It says "FC: Switch"

2. I have no idea if the IBM firmware I have is supported on the UCS, where do I look this up? Likely not as it is a few years old.

3. The VNX to UCS connection is active/active.  I followed instructions from this youtube to configure it:

http://youtu.be/i8Hz2tgpv_Y

4. The IBM and VNX do have LUN numbers that match.  Is that an issue?  They both have something like 1-20 LUN IDs. Figured that they were on seperate VSANs?

5. I have 2 VSANs that are associated with different ports on my FI.  One vSAN is assoicated with the VNX on 2 ports, One VSAN is configured for the IBM on a different vsan number.

Thanks for the help.

Joe

Silver

Connecting UCS to IBM DS4700, FC zoning

Joe,

i don't understand why did you have to create another VSAN just for your IBM array ?  Simply connect FC ports from DS4700 to FI, make sure those ports are in the same VSAN as your VNX and then zone DS4700 to your ESX cluster and sVmotion away. ( I assume you are trying to migrate off DS4700). I think you are making it more complicated than it should be.

@dynamoxxx

@dynamoxxx
New Member

Connecting UCS to IBM DS4700, FC zoning

I don't know why I did it either. Just thought it made sense to create a second vSAN for a second physical SAN.  I will try setting it up as you suggest and see what happens.  Might have to wait a few days to test this because the last time I attempted it, the IBM SAN did a failover to the controller that I connected my UCS to.  Couldn't use the other controller until I disabled the port on the UCS that connected it to the IBM.  Odd behavior which makes me less confident to try it again during business hours.

Thanks for the advice though, I will try that and let you know.

Joe

Connecting UCS to IBM DS4700, FC zoning

As dynamox suggested just have only 1 VSAN/Fabric. Also when it comes to HLU for LUN ID it need not be different, but it's good to have a different HLU for LUNs from two different Array's for better understanding.

Also just curious to know why UCS was implemented in switched mode rather than End Host mode? Switched mode is not the recommended way!! Just curious to know.

New Member

Connecting UCS to IBM DS4700, FC zoning

I thought switched mode was used to enable FC zoning from the UCS and not a seperate device.  I'm not sure, we had some help setting it all up and that was how we did it.  I'll have to look at the settings and do some research to see what works best for us.

Thanks

Silver

Connecting UCS to IBM DS4700, FC zoning

if you have no plans of connecting UCS FI to Brocade then you you will need to do all your zoning on FI, hense switched mode.

@dynamoxxx

@dynamoxxx
New Member

Connecting UCS to IBM DS4700, FC zoning

SO, I used the same VSAN to connect the UCS to the IBM and it worked.  The caveat is that the LUNs on the IBM that have a path to controller B (host port 1 on controller b of the IBM is the port that I am using to connect to the UCS) are the only ones that can see both the IBM and EMC storage from the UCS.  To fix the issue, I am planning on running a second FC connection to the IBM from the UCS, this one will plug into the A side of the IBM and should allow all LUNs to be available to the UCS.  Didn't reliaze that the UCS wouldn't be able to see all the LUNs running on controller A unless I was plugged in on that controller as well.  Does this make sense to you as well?

Thanks for the help.

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