Trouble with FC SANs

I have an older IBM X 366 server that we have attached to an IBM DS4700 FC SANs.  The server has two Qlogic HBAs.

I have accessed the SAN using the IBM storage manager and I have created an array and  single LUN set to be used with Windows and initialized the "disk". I have created a group and mapped the array to the server.  The SM software sees the HBA WWNs OK.  When I boot the server initially it saw the disk as two disks; one that I could initialize and one that I could not that were the same size.  I did some research and added the MPIO feature to the server.  Now when I see the disk I only see one, but I cannot initialize it.  I get an Incorrect Function error message. I played around with the MPIO settings and found what when I changed it from Round Robin to Failover I could then initialize the disk and it gets assigned a drive letter and is formatted.  However, if I change it back to round robin it becomes uninitialized again. Even when I set it back to failover it stays that way.  If I reboot and then set it to failover, I can again set it up.. However, if I then reboot again, not doing anything else to the disk, it goes back to an uninitialized state and once again I cannot set it up.

Any thoughts?  Thanx...
LVL 28
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Do you have the DS4700 DSM for MPIO installed? that's what tells MPIO how to deal with specific SAN attached devices. From it looks like it is included in the storage manager zip file.

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
hi mate,

it's a typical symptom of not having correct MPIO driver installed in the Windows 2003/2008 system or/and to have problem with permissions access to one of storage paths (so problems with zoning or paths connection) and eventually access different paths by different HBA cards (not same vendor).

so check:
- if You have MS MPIO driver installed
- if you have also IBM DSM installed (its a pack of files with MPIO drivers) and this should be installed with or after installing MS MPIO drivers in win 2k8
- check your zoning and permission this host to the SAN and LUN (so check in on the FC switch and on the Storage Manager)
- check connection to all paths
- check eventual firmware of FC HBAs on a host, they also should be a same HBA, not other vendors HBA (like 1 is QLogic and second is Emulex) - I know that last one is not a problem here but write it to others to share knowledge

You can read also more about MPIO with IBM Midrange System Storage Hardware Guide here:

then it should work ok.

best regards
jhyieslaAuthor Commented:
Thanx to both of you for this info.  I think I have whatever DSM MS has with Server2008R2.  I'll check out the link

I'll also check the FW levels and recheck the logical connections; I'm pretty sure about the physical connections. This will have to wait until I am back in the office on Monday.
jhyieslaAuthor Commented:
Thanx, that did it.  I found the update in the SM install files and did that and most if it cured right up. I then did the FW upgrade as well and as far as I can tell it's working well.
Dawid FusekVirtualization Expert, Sr B&R, Storage SpecialistCommented:
good mate we can help with that.

It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Server Hardware

From novice to tech pro — start learning today.