While creating SR on Xen Server 5.5 U2 with backend storage as MD3000i , I was getting following error message
Troubleshooting steps:
1. I unchecked MP option on host and tried again it was able to see all the lun while doing lun scan
2. I then removed the host from pool and tried enabling MP and see if that worked but while scanning the lun it was still throwing same error message
3. Reconfigure all the virtual disk on MD3000i and check all the setting. Finally we found that on one controller if we change the prefer path then I am able to create SR or else it throws error
4. I had other setup with same storage as background. I moved this host into separate pool and checked the MP functionality. With this host I also copied /etc/multipath.conf file from the host which was working . I then restarted multipath /etc/init.d/multipathd restart
This worked great on different pool
5. Finally I updated multipath.conf on all the Xenhost and restarted multipath demon
6. From the controller side I have disabled IP V6 setting on one of the controller which was enabled
Finally with above two changes all the SR had MP enabled
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