No Packet Drops with XenMotion

I was trying to find out if there are packets drop during the Xenmotion. Surprises there were note even single drop of packet .Within this example Xenmotion took little extra time due to setup , as management interface is running on one NIC and recommendation is to have two nic bonded with ether channeling .
NOTE : Please remember this post is not to compare any other product but to highlight Xenmotion capabilities.

XenCenter console showing all the NIC as disconnected on XenServer

XenCenter console was showing all the NIC as disconnected, though it was connected at the backend

This is because XAPI which is responsible for communicating from XenCenter to XenServer is in hung state. Restart this service from Service console . You can also try "xe-toolstack-restart"

This will correct the GUI status

Error with XenServer: SR backend failed to complete the operation

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

XenServer: If UI seems stuck or invalid state

The XS API agent/service can be restarted without affecting VMs that are running. This service may need to be restarted after having manually configured host parameters i.e. Management NIC, etc.

•XS Agent runs on top Xen Hypervisor API and XenStore

#service xapi restart

While adding host in XS pool : The hosts in this pool are not homegeneous

I was getting following error while joining XS to the Pool

Went to XECONSOLE and then selected following and it will give you warning

Then it will ask you for pool master IP and root credential . Once supplied it will ask to confirm , F8 to confirm

This will give successful message . Host will appear in correct pool