[VM migration script when Xenserver goes down]

You might be able to achieve the same using the below command 

xe host-declare-dead uuid=host_uuid

https://docs.xenserver.com/en-us/xenserver/8/command-line-interface.html#host-declare-dead

This call is dangerous and can cause data loss if the host is not actually dead.

You may want to test it on a Test XS pool to ensure it meets your requirements.

[Best Practice for Optimizing Live Migration in CVAD Environment]

Hello Ross,

• Can you give an approximate time difference and the RAM size of the VMs at both places for Live Migration/vMotion ? 
• With our new XenServer 8  (not CH 8.2Cu1) we have a new compress and migrate option that might benefit you : https://docs.xenserver.com/en-us/xenserver/8/vms/migrate.html#live-migration 

If you have tested XenServer 8 and if you are still seeing the problem as highly concerning , would you be able to log that as a support ticket ? 

Regards

Boby

[XenServer Update failed with error "Syncing with remote YUM repository failed"]

Was this a host that was getting updates earlier and failed recently ?

Can you attach /var/log/xensource.log from your host here ? ( Assuming there is no proxy )

 

[XenServer 8 LTSR Updates]

Hello Eric,

Supplemental packs (including driver disks) are used to modify and extend the functionality of the XenServer host, by installing software into the control domain (dom0) , this is different from host updates. Currently, Internet access is a necessity for XenServer 8 updates. Rfer : https://docs.xenserver.com/en-us/xenserver/8/update/apply-updates-using-xc 

 

To provide update notifications, XenCenter requires internet access. If your XenCenter is behind a firewall, ensure that it has access to the updates.ops.xenserver.com domain. 

To receive the updates, your XenServer hosts require internet access. If your hosts are behind a firewall, ensure that they have access to subdomains of ops.xenserver.com.

However you should be able to use a proxy server and apply the updates. Refer : https://docs.xenserver.com/en-us/xenserver/8/update/apply-updates-using-xc#configure-updates-for-your-pool
 

(Optional) Under Proxy Server, specify a proxy to use when synchronizing with the update channel. This proxy server is used for communication between the host and the public CDN.

 

[Delete Virtual Xe Recovery File System]

Can you ensure that none of your VMs are actively using it ?

Can you try to run the following on all the hosts in the pool and see if you are getting an output ? 

tap-ctl list | grep -i 8e18c874

[Cannot Connect to XenServer from XenCenter]

 @Steven Schoch Do you believe you can log this as a ticket at https://bugs.xenserver.com/ ?