When attempting to install XenServer hotfix the following error message is displayed:




Note that there are no ISO's attached to any of the VM's running in the pool. Also executed the 'xe vm-cd-eject --multiple' command to ensure this is the case:

xe vm-cd-eject --multiple operation failed on 175dba47-ed62-9810-dba7-1d3447fb1860:
 

Operation could not be performed because the drive is empty vbd

1) Find out out all the VDI which are related to tools ISO

#xe vdi-list  | grep -B2 tools

Except the vdi which has name-label xs-tools.iso, no other VDI should have Virtual block devices attached to it.

2) To figure out that run the following command against each VDI

#xe vdi-list uuid=<UUID from step1> params=vbd-uuids

If any of the above except vdi with name-label xs-tools.iso return a VBD, we need to remove that object which holds that VBD

#xe vbd-list uuid=<UUID from step2> params=all

This will tell you which one is holding the VBD. In one case, it was a snapshot, which was destroyed using

#xe snapshot-destroy= UUID

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Problem Cause

One of the snapshots (disk+memory) was holding old xentools as attached in XAPI DB.