digitalgust commented on issue #8754:
URL: https://github.com/apache/cloudstack/issues/8754#issuecomment-2133802440

   Just I retry attach an unbootable ISO to a vm USING UI, then reboot vm from 
UI too, and  the vm reboot normally, retry 3times all fine.
   
   So i suspect may be the problem is cause by secondary storage, then I reopen 
log of that day,  
   ```
    2024-03-07 00:01:18,103 DEBUG [c.c.a.t.Request] 
(AgentManager-Handler-7:null) (logid:) Seq 65-5109896727205250449: Processing:  
{ Ans: , MgmtId: 522407
   74720, via: 65, Ver: v1, Flags: 10, 
[{"com.cloud.agent.api.Answer":{"result":"false","details":"com.cloud.utils.exception.CloudRuntimeException:
 Failed
    to get root directory from secondary storage URL 
[nfs://sec.csdomain/data/secondary], using NFS version [null], due to [Unable 
to mount 192.168.100.20
   :/data/secondary at /mnt/SecStorage/c4d3ac9b-62c2-347f-a328-3e9b03850a19 due 
to mount.nfs: requested NFS version or transport protocol is not supported
   ].
   Caused by: com.cloud.utils.exception.CloudRuntimeException: Unable to mount 
192.168.100.20:/data/secondary at /mnt/SecStorage/c4d3ac9b-62c2-347f-a328-3
   e9b03850a19 due to mount.nfs: requested NFS version or transport protocol is 
not supported
   
   ```
   
     I checked the logs of that day and found  number of errors. It was indeed 
because of a failure in the secondary storage. The secondary storage system may 
have been interrupted due to the upgrade of cloudstack. I don't know why I 
ignored this error at that time. It may be because when CS reports an error, 
two errors will be threw in the log. The second error does not have a detail 
error reason. I think I may have overlooked the first error message at that 
time. After I canceled the ISO mounted on the VM, the VM started normally. I 
tried several times later. If I attached the ISO, the VM could not start. If I 
detached the ISO, the VM could start normally. This made me mistakenly think 
that the problem was caused by the unbootable ISO. 
   
      Therefore, the conclusion is: the error I reported does not actually 
exist. It was caused by the failure of my secondary storage at that time, which 
led to the failure of VM startup. At that time, I did not find the real reason 
for the failure of VM startup.
   
      I 'm sorry .
     


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