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VM machines shut down abnormally after upgrading VMWARE ESX 3.5 U3 in Ha environment

I have A IBM blade center with 2 lames , one san DS4700 , and 14 VM machines W2000, W3ks, Suse , Red Hat .
RecentIy I  have upgrade my VI3 standard to VI enterprise and I have implemented VM Ha and DRS weeks  .
I Upgrade my Virtual center and after i upgrade using the iso method my 2 hosts from V3.5 to V3.5u3 .  2 days after the migration , all the  VM machines of the 2 hosts shut down without event  .
I have no logs on my blade; my switch Fc . I think it could come from VM HA  which has an automatic reply when one host detect isolation problem . The host shut down the VM machines .
Do you know where i must look to verify my hypothese .
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1 Solution

Try to identify the issue:
A) Disable DRS and HA and verify what append (if issue vanish check for update on ESX)
B) Try upgrade one of that nodes and verify what append (how many vm shsutdown or restart ?)
C) If you have isolation condition probably there some that don't work well on network, check it

Hope this can help you,
Giovanni Coa  
Any news ?

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