Migrating hosts from RHEL6 to RHEL7

20 Aug 2015

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Has anyone succeeded in upgrading their hosts OS version from 6 to 7?  I as=
sumed it could be done without downtime and one host at a time, but when tr=
ying it out I found that RHEL7 hosts can't be placed in the same Cluster as=
 RHEL6 ones.
I then tried making a new Cluster and migrating VMs from the RHEL6 cluster =
to RHEL7.  Initial testing seems to show that it works from RHEL6 to RHEL7 =
but not the other way around.  Also when I select this option a warning pop=
s up saying "Choosing different cluster may lead to unexpected results.  Pl=
ease consult documentation."

I looked in the Admin Guide and Technical Reference Guide but don't see whe=
re these unexpected results are mentioned.

Thanks,
Ryan Groten

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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif"">Has anyone succeeded in upgradin=
g their hosts OS version from 6 to 7?  I assumed it could be done with=
out downtime and one host at a time, but when trying it out I
 found that RHEL7 hosts can’t be placed in the same Cluster as RHEL6 =
ones.  <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif"">I then tried making a new Cluste=
r and migrating VMs from the RHEL6 cluster to RHEL7.  Initial testing =
seems to show that it works from RHEL6 to RHEL7 but not the other
 way around.  Also when I select this option a warning pops up saying =
“Choosing different cluster may lead to unexpected results.  Ple=
ase consult documentation.”<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif""><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif"">I looked in the Admin Guide and =
Technical Reference Guide but don’t see where these unexpected result=
s are mentioned.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif""><o:p> </o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif"">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:"Ce=
ntury Gothic","sans-serif"">Ryan Groten</span><span style=3D=
"font-size:10.0pt;font-family:"Century Gothic","sans-serif&q=
uot;"><o:p></o:p></span></p>
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Groten, Ryan

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