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Changing CoreXL value for Virtual firewall

We have a R77.30 VSX / VSLS cluster with 4 physical nodes. One of the initial virtual system that we created is still on default of 1 core, in the CoreXL settings in the smartconsole. We need to change this value to 4.

Similar change on other virtual systems has caused a downtime of about a minute and I understand this is by design. Any trick to avoid this downtime? Is this behavior same in R80.10?

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I'm afraid no, you cannot avoid downtime in order to change number of cores per VS. It's a fairly complicated re-calculation of connection tables etc. One thing you could do is temporarily allow TCP connections out of state - that would allow keeping "long" running TCP sessions. That's under Global properties

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