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ESX host keep on disconnecting from VC

16 January 2009

I had a problem where randomly mu hosts would disconnect from the VC.  This was really worrying as DRS and HA would try and kick in a move all the guests to another host but then all of a sudden the host would reconnect.

After I had recovered from my heart attach I discovered that the service console was low on memory.  To find this out log on the host and type ‘free’.  This should tell you how much memory is used.  Look out for ‘swap’ and then ‘used’.  If your used swap figure is similar to your total then you need to make a change.  I’ve been told that 80mb is fine and a guide line but if it reports considerably higher then you need to change it.

Log in the client and click the configuration tab of the affected server.  Then from the left select ‘Memory’.  You should then see the service console memory allocation which could be “272MB’ which is the default.  I have upped mine to 800mb which I believe is the maximum (ESX3.5).  Click on ‘Properties’ on the top right and update appropriately.  Once you have done this you need to reboot your host.

I hope this helps!

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