https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074324#M24939 You don't need to unpresent the LUNs but you must be sure that no I/O operations are done to those LUNs from the ESX server.<BR /><BR />Unpresenting the LUNs is a way to ensure that no I/O is performed. You could also remove from the zoning configuration to ensure that. Mon, 24 Sep 2007 08:23:06 GMT Ivan Ferreira 2007-09-24T08:23:06Z https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074322#M24937 I am upgrading the XCS code this week. Offline upgrade.<BR /><BR />I am shutting down the Virtual servers on this EVA but the ESX server will be online since it has other virtual servers with LUNs on other EVAs.<BR /><BR />WIll I need to unpresent the LUNs allocated from the servers I am shutting down ? on the EVA i am upgrading.<BR /><BR />Thanks Fri, 21 Sep 2007 14:44:13 GMT https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074322#M24937 Sajeev2007 2007-09-21T14:44:13Z https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074323#M24938 Hi,<BR /><BR />I wouldn't have thought so no. The ESX servers will lose their connection to the EVA for a short time whilst the controllers reboot. It shouldn't be necessary to unpresent the LUNs.<BR /><BR />Cheers,<BR /><BR />Rob Fri, 21 Sep 2007 16:10:37 GMT https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074323#M24938 Rob Leadbeater 2007-09-21T16:10:37Z https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074324#M24939 You don't need to unpresent the LUNs but you must be sure that no I/O operations are done to those LUNs from the ESX server.<BR /><BR />Unpresenting the LUNs is a way to ensure that no I/O is performed. You could also remove from the zoning configuration to ensure that. Mon, 24 Sep 2007 08:23:06 GMT https://community.hpe.com/t5/disk-enclosures/vm-ware-and-eva/m-p/4074324#M24939 Ivan Ferreira 2007-09-24T08:23:06Z