https://community.hpe.com/t5/operating-system-vmware/esx-connection-with-eva6000/m-p/4593844#M640 The EVA and switch firmware have gone out of support quite some time ago. ESX 4 was certainly not tested against that old versions so it could be anything.<BR /><BR />A hardware problem or a software problem that comes up after some time or in specific situations (e.g. there was a problem in the controller firmware many years back that caused a failure when a SCSI reseration collided with a very large I/O).<BR /><BR />It is hard to give advice without access to the system. I would start by checking the FC port counters and the VMkernel logs.<BR />And look if something 'unusual' (e.g. backups, VM imports, ...) are going on on the system when the errors happen. Wed, 03 Mar 2010 09:43:02 GMT Uwe Zessin 2010-03-03T09:43:02Z https://community.hpe.com/t5/operating-system-vmware/esx-connection-with-eva6000/m-p/4593843#M639 Dear.<BR /><BR />I have one Blade enclosure C3000,with 3 Blades BL460C G5,connected to EVA6000.<BR />On the blades server ESX4.0 is installed which provide the multipathing,and the vmware partition are windows.<BR />One LUN on the EVA is created and presented to the 3 hosts blade and the ESX is providing the Multipathing.<BR /><BR />everything works fine,until one day the 2 paths to the EVA are lost within the ESX ,then the 2 left are lost ,connection lost to vsphere LUN and then by itself the communication is restored and so on ,this Scenario happens 3 to 5 times per Day.<BR /><BR />The EVA firmware is 5,1 and it is EVA6000 and the SAN switches had the firmware 50.1b ,we are supecting a compatibility problem between the ESX and ESX multipathing and the EVA and or San Switches.<BR /><BR />Please anyone have an idea.<BR />HELP and thanks in advance <BR />BR Wed, 03 Mar 2010 09:01:10 GMT https://community.hpe.com/t5/operating-system-vmware/esx-connection-with-eva6000/m-p/4593843#M639 Safir Safir 2010-03-03T09:01:10Z https://community.hpe.com/t5/operating-system-vmware/esx-connection-with-eva6000/m-p/4593844#M640 The EVA and switch firmware have gone out of support quite some time ago. ESX 4 was certainly not tested against that old versions so it could be anything.<BR /><BR />A hardware problem or a software problem that comes up after some time or in specific situations (e.g. there was a problem in the controller firmware many years back that caused a failure when a SCSI reseration collided with a very large I/O).<BR /><BR />It is hard to give advice without access to the system. I would start by checking the FC port counters and the VMkernel logs.<BR />And look if something 'unusual' (e.g. backups, VM imports, ...) are going on on the system when the errors happen. Wed, 03 Mar 2010 09:43:02 GMT https://community.hpe.com/t5/operating-system-vmware/esx-connection-with-eva6000/m-p/4593844#M640 Uwe Zessin 2010-03-03T09:43:02Z