/sbin/halt from command line
We have an NS120 installed, storing production datastores for a group of ESX servers. An unfortunatle requirment has risen and I need to replace some PDUs in that RACK. My plan has been to verify the redundant power for everything in the NS120 and then disconnect and reconnect to the new PDU.  However, I have come across one particular appliance in the NS120 stack that only has a single power source. This is the appliance that has the management port connected to it as well as the DVD on the front.  I have discussed this with a few EMC folks and everyone says it would probably be ok, just give the device a graceful shutdown and that it is merely running the management environment, i.e. the webserver and all that entails.  No doubt about it, this device only has one power source. Common sense tells me this highly available storage environment is not ultimately dependant on an appliance that has only one power source. But again, I am skeptical and will not bet ungraceful downtime on common sense.  Has anyone downed this appliance while still servicing IO requests, particularly on an NS120?  I have added an image of the NS120 and circled the single power source.  Thanks, Bart  [IMAGE]
Single Power Supply on NS120