In actual this an entry level DAS storage (In Dell, End of Life).  1st of all shutdown your server and then storage.  after complete shutdown just wait for 5 mints and turn on Storage 1st after storage booted turn on server.   If same problem need upgrade all necessary BIOS & Firmwares & Drives of server & storage. and repeat again same process.   If still same problem change the slot of the card or change the RAID controller card. I hope your problem will solve. Regards Asim
I had one failed hard drive in our powervault  system, i replaced it and it rebuilt successful. once i rebooted the server we started experiencing other problems with it. The drive that shows in my computer that is located on the powervault drives gives me the basic windows delayed writed failed error and the error "the request could not be performed because of an I/o device error". the system pretty much starts to become extremely slow and not responsive. the local drives are all working fine. once i receive the errors i can see the drives, the folders and files within them but if i try to move them or access them in any way, the system pretty much freezes. when i check Server Administrator, i see an error for Storage and then the PERC 4e/DC. when i click that all are the green check mark except for Connector 1 (RAID). when i click on that i see an error for the following: Enclosure (PV220S / PV221S), then once i click that i see errors for the following: EMMs, Fans, Power Supplies, and Temperatures.    everything seems to be running when i look at the powervault, its also not showing any amber lights on the front of it. When i check physical disks, all are online and none of them have a predicted failure.  any ideas on what the problem may be or what can be done to help fix it? thanks for any help... [IMAGE]
powervault PV220S - errors and inaccessible drives