So that isn't a real failure or issue. Whenever volumes are connected or disconnected to a host on the array, the array will issue a Unit Attention (UA). What does the unit attention do? Short answer it let's the host/init know that there has been a change to the scsi devices connected to the host and that it should refresh/update the device listings.
This means that you don't need to rescan from the host every time a volume is connected or disconnected from the host in order to get the scsi device list to update. This is very important for vvols as many volume connect and disconnect operations are going to happen and we don't want the host to have to manually rescan storage each time.
