Have any of you seen a problem with disks stopping communicating, but when the system is turned off for a while and turned back on, they work again? The initial symptoms we saw was that oracle was not working properly. Then we noticed that while df showed paritions mounted, all partitions associated with a given disk actually would give input/output errors when you would try to touch them. The 'ls' command would return nothing while the 'df' command showed tons of space used. I'm using SuSE 7.0. The hardware is HP Vectra VL. I've seen this problem with various PCs. Once the PC is turned back on again, the disks continue to work for a long time with out problems. Is this definitely hardware related, or is this a communication problem with the disk and OS? thanks for your help, Walter