One one of our file servers I keep getting delay write failures to the OS disk array. Its built on a Raid1 array using an on-board raid card.
So far I've verified both harddisks are ok by pulling from the machine and doing full disk checks. (Obviously not at the same time) The write failures still happen with only one disk present and will not complete a check disk when in the server.
How do I go about checking that it definitely is the raid card or is what is done enough to safely say it is the card? Bare in mind that a faulty card means a motherboard swap.