This has happened twice now. 4 Drives, which I routinely swap out, have to be deleted, and the server's resources updated. The new drives are "green". And then, sometime during the week, the new drives disappear from SAM, and the deleted drives are back , and of course, red. The new drives are no longer listed. The only evidence of the change is under events log, which shows when the old drives were deleted. Either I am doing something wrong, or there is some other monitoring problem. Of course, since this procedure had been working for months, there must be something else here.