Sorry can't help yet but we discovered the exact same thing on a system we set up two days ago.  We're using SME 5 Update 2 and an Adaptec 2940U2W controller with two IBM Ultrastore 18 Gb SCSI drives using software RAID.  No negative effects have been detected but it is disconcerting.  If we find a solution before you, we'll let you know and it is hoped that you'll do the same.
Dave Ussell
ASCII 27