Also using SME server 8, all updates.
1) I've received the MDADM report on Sundays - normally the item finishes within a minute - I've assumed this meant nothing was wrong and it could be considered a test.
2) However, lately, I was receiving this report and then getting a long rebuild with messages at 20, 40, 60, 80 and finished - replacing with new Western digital RE4 Enterprise drives jumpered at 1.5 gb took me back to the quick report with no rebuild.
I used Western Digitals test routine on a Windows computer after formatting the old Western Digital RE4 Enterprise drives to NTFS and found no errors, consequently 2 weeks ago I ran with 1 of the old drives as drive 2 and had only the quick report as per 1. Last week I exchanged the drive 2 again to the other old drive and had the issue this Sunday. I'm thus assuming this 1 drive which has 2 more years warranty is at fault and am going to contact Western Digital.
It would be nice to know the command line to run the routine manually that is invoked Sunday to see if switching the drive has fixed the issue, without having to wait until next Sunday.
HP Proliant ML110 G7 with 4 gigs HP ECC RAM. Dual Western Digital RE4 Enterprise drives, drives are 5 year warranted.