Another story from the mystery category. A Microsoft Small Business Server has been moved from one premises to another twice in the last two weeks. The first time the server was moved and the users confirmed that the server is up and running and all the services working fine. The main service of the server is Microsoft Exchange.
Two days later the user report they can not connect to the server. The server hanged. No response to the keyboard or the mouse. It had to be powered off and cold reboot. After reboot everything seems to be running smooth and everybody is happy.
After the next move the server boot up and everything seems to be OK. New e-mails are coming and going. However, all the e-mails since the day of the last move are gone. They are gone for all the users. Users are in panic. Admins have no idea what is going on. The Exchange Management console can not find any messages for the last 12 days.
The cause of the problem was the degraded RAID-1.
When the server was relocated the first time it seems that the first disk connection got loose. The server had booted then hanged. No alarm were issued by the disk controller.
After reboot the server started from the second disk and worked fine until the second relocation. After the relocation the server booted from the first disk and all data since the last relocation was not available.
As a solution the first disk was disconnected and the server was boted from the second disk. The data was there. Then the first disk was connected and synchronized with the second disk.