Category Archives: Mystery

Exchange Server messages disappearence

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 Continue reading

hash functions on md RAID-6: part three

In the original configuration the RAID-6 over the 6 disks was build using two different SATA controllers. Four disks were connected to RocketRAID and the other two connected to the integrated Intel SATA.

Now, the motherboard has changed to  a new one with 6 SATA connections via the integrated controller. However, it caused that the CPU and RAM were changed as well. So from the original Continue reading