  Yes, it is possible. The more likely scenario is that the drive is working fine in both slots. The SAS controller will automatically assign new drives as non-RAID, and that is likely what is happening when you put it in slot 2. If the controller does not put the drive into an array or assign it as non-RAID then the operating system will not see it. When you put the drive in slot 0 it is likely just sitting and doing nothing since that slot is part of the array. The screen that you were looking at in the RAID controller will only show drives that are in the array. You should check in the SAS topology view to see if the drive is detected. If the drive is indeed not being detected on slot 0 then the slot is likely bad. In that case you should delete the non-RAID virtual disk that the drive is being put in slot 2 and the set it as a hot spare to be pulled into the mirror.
Hello everyone, I have T300 server with 2 SAS HDD in RAID 1 configuration. I had replaced Drive 0 in May 2012 because HDD light was flashing Amber/green. Today i noticed that HDD light was amber, then i removed the drive and reseated it. soon after i got BSOD. After rebooting system is ok, but that HDD lights are not blinking.  Please see the attached image of the log by openmanage server administrator. what does this mean? "Virtual Disk 0 is degraded", and how do i fix it?[IMAGE]  Please help,
T300, 2 SAS HDD in RAID 1, need help