Hi all, 

Few days ago Dell PowerEdge T420 started beeping.

Upon checking server's components I found that one of the physical disks is in Foreign status. 

Status Warning
Name Physical Disk 0:1:0
Device Description Disk 0 in Backplane 1 of RAID Controller in Slot 6
State Foreign
Operational State Not Applicable
Slot Number 0
Size 2794.00 GB
Block Size 512 bytes
Security Status Not Capable
Bus Protocol SAS
Media Type HDD
Hot Spare No
Remaining Rated Write Endurance Not Applicable
Failure Predicted No
Power Status Spun Up
Progress Not Applicable
Used RAID Disk Space 0.00 GB
Available RAID Disk Space 2794.00 GB

As the result the RAID-10 virtual disk is degaded state now. 

Status Warning
Name Virtual Disk 0
Device Description Virtual Disk 0 on RAID Controller in Slot 6
State Degraded
Layout RAID-10
Size 5588.00 GB
Span Count 2
Block Size 512 bytes
Bus Protocol SAS
Media Type HDD
Operational State Not Applicable
Read Policy Adaptive Read Ahead

It is not a replacement disk. 

Could you please advise what to do with that "foreign" disk.

Should it be replaced?