Raid Degraded

I received an this critical error message (attached) on my server.  I am assuming there is an issue with a disk on the server. Can anyone explain in more detail, and/or provide a solution?

Thank you
TonyMannellaBusiness/IT AnalystAsked:
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PowerEdgeTechIT ConsultantCommented:
Server model? RAID controller? Number of disks? RAID level? OS?
RAID degraded means one disk from a RAID group was kicked out.  Look at the server , and if it is hot swap, you will see a Drive that has an Amber light or has a red light depending on Server make/model.

Depending on how new the server is. First thing is you need to have a replacement of the same size or larger(space used will be limited to the size of the current drive)

Step two depending on your server make model, you would either simply pull the failed drive and replace it with the new one. Or you would need to use the Server management tool to indicate that you are removing the failed drive, and then just insert the new one.  The rebuild will start shortly after the new drive is recognized, assigned, etc.

The above deals with hardware raid controllers, if your setup is using software raid (OS based disk management)
Server make model, OS, and output of the disk/RAid Setup info is needed to understand what your setup is.

In short, more detail is needed on what steps you've already taken: i.e. did you already identify the issue?

Depending on your setup, time might not be on your side.  The drives are likely of the same age and one having failed, another might follow suit shortly which will make things significantly worse.
Besides replacing the bad disk with a new one certified by your Server manufacturer, it is also a good idea to make sure your backups are OK, or make an extra one before replacing the disk. Rebuilds can sometimes fail, or a further disk fail before the rebuild has finished. This is particularly risky if you are still using RAID 5 and your disks are large, as then the rebuild can take very long.

A further good idea to get an extra spare disk, and if your server has empty disk bays, insert that disk into such a bay and use your RAID utility to assign it as a hot spare. That way, if a disk fails in the future, the spare will take over immediately and get replicated to. This means that your system in degraded mode for a shorter period reducing your risk. This doesn't mean that you shouldn't keep on monitoring your RAID arrays for future problems.

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PowerEdgeTechIT ConsultantCommented:
I would recommend you provide a LOT more details when you ask questions. Any answer to your question as it was asked without more details is purely hypothetical and generic.
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