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If Raid is broken then logical drive will fail & will result in data loss.
enter into Smart Array Controller bios by pressing F8 & Recreate Raid 1 by selecting two working drives.
You should first look at the drives on the front of the server to see if there are any failure lights.
If not, then it may be a RAID battery that is indicating failure.
Either way, this is probably an LSI RAID controller. Even after you correct the issue, you may still have to use the RAID utility (megacli in Linux) to silence the alert.
LSI is quite inefficient about their RAID controller and how they handle the issues.
The manufacturer of the RAID interface-card has software that can be installed to monitor the RAID, and to identify any "failed" disks, and to "rebuild" the RAID array after a new disk-drive has been added to the array.
RAID logically combines several identical disk-drives for better performance or for better reliability.
For better performance, one RAID configuration "stripes" the data, i.e., when you write a block of data, the block is split into "stripes", and each stripe is written to a different disk-drive.
Since each stripe is smaller than the whole block, it is faster to transfer the data in "parallel".
For better reliability, another RAID configuration writes each block of data _identically_ to multiple disk-drives. Thus, if one disk-drive fails, your data still exists on the other disk-drives.
You can then replace the "bad" disk in the array, and use software to "rebuild" this "mirroring" of your data, by copying all the data from one of the "good" disks onto the "new" disk.
So, in your case, one of the disks in your array is failing. Identify it. Replace it. Rebuild your array.
Sounds like one of two errors - either one of the power supplies has died (not sure if the 1800 has redundant power supplies or not) or a drive in the RAID array has failed. Most likely it's the drive. Run the Dell Server Administrator tool to check the health status of the array, sounds like you need to replace a drive. Most RAID systems fail if you lose more than one drive, so I'd replace that drive ASAP.
Check the PowerEdge Raid Controller for parity problems. Sounds like the status on the physical volumes participating in a RAID array has been degraded.
Loud beeping from a drive is usually an indication that an invalid drive array member has resulted in a degraded logical volume.
If you were counting correctly, you had at least three drives - most likely participating in a RAID-5 setup. The array might have been rebuilt with one bad drive. But it sounds like you've got two corrupt physical volumes in the array. And that's not good.
Not a lot of details, but here is some basic information, assuming you have a Dell with Integrated RAID
Dimension 9150/9200 and XPS systems have RAID, depending on the model the exact troubleshooting differs. At boot, after the Dell screen, you should get the RAID status listing. RAID 0 will either be normal or failed. Raid 1 can be normal, degraded for failed.
If the RAID array was RAID 0 and one of the drives failed, then all data is lost and you'll have to create a new array then reinstall Windows and drivers
If the RAID array was RAID 1, then you may need to add the new drive to the Array, CNTL+I or CNTL+N at boot (Depending on the system model) add the new drive to the array and reboot. If the system still will not boot to Windows, then you may have a software error too with the OS.
If during troubleshooting, the array was broken in the RAID BIOS, then the array will need to be recreated and Windows/Drivers reinstalled.
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