How do I rebuild broken RAID 1?

Beep Codes Cause (Depending on RAID Level)

3 seconds on, 1 second off

• RAID 0: One or more drives offline.
• RAID 1: Two drives offline.
• RAID 5: Two or more drives offline.
• RAID 6: More than two drives offline

1 second on, 1 second off

• RAID 1: A mirrored drive failed.
• RAID 5: One drive failed.
• RAID 6: One or two drives failed.

1 second on, 3 seconds off

A hot spare drive has completed the rebuild process and has been brought into the array.

Do a ghost on the first hard drive install ghost on new hard drive and replace, I can provide more details on procedure just ask

When you restored to factory setting you have reset the RAID configuration & probably lost all the data

It looks like you have two arrays here. The first one being a mirrored RAID array and has only one disk. This means that the other disk has failed in some sort. This does not mean that the drive is bad, just the RAID failed for some reason. You will need to rebuild the RAID if you want to maintain the same level of redundancy.

You can just attempt a rebuild the RAID to the same drives but if this fails you will want to replace the bad drive. In order to do this you will need to make sure you can tell which drive is which. You do not want to mirror the bad drive to the good one.

If attempting a rebuild to the existing drive does not work or is not an option (because the failed drive could really be bad), you will need to determine which physical drive needs to be replaced. You may be able to hot-swap the drive but if you can power things down, that is always safest. Once the new drive is installed, you can rebuild to it and all should be well after that.

> RAID

Rapid Array of Independent Disks

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.

Sometimes shortened to RAID 10, RAID 1+0 is a particular combination of two different RAID levels: mirroring (RAID 1) and striping (RAID 0). The appeal of RAID 1+0 is simple: mirroring gives you the highest level of availability RAID offers, with the fastest rebuild times when a disk fails; while striping - using the proper chunk size - is the basis for high-performance I/O.

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.

You don't say whether or not your os is on the RAID 5 partition. Assuming that it is (for performance reasons, this is not recommended) then you should check to see if you have the option of configuring a separate raid configuration on your raid card (e.g. do you have a card with more then one RAID channel?) If this is so, I would create a separate RAID 1 array and install the OS just on that. Then you can mount the RAID 5 array with your data intact. Once you're up and running, you can remove the old OS partition, as it's no longer needed.

I would try the hard drive on another sata controller/port to verify that the bad drive is in fact bad. If it is really bad, then no there is nothing you can do but replace the drive and recreate the array (losing all data!).

You can not 'recover' a failed RAID-0 array because there is no parity or mirror data on an extra disk like there is with the other RAID modes. This is why people recommend against using RAID-0 for important data (unless you take frequent backups): RAID-0 actually increases your likelihood of losing your data. Statistically speaking, you are multiply the failure rates of each individual drive together.