Question:
My RAID 1 Mirror Setup is Faulty and Need Help?
Rajen R
2010-02-22 05:50:41 UTC
Any ideas as to what went wrong?

I have an asus p5k motherboard with Jmicron RAID. JMB36X I think.

I have 2 SATA 500gb drives linked to the raid, in a mirror mode.

I have a 160gb disk with Windows 7 on it.

One day, when starting the computer, at the POST, there was a red notice saying the RAID was degraded.

Windows 7 loaded, and when I clicked on the D: drive (which is the raid pair), and it said it did not know the structure and that the disk needs formatting.

So I restarted the computer, and the degraded message had changed to REBUILD.

Windows 7 loaded. From my motherboard disc, I installed the RAID configuration utility. I ran this program, and the message came up saying the data needs to be re-synchronized.

I resynch'ed the data, and when it finished, it said Success.

I restarted the computer, and the POST message said "Mirror", or whatever is usually displayed under normal circumstances.

Windows 7 loaded, and I still cannot access the drive. Windows says it needs to be reformatted.

I switched off. Pulled both disks out. Used a USB connector and attached them to ANOTHER PC, one at a time. Windows still gave the "need to reformat" message and refused to read the data.

I am now using Captain Nemo to restore (or backup) the data, as it is reading it okay.

Any ideas what happened?

Surely a RAID 1 is to prevent data loss? Is it possible that if one drive is corrupt, it will mirror onto the other?
Three answers:
2010-02-22 06:55:54 UTC
Hi

the whole idea of raid 1 is just what you have here one drive has failed and needs replacing.

raid one is both disks are duplicates of each other so when one fails the data is safe but the faulty drive needs replacing NOT reformatting.

One of your drives is faulty possible head crash.

There is no other way you need to replace it otherwise you would have lost all data. if it was not in a mirroring situation you would have lost the lot.

the chances are if you don't replace it the other drive will fail shortly afterwards and then you will be in trouble.

you should have had a hot swap spare drive waiting and available to swap out when it failed.

yes it is expensive but not as expensive as loosing all that data.

If this is business and a hot swap is not available. then if you where a systems operation manager then you would be at fault and should be fired for not making sure the system was resilient.
2016-12-11 09:54:05 UTC
"examine disk for blunders" tests the logical disk. If the logical disk includes 2 actual disks, they'll the two be checked. So in case you have already created the RAID a million array, and the array is known via homestead windows 7 because you loaded the terrific suited RAID driver, then the respond is confident.
2010-02-22 07:36:40 UTC
Use a different SATA cable.

Run chkdisk



How to use CHKDSK (Check Disk)

http://www.w7forums.com/use-chkdsk-check-disk-t448.html


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