Can I Recover Data After a RAID Failure?
Hi Everyone,
I’ve run into a RAID failure and I’m not sure what my next steps should be.
The setup is a Dell PowerEdge server with a PERC H710 RAID controller. It has eight 4TB drives in RAID 6. After a power outage today, the server rebooted and the controller now shows the virtual disk as “failed.” In the controller menu, two drives are offline and one is in a foreign state.
I tried reseating the drives. They are detected individually, but the array still won’t come online. Importing the foreign configuration either hangs or fails. Right now, the drives are visible, but the RAID volume is inaccessible.
I don’t have a recent backup of this data, and I’m concerned that trying different recovery options could make things worse.
Has anyone dealt with something similar? Is there a way to rebuild or recover the data without risking total loss?
Thanks.
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A RAID 6 array on a Dell PERC H710 can handle up to two failed drives, but with two showing offline and one in a foreign state, the controller will not bring it online. This doesn’t always mean the data is gone. A power outage can leave the RAID metadata out of sync and confuse the controller.
Do not initialize, rebuild, or create a new virtual disk, as this can overwrite metadata. Make note of the current status of each drive and review the controller logs. In some cases, a drive marked offline can still be forced back online without a rebuild.
For a DIY approach, recovery software such as R-Studio, UFS Explorer, or ReclaiMe can often reconstruct the array if given the correct parameters. Always clone the drives before testing, so the original disks remain untouched.
If the data is critical, the safer choice is a professional RAID recovery service. Since the drives are all detected individually, recovery is possible, but it needs to be handled carefully to avoid permanent loss.