RAID Data Recovery
Common RAID Issues
Is your RAID or Server missing partitions? The main reason why partitions go missing on a RAID is due to file system corruption.
Think of the file system like an index of a book. How the index of a book tells us where data is stored within the book, the file system does the same in hard drive recovery.
IF the file system gets corrupts, files and folders OR partitions go completely missing. Our equipment will allow us to image/clone the entire drive, then run a scan on all of the sectors and rebuild the original file system.
Please don’t attempt to repair the file system using Disk Aid, Disk Check or other file system repair tools as this will make the situation worse.
Controller failure is by far the most common issue we see. When the controller fails you will of course loose access to the data.
But this is nothing to worry about as long as efforts are not made to recover the data before bringing it in to us. 90% of cases with controller failure are recoverable.
With our RAID Data Recovery process, we remove the drives from the housing unit, image/clone each of the drives individually, then work on rebuilding the RAID by finding the correct parameters.
Please do NOT try to put the drives from your raid in a different enclosure as this will cause irreversible damage to the data.
Multiple Disk Failure
IF your RAID has failed due to multiple disks going down, please power down the system right away to prevent data loss.
It’s important to make sure to not replace the drives with new ones as this may damage the RAID configuration on the remaining drives, making the recovery even more complicated.
When we get cases with multiple disk failures, the first step we would take is to clone/image all of the drives of the RAID (including the failed drives). Once we have a good enough image of all of the drives, we will work on rebuilding the RAID and gaining access to the data. IF you have swapped drives or made attempts to repair the RAID, please let our Engineers know.
If your RAID has experience some sort of physical damage, please make sure you power down the system (safely) as soon as possible.
Once we receive the RAID, the first thing we will do is remove all of the drives and image/clone the drives individually.
If any of the drives have mechanical issues, we will make the necessary repairs, then continue with rebuilding the RAID.
Wrong Replacement Drive
If you are experiencing an issue with your RAID after replacing one of the drives with an incorrect capacity drive, please power down the system to prevent more damage.
Most RAID’s will require you to use drives of the same exact capacity. Using a drive with the wrong capacity can cause your entire system to go down.
When brining in your RAID for recovery, be sure to bring all of the original drives.
RAID Failure due to a power outage is fairly common. What fails here is usually either the controller OR electronic issues with 1 or more of the drives.
IF you’re experiencing a RAID Failure due to a power outage, please power down your RAID as soon as possible.
You want to prevent the system trying to rebuild the data incorrectly OR with the wrong amount of drives.
Common RAID Configurations
In a RAID 0 configuration, data is split up and written across all the drives in the array. When you need to access your data, all the drives work together as one.
In a RAID 0, if 1 drive fails, the system will go offline immediately. There is no redundancy.
In a RAID 1 configuration, data is mirrored across both drives. Even if one drive fails, the system will still be online and the data accessible.
IF your RAID 1 fails, chances are that one of the drives had failed a while back and went unnoticed.
In a RAID 5 configuration, data and parity are stripped evenly across all of the disks. This type of RAID provides both speed and fault tolerance.
If your RAID 5 failed, chances are that more than one drive has an issue.
In a RAID 6 configuration, data and parity are stripped evenly across all disks. A minimum of 4 disks are required in a RAID 6 and allows up to 2 disk fo fail without loosing any data.
In a RAID 6, a third drive would have to fail for the system to go offline. Please be sure to provide all of the original drives for recovery.
RAID 10 is a combination of RAID 1 and RAID 0 data storage systems. It is a configuration that combines disk mirroring as well as disk-stripping in order to protect data.
In a RAID 10, the system can withstand one drive failure from each mirrored pair of disk drives.
A Drobo device can store up to four or eight SATA hard drives inside it. Drobo devices are designed to allow easy installation and removal of a hard drive.
The BeyondRAID technology uses a combination of RAID 1 and RAID 5 for single drive redundancy.