What is RAID Data Recovery:
RAID recovery is the process of data recovery from a RAID (redundant array of independent disks) that fails due to a controller issue, member hard drive failure or any other problem. RAID recovery cut down to reconstruction of RAID parameters and consecutive data recovery.
Usually file recovery tools recover data from broken or corrupted file systems, but RAID data recovery or Server data recovery is completely different from normal data recovery as this system tries to find Raid configuration parameters. RAID Data Recovery can reconstruct a failed RAID and recovers RAID parameters from multiple hard drives which work together.
Why Do You Need RAID Data Recovery:
There are multiple RAID failures, but the most extreme of them is RAID controller card with visible burnt components which can’t be replaced in any way. In other cases, it may be the RAID controller that detects double hard drives failure in a RAID5 and declines to lead the array online. But in case there is no RAID, you don’t need RAID recovery and it is surprising that it is not necessary for a RAID1(mirror) as the mirroe itself carries 2 identical copies of the data. So you can put the hard drives into the active system and the data is easily accessible, but RAID recovery is not mandatory or even needed for a RAID1(mirror).
Reasons behind Raid System Falure:
- RAID Controller failure
- Multiple drive failure
- Accidental replacement of media components
- Accidental reformatting of drives or whole RAID array
- Array configuration lost
- Intermittent drive failure resulting in RAID degradation
Most Common RAID 5 failure Causes:
RAID 5 arrays are the most commonly used in a data warehouse solution where the number of READ requests is mainly higher than WRITE requests.
These are the common reasons for RAID5 Failure:
- Hardware Issue: i) Multiple hard drives failure ii) RAID Controller failure iii) RAID Controller battery failure
- Natural Issues: i) Unnatural Power interruption ii) too much of heat iii) any kind of natural disaster (fire, lightening or flood)
- Human Generated Errors: i) Controller configuration reset ii) RAID initialization iii) Volume deletion iv) Reformatting v) Wrong disk replacement vi) RAID rebuild with different configuration vii) Rebuild process interruption viii) Configuration import to incompatible firmware
There are many circumstances that your RAID controller may fail and it is quite impossible to recreate or restore arrays. For this, you have number of disk drives that contains huge data which is beyond your access.
What You Need to Consider before Starting RAID Recovery:
- If one of the associated drive of RAID 5, RAID 6, RAID 5E or RAID 0+1 is physically affected or damaged or if you have noticed repeated spin-up and spin-down noises, never use that disk for data recovery.
- If you have a hardware RAID, you must clearly label the associated disk drives, the cables, and the controller ports, so that you can easily reassemble the setup as required.
- Unplug the array member disks from the RAID controller and then attach them as individual/standalone disks to a non-RAID controller as the RAID Recovery tool requires access to the disks individually to reconstruct the RAID parameters.
- Once the RAID parameters are restored you need to prepare a free disk drive space which is equal to the volume of hard drive data which you are trying to recover.
Steps to Recover Your RAID:
- Download the free RAID recovery tool and install. After installing the tool you need to launch ReclaiMe Free RAID Recovery software.
- If it is required then you can create disk image flies of the associated disk clicking the “DISK” button.
- Once it’s done, decide the type of array:
- For “RAID 0 recovery” choose a minimum of two devices from the list and click on “Start RAID 0”.
- For “RAID 5 recovery”, you have to select all the available associated disk drives and click on “Start RAID 5”. In that case you need at least two disks. This free tool itself can recover “RAID 5” with one disk missing.
- For RAID 0+1, 1+0, RAID 5E or RAID 6, you must select all the available associated disk drives and choose the appropriate RAID type under “Other RAIDs”.
- You have to wait until the program finishes detecting the parameters which usually takes a few minutes to several hours. This process finishes when the scan progress is completely filled. Here’s when the Scan progress always increases while Confidence may decrease.
- Once all the parameters have been reconstructed, then you have to select:
- Run the tool to recover your data. If the RAID hard drive data recovery tool has been already installed on your system, it will launched in RAID recovery mode and shows the partitions on the array.
- After the previous process is done, you have to save the recovered array parameters in to a XML file.