Summary: This blog post discussed about the recovery of data from RAID 5 when there is 2 Disk failure. In this section, we will attempt to answer all the related queries.
The basic questions that come to mind while configuring data storage as RAID are: Does the configuration of RAID Array provides sufficient data redundancy and is it boosting the data performance? The answer to both the queries is ‘Yes’, and failure of a single drive in an Array may not disrupt data availability. However, considering RAID 5, the situation differs in case of more than one disk failure. The question arises, how to recover data from RAID5 with 2 disk failure?, the sequence of action should be — first to recover the data available on the RAID 5, followed by RAID rebuild with the same configuration, and uploading data on the rebuilt RAID.
What are the factors that cause RAID 5 Disk 2 failure?
Failure of multiple drives’ at the same time
Re-establishing RAID 5 Array with a failed drive
No partition configured on RAID
Illogical configuration of RAID Volume
Malfunctioning of Raid Controller
Unexpected power breakdown
Virus or malicious software attack
Note: RAID Controller should not be active after 2 Disk failure, hence before starting recovery, stop performing any further actions and turn off the PC.
Raid 5- 2 Disk failure Recovery
The following options help recover data from RAID 5 after 2 Drive failure:
Professional RAID data recovery software
Steps to retrieve data from a backup:
Verify if the available backup can be restored: Restore the backup to a different location, preferably on a spare drive.
Verify the data after restore. If the data is clean and usable, proceed to the next
Repair the drives in a RAID In case the drives or disks cannot be repaired, then replace them with new disks. Replacing the drives with previously used drives may again create performance related issues. Such a situation is avoidable by testing the drives for performance and certify them for production.
Upload the data on the newly configured RAID.
Test the performance of RAID Array
The limitations of recovering data from a backup:
Restorable data may be in good condition, but the entire process may be time-taking
Fear of crucial data loss
Restored data may not be complete or in the original intact form.
Due to several drawbacks of RAID recovery from backup, a better option is to recover data with the help of a manual method or by using a professional data recovery software.
Manual method to recover data from RAID 5 with 2 Disk Failure:
Before starting with manual procedure, organize the software and the hardware. The following things should be in place:
An external storage device with an adequate amount of disk space. This device could be a storage device like a Network Attached Storage (NAS) or a Personal Computer (PC)
Ensure uninterrupted power supply. Install a UPS with the capacity to support Hard Disk dock, router, backup PC or NAS, and the computer system to perform operations
An unused PC to connect failed disks with bootable disks
Two working drives to replace the existing drive
RAID Array configuration to map the rebuilt array with the original
Note: Recovery should be performed only by Certified Professionals. Ensure that the entire recovery operation is executed in the supervision of these experts.
Steps to recover data by using the manual method:
Attach all failed disks to the bootable disk
Recover content to the recoverable storage disk
Replace the existing disk with working drives
Rebuild and configure RAID as a duplicate of the original
Transfer the entire data from the bootable disk to the newly built RAID Array
Limitations of recovering data by using the manual method
Lengthy and time taking process with no surety that the retrieved data is free from corruption
RAID Array rebuild may not be the replica of the original hence there is the risk of data loss
Data may get corrupt during transit
Manual method to recover data from RAID 5 with 2 disk failure has many limitations. Using a professional data recovery software such as Stellar Data Recovery Technician helps to recover lost or inaccessible data from RAID 5 2 Disk failure.
Professional Data Recovery Software to recover data from RAID 5
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Install and launch Stellar Data Recovery Technician software
Select RAID Recovery
From the next available screens, select all parameters as available in the original RAID
Hard Drives in RAID Array
RAID Parity Order Map
Probable Start Sectors
Once all factors are confirmed, the software displays the final configuration of RAID 5 Array
Confirm configuration of RAID Array as available on RAID Reconstruction screen
Once the RAID is built (either by selecting from the given options or software help), the software starts the scanning process for RAID Volumes
The software rebuilds and displays the configured RAID volumes. Select the volume and click Show Volume List button
Volumes available in the RAID are displayed. Select the disk from which data is to be recovered
Click Recover to recover data from the selected drives
Select a destination and click Start Saving
The entire data of the selected volume is recovered at the suggested location.
By using professional RAID recovery software, users have an option to rebuild RAID, recover entire data in the accessible form, and save the recovered data at specified location. Thus, there are little or no chances of software-limitations.
It is comparatively more straightforward and less time taking the process to recover RAID with the help of professional data recovery software. Moreover, after recovery, the data is available in an accessible form. Once you recover data from RAID 5 with 2 Disk failure, you can rebuild the array.
Recovering data from RAID 5 with 2 Disk failure may prove to be quite challenging. However, the timely shutdown of RAID array followed by data recovery with MVP recommended professional software such as Stellar Data Recovery Technician helps in quick and easy recovery without excessive time loss. Moreover, users don’t have to remember the exact configurations of the array as the software provides different options for RAID build. Once the data is recovered, the Storage Administrators can rebuild RAID with ease. Additionally, the software has an inbuilt Drive Monitor that monitors the Drives and provides real-time status of the selected drive based on temperature, performance, and other drive health attributes.