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In this post, we have discussed some common symptoms of RAID array failure, their causes, and most importantly, steps to reconstruct a failed or broken RAID array safely and recover data with Stellar Data Recovery Technician software. Get the software now!
RAID arrays are quite robust and reliable data storage solution to store business data and run critical business tasks or applications without any problem. However, the mechanical nature of hard drives makes RAID configuration prone to failure. A RAID may break or become inaccessible due to one or more disk failure or related errors—leading to significant data loss and downtime.
Other errors such as human errors, controller failure, abrupt shutdown, power loss, or power surge, etc. could also break or corrupt a RAID array and cause partition loss.
Symptoms of RAID failures are closely related to symptoms of the hard drive failure that are used in the RAID array. The chances of a RAID server failure can be easily analyzed by checking the condition and performance of the associated RAID disks by using an open-source tool like CrystalDiskInfo.
Beside RAID disks, there are a few other symptoms of RAID failure that you may observe when a RAID is about to fail. These include,
1. RAID Partition Loss
RAID partition loss may happen due to virus or malware intrusion, which can corrupt the header of a RAID partition and make it disappear. Other factors, such as power surge, hardware or software errors, bad sectors, can also cause partition loss.
Sometimes, replacing a failed RAID drive incorrectly in a RAID array may lead to partition loss.
2. Frequent Read/ Write Errors
If you are experiencing frequent read/write errors while accessing or transferring data from RAID, it indicates an underlying problem with your RAID array that may lead to data loss.
3. Data Corruption
Data corruption may occur due to bad sectors that appear on the disk with time and usage. A RAID array with older or ageing drives may fail to reallocate bad sectors, which can lead to data corruption and RAID failure.
4. RAID Server Crash
A RAID server may crash due to failing drive, software error, and a problem with the RAID controller.
5. RAID Controller Errors
A hardware RAID controller may show errors due to problems with the hard drive or after RAID rebuild if the new drive is added to the array incorrectly. The system may fail to detect RAID partitions. In such a case, changing to a new RAID controller doesn’t work as RAID metadata is typically tied to the particular RAID controller.
If a RAID (RAID 0, 5, or 6) server fails, breaks or shows errors, follow the steps mentioned below to reconstruct the RAID and recover data safely.
Step 1: Precautions
Step 2: Backup Data
Before anything else, backup data from the RAID server, if it’s accessible. Backup is critical. For instance, in a RAID 5 array, if a disk has failed, the RAID enters into degraded mode and loses its fault-tolerance. In such a case, immediately back up your data from the RAID before replacing the failed RAID drive to avoid multiple disk failure.
IMPORTANT NOTE: RAIDs are not backup or an alternative to backups. RAIDs do fail and may cause permanent data loss, sometimes beyond recovery.
Step 3: Check the Drive Health Status
Use a tool such as CrystalDiskInfo to check the SMART status of RAID disks. For better and deeper insights about the disk, install the demo version of Stellar Data Recovery Technician and go to More Tools>Drive Monitor.
The Drive Monitor displays overall disk health, performance, temperature, and SMART status of the disk. If the health is poor or SMART shows warnings, use ‘Clone Disk’ option to clone your RAID disk.
Step 4: Reconstruct Broken, Corrupt, or Inaccessible RAID Server for Recovery
To reconstruct a failed RAID and recover data safely, you need an advanced RAID drives data recovery software such as Stellar Data Recovery Technician. The software recovers lost, deleted, and formatted data from any Windows-based RAID 0, RAID 5, and RAID 6 server. Install the software on your Windows machine and then follow these steps:
Tip: Check the list of supported file types via Settings>File List. To add a new file type or format, click ‘Add Header’ tab and add a few sample files of the particular file format that you want to recover.
TIP: In case you forgot the parameter values, choose ‘Don’t know’ options from the drop-down and select probable values
If provided RAID parameters are incorrect, the software automatically detects and reconstructs a few probable virtual RAIDs for data recovery.
WARNING: Never select any RAID disk, which is a part of the reconstructed RAID array, to save recovered data. Get a separate external disk(s) to save the recovered files and avoid data overwriting?
The most common reasons for RAID failure are hard disk errors and human errors. However, with regular backup and adequate measures (discussed below), you can avoid data loss due to RAID failure.
By monitoring and analyzing RAID disk health, you can take appropriate & time-bound measures to backup data from your RAID array and safely replace the failing disk with a new without breaking the RAID configuration or risk of data loss
If you have any queries or suggestions regarding RAID data recovery, leave them in the comment section below. You may also reach us via call, chat, or email for more help.
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“We had RAID failure, and after diagnosing, we got the “”DegradedArray event was detected on device md dev/md/1″” or “”ARRAY IS DEGRADED – 1 disk is missing”” error. What does this mean?
Will the error will affect our data, and can we restore the data via RAID recovery software ?”
We had RAID failure, and after diagnosing, we got the “DegradedArray event was detected on device md dev/md/1” or “ARRAY IS DEGRADED – 1 disk is missing” error. What does this mean?
Will the error will affect our data, and can we restore the data via RAID recovery software