Raid 5 is one of the most common raid methods. It also has a certain data protection mechanism. If one of the disks is broken, after inserting a new disk, data recovery will be automatically performed by the check code on other disks. However, such a mechanism is not enough for the data protection mechanism. What should happen if the following situations occur?
Failure of multiple disks in sequence or at the same time
The instability of the induced voltage causes the system to malfunction.
Hardware failure due to excessive temperature difference
RAID data is deleted or formatted
Send a failure on the server and NAS firmware
RAID controller has failed
New initialization of RAID 5 requires recovery of data
A German company specializing in raid 5 data recovery summarizes some common raid 5 recovery issues.
Two of the three hard drives are broken. Is it possible to recover data from RAID 5?
In most cases, data can be recovered on two defective disks. However, at least one of the two failed hard drives in the clean room needs to be restored. The remaining RAID 5 data can then be recovered from the fragmentation and parity data. We use manual and proprietary semi-automatic programs to save data whenever possible. This makes the recovered data quality very high.
How expensive is RAID 5 data recovery?
The cost of RAID 5 data recovery depends on
RAID 5 configuration (standard or specific)
Defective hard drive (or SSD)
A data recovery attempt has been performed (usually leading to more effort)
Is data coverage, such as reconstruction failure?
After RAID 5 analysis, we can determine how much effort is needed to recover the data. At the same time, you will receive a fixed price for RAID 5 data recovery.
Which file systems allow RAID 5 data recovery?
In the event of a RAID 5 array failure, using the operating system (Windows, Linux, MacOS, etc.) and the file system used on the RAID volume does not initially play a decisive role in data recovery. So this is possible with all file systems. When it comes to deleting data, formatted RAID drives and other logical corruptions (snapshot deletions, etc.), the file system used is much more relevant to the data recovery effort and the likelihood of success.
These file systems are usually RAID 5 data recovery
NTFS (Windows)
FAT32 (Windows)
Ext3, Ext4
BtrFS (various NAS manufacturers, Windows, Linux)
HFS / HFS + (Apple / Mac)
APFS (also Mac)
vmFS (vmWare file system)
RAID 5 is gone, can I swap disks for testing?
In many cases, the arbitrary replacement of the disk order in RAID 5 will result in a large amount of deterioration of the RAID data. This often leads to unnecessary data error coverage, resulting in further logical corruption. It is always important to record the order and mark it on the hard disk before deleting the hard disk. After that, we can analyze the RAID.
I started to rebuild more than 12 hours ago. How long does it take?
RAID rebuild (that is, RAID 5 data is reorganized after failure and replacement of the hard disk) is usually not too long. Of course, the time to rebuild depends on the size and number of hard drives, as well as the entire system (server speed, controllers, etc.).
If the reconstruction lasts for several days, you can assume that there is an error. Usually fatal damage to the file system at this point, which can only be recovered by professional data recovery.
Can you read RAID 5 data without a controller?
For RAID 5 data recovery, we do not need a RAID controller. Recovery is always multi-layered. First, the personal hard drive, if there is a defect, rebuild. The raw data is then virtually restored to the RAID array. The often existing inconsistencies are then reconstructed through manual steps and specially developed techniques. Therefore a RAID controller is not required.
Can I recover RAID 5 data from a defective NAS?
RAID 5 data recovery is possible, as well as server/storage systems and NAS (network attached storage). However, NAS typically does not use a standardized RAID5 configuration, but instead uses a proprietary so-called proprietary RAID array. Although these specific configurations are mostly based on standard RAID, their layout is mostly undocumented, so data recovery costs are usually higher.
The most common NAS data recovery is performed by the following NAS manufacturers:
Synology NAS Data Recovery
QNAP NAS data recovery
Thecus Data Recovery
Buffalo NAS Data Recovery
WD NAS data recovery
The data has been removed from RAID 5. Can the data be saved after more than two weeks?
After deleting the data in RAID 5, you should take action as soon as possible. If the deletion is intentional or unintentional, but unrecognizable, data loss is likely not to be discovered immediately.
Whether data recovery may depend on other factors:
The size and type of the data (file type)
Rewriting data in the same area at the same time?
How busy is the RAID volume (used/available memory)?
Which data carriers are used in RAID?
Based on these factors, you can determine the likelihood of successfully recovering deleted RAID 5 data.
This article describes the common problems with data loss in the RAID5 system. At the same time, it reminds everyone that if your system has data loss, don't be tempted by the system if you are not sure, so as to avoid mistakes and errors, resulting in permanent loss of data. You should contact a professional data recovery vendor.
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