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Recover files RAID 1
Data loss on RAID 1 is not recurrent, but it can happen. Your system is designed to offer maximum data protection by mirroring the disks.
The idea behind the system is relatively simple, everything that is recorded on one disk is also stored on another disk, obviously RAID needs at least 2 disks to work. It is an alternative to the poor security offered by RAID 0.
No RAID 1 não há nenhum aumento de desempenho dos disco individual, como RAID 0 faz, para fazer a junção da segurança do RAID 1 com o desempenho do RAID 0 foi desenvolvido o RAID 10 ou RAID 0+1.
Although RAID 1 is extremely safe from data loss, failures are not impossible. The main causes of file loss are: Loss of the data in the array, deletion or change in the controller settings, deletion or change of the array volumes, loss of the sequential order of the disks.
In all cases of data loss Digital Recovery is able to act quickly and concisely so that RAID 1 is recovered as quickly as possible.
Why Digital Recovery?
We specialize in data recovery on RAID systems, we have the ability to recover data at any RAID level, this puts us among the few companies in the world specializing in this system.
Our solutions are unique and were developed by our experts, we have dedicated an entire department, known as Data Center Recovery Services, for the recovery of large storage devices and technology development.
From this department came our main technology, TRACER, through which obtained great results in recovering RAID 1. But not only RAID systems, it can also recover Storages (NAS, DAS and SAN) with Host Channel iSCSI, SAS and FC (Fibre Channel) from various manufacturers such as HP / HP, Dell / EMC and IBM / Lenovo, databases (Microsoft SQL Server, Oracle, MySQL, PostgreSQL, MariaDB, Firebird, DB2, Informix, Caché and Btrieve) and virtual machines (Microsoft Hyper-V, VMware, Citrix XenServer, Proxmox and Acropolis).
We are a Brazilian company with a branch in Germany. Other partnerships for information exchange and technology sharing are made between companies in countries like United States, Russia and Ukraine.
In addition to providing services to governments, financial institutions, and small, medium, and large companies, Digital Recovery also provides services to other companies that are also active in the area of data recovery.
If your data is stored on a device located outside of the countries where we have labs, we have the technology to remotely assess and recover your data. If this is your case, please consult our department 24×7.
Should you need it, we can also provide you with a Non-Disclosure Agreement (NDA) in a language of your choice. Important to mention that our NDA is already adapted for GDPR. Please speak to one of our experts about this.
Being fully aware of the existing levels of pressure and urgency in data centre and cloud computing environments, we also offer a 24×7 urgency service. This type of service provides our customers with the ability to perform services 24 hours a day, 7 days a week, 365 days a year.
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Customer experiences
What our clients say about us
"We had a serious problem after a power failure of a NAS server in Raid 5. I immediately contacted DIGITAL RECOVERY. After a few days of hard work the problem was solved."
"One of our raid servers had stopped. After several attempts without solving the problem we found DIGITAL RECOVERY and 5 hours later, at 4am, the data was recovered."
"We appointed DIGITAL RECOVERY in a special case (of data loss) in a raid 5 storage. Digital Recovery was able to recover 32 million files so our customer was extremely satisfied.”
"Without a doubt the best data recovery company in Latin America. The contact Digital Recovery will always be saved on my phone, because inevitably I will need again."
"The quality of the service is excellent. The attention given to customer service is gratifying and the feedback we receive reassures us that we can trust the work and dedication."
Customer since 2017
"Great company, they saved me from a big problem! I recommend, fast service, my thanks to the Digital Recovery team for the attention and quick solution to the problem! Show!"
"Second time that I count with the agility and professionalism of the Digital Recovery team, they are very experienced and agile. I recommend to all"
"They helped me recover some data that I had thought was lost. I had a great experience with the team for their calmness, agility and transparency."
Answers from our experts
What are the main reasons that cause data loss on RAID 1?
RAID 1 can suffer data loss due to logical or physical problems.
Logic problems are:
- Deleting or Corrupting Data on Partitions
- Formatting drives or partitions
- Overwriting information
- Formatting followed by system reinstallation
- System booting problems
- Data desynchronisation from one hard drive to another
Physical problems are:
- RAID controller burn-in or problems
- Burn-in of electronic circuits
- Burn in read heads
- Read head breakage
- Damage to the disk surface (HDD platters)
- Bad Blocks – Defective Sectors
- Natural wear and tear of the media
- Scratches and scratches on the surface
- Serious scratches and scuffs
- Motor bearing seizure
- Motor burn-out
- Dropped or knocked over problems
- Servo Mechanism area related problems
- Firmware problems
- Water or other liquid problems
Is there a specific Care for RAID 1?
Yes! RAID 1 has a low problem rate, because all the content of one hard drive is 100% duplicated on another hard drive. But be very careful with the synchronism of the disks, let me show you why. Take this example:
HD number 01 stops working due to bad contact or cable disconnection. In this case the system does not stop working, because the HD number 02 is exactly the same and continues to work. The RAID controller notifies the user, but as everything continues to work normally with the HD 02, the problem is not given due attention.
A week later a technician is informed of the problem and goes to the site and restarts the disk 01. At that time the RAID controller can choose the hard drive 01 that was off for a week as the main hard drive and mirror it over hard drive 02 where the most up to date data was.
The data will be exactly as it was when HD 01 was shut down, i.e. everything that was done in the meantime will be lost.
Whenever one of the disks stops, make your backups immediately and call a technician to check the problem and if necessary replace the damaged disk.
If by chance both disks stop, look for a specialized company.
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What you need to know
What are the differences between RAID 0 and RAID 1?
While RAID 0 is based on synchronised distribution across all disks in the array, with a focus on performance, RAID 1 has the main focus on data security by applying disk mirroring, i.e. all data stored on one disk is written to another.
Do the disks necessarily have to be identical for RAID 1 to work?
No, the disks can be different. But, the controller will always use the disk with lower storage capacity with the ruler to equalize the system. That is, if the HD 01 is 1TB and HD 02 is 500GB, the controller will work with storage space of only 500GB.
Why is data lost in RAID 1?
A RAID 1 system is a type of RAID with 100% redundancy. This means that all information on one disk is mirrored or written to another disk. Even when using two disks, only a volume equivalent to one disk will be presented to the operating system.
Whenever the user makes any change to the volume the system responsible for managing RAID 1, (either by software or hardware) will replicate this change automatically on both disks. Once I have 2 mirrored disks and exactly equal what are the possibilities of data loss?
Although there is the possibility of simultaneous failure of the two disks, this possibility is very small. Most data losses on RAID 1 that we receive for recovery come from RAID management failures. See the following situations:
After 2 years of continuous use of a RAID 1, one of the disks failed with bad block issues. Because this disk is no longer in normal use, the controller or array management software will discard any attempt to write or read to this disk.
The system will also warn the user of the problem so that they can replace the failed disk quickly. This is exactly where most of the problems occur. Because the system continues working normally, because one of the disks is still 100% functional, the user does not pay attention to the warning and continues using the machine.
Six months later, the second disk fails. But this time instead of only presenting failures caused by bad blocks the RAID disk is completely inaccessible.
When trying to solve the problem connecting the disks in another computer or sending to a technical assistance the only disk that will still be accessible is the disk that stopped first (6 months ago), because even presenting bad blocks may still be possible to access some information, but, of 6 months ago.
Because much of RAID 1 are mounted on common machines and without the infrastructure (Enclosure and RAID Controller) necessary for RAID systems, they are much more susceptible to failure. Because of this, another problem can happen when one of the disks presents problems in the cable or connection to the motherboard.
Although the disks are without any problems, a bad contact in the connection cable of one of them interrupts communication. The Array management system warns the user, but he does not notice. As there is 100% redundancy of the data on another disk, the machine will continue working normally and without performance problems.
Some time later, when doing maintenance on the computer, the cables are disconnected and reorganised. In this maintenance there is a risk of reconnecting the HDs in different ports and confusing the system. Once two disks are connected in RAID 1 again the system will identify that they are not equal, because there is enough time that one of them was disconnected from the RAID.
At this point the system will update the information from one disk on the other. As the disks were connected on different ports, the system can simply copy the disk with old information on the disk with new information.
Following the same line of problems mentioned above, when one of the disks of RAID 1 fails and the user continues to use the system, there is the possibility of data loss if for some reason the user recreate the array.
By doing so, the system will identify that the content of the disks are not exactly equal. At this time the system will copy the information from the first disk to the second and data overlapping may occur.
