We have developed unique solutions that can recover data on RAID 1
Recover RAID 1
Data loss on RAID 1 is not recurrent, but it can happen. Your system is designed to provide 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 two disks to work. It is an alternative to the poor security offered by RAID 0.
In RAID 1 there is no increase in performance of the individual disks, as RAID 0 does, to make the junction of the security of RAID 1 with the performance of RAID 0 was developed RAID 10 or 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, and have the ability to recover data on any RAID level, making us one of the few companies in the world that specializes 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 the development of technologies.
From this department came our flagship technology, TRACER, through which we achieved great results in RAID 1 recovery. 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/HPE, 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 Acrópolis).
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 the 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 enable us to assess and recover your data remotely. If this is the case for you, 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. Please talk to one of our experts about this.
Being fully aware of the existing levels of pressure and urgency in data center and cloud computing environments, we also offer a 24×7 urgency service. This 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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Answers from our experts
What are the main reasons that cause data loss on RAID 0?
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 desynchronization from one hard drive to another
Physical problems are:
- RAID controller burn-in or problems
- Burnout of electronic circuits
- Burn in read heads
- Read head breakage
- Damage to the disk surface (HDD platters)
- Bad Blocks
- Natural Media Wear
- Surface scratches and scuffs
- Serious scratches and scuffs
- Motor bearing seizure
- Motor burn-out
- Dropped or impacted problems
- Servo Mechanism area related problems
- Firmware problems
- Problems with water or other liquids
Will replacing the RAID controller bring my data back?
Yes! RAID 1 has a low problem rate, because all the contents of one hard drive are 100% duplicated on another hard drive. But be very careful with disk synchronization, let me show you why. Here is an example:
HD number 01 stops working due to bad contact or cable disconnection. In this case the system does not stop working, because HDD number 02 is exactly the same and keeps working. The RAID controller warns the user, but since everything keeps working normally with HDD 02, the problem is not given the attention it deserves.
A week later a technician is informed of the problem and goes to the site and reconnects disk 01. At this point the RAID controller can choose the hard drive 01 that had been 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 HD01 was shut down, i.e. everything 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 replace the damaged disk if necessary.
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 synchronized 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.
Can I recover data when two or more RAID disks fail simultaneously?
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 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 is presented to the operating system.
Whenever the user makes any changes to the volume the system managing RAID 1, (either software or hardware) will automatically replicate these changes to both disks. Since I have two mirrored disks that are exactly the same, what are the chances of data loss?
Although there is a possibility of simultaneous failure of both disks, this possibility is very small. Most data losses in RAID 1 that we receive for recovery come from RAID management failures. Take 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 he/she 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 having failures caused by bad blocks, the RAID disk is completely inaccessible.
When trying to solve the problem by connecting the disks to another computer or sending them to a service center, the only disk that will still be accessible is the one that failed first (6 months ago), because even with bad blocks it may still be possible to access some information, but from 6 months ago.
Because a good part of RAID 1 are mounted on ordinary 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 has cable or motherboard connection problems.
Although the disks are without any problems, a bad contact in the cable connecting one of them interrupts communication. The Array management system warns the user, but he does not notice. Since there is 100% redundancy of the data on another disk, the machine will continue running normally and without performance problems.
Some time later, when doing maintenance on the computer, the cables are disconnected and reorganized. In this maintenance you run the risk of reconnecting the hard drives to different ports and confusing the system. Once two disks are connected in RAID 1 again the system will identify that they are not the same, because one of them has been disconnected from the RAID for a long time.
At this point the system will update the information from one disk on the other. Since the disks were connected to different ports, the system can simply copy the disk with old information onto the disk with new information.
Along the same lines as the problems mentioned above, when one of the disks in RAID 1 fails and the user continues to use the system, there is the possibility of data loss if for some reason the user recreates the array.
In doing so, the system will identify that the disks’ contents are not exactly the same. At this point the system will copy the information from the first disk to the second, and data may overlap.