Recovering RAID 6 is a delicate job that requires the best professionals to handle the best and newest technologies for data recovery in RAID System on the market, with the goal of resuming the Servers or Storages affected by data loss.
The RAID 6 system is an evolution of RAID 5. The main difference is that instead of using only one disk for redundancy, 2 disks are used.
In other words, in this system, even if two disks are physically damaged at the same time, the system will still continue working. But the available space will be the total of disks minus 2.
That is, if you set up a RAID 6 with 7 disks, the space you will have available will be the total equivalent of 5 disks.
This system is used in extreme security situations. The RAID 5 system allows only one disk to go bad. If two disks go bad at the same time, or a second disk goes bad before the Rebuild process of the first disk is finished, the system will stop.
RAID 6 allows the same performance as RAID 5, but with more security.
And if data is lost on RAID 6, even though it is difficult, we at Digital Recovery can do RAID recovery.
By reverse engineering and fully understanding the algorithms used in RAID system controllers, Digital Recovery is able to recover data in the vast majority of cases of data loss in RAID systems.
Note: When creating a RAID 6 system, the available space will be the sum of the amount of disks minus 2. The system will use the space of two disks for storage and parity control.
If your project had a negative diagnosis or the execution time does not meet your expectations, we accept the challenge of analysing your case.
Digital Recovery is a company specialized in recovering RAID of all levels. We created a dedicated division to exclusively serve highly complex environments.
This business unit is known as Data Center Recovery Services and specializes in recovering data from RAID systems (0, 1, 10, 5, 50, 6, 60, vRAID, RAID-Z and JBOD), 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 Acropolis).
Even if you have received a negative diagnosis from a data recovery company, we are still happy to analyze your case.
We have developed software and hardware technologies that enable us to act with precision and agility in advanced diagnostic and data recovery processes. The creation of these technologies – many of them proprietary and exclusive – has kept Digital Recovery on the cutting edge.
One of our technologies, called Tracer, is capable of generating differentiated results in data recovery from Virtual Machines, Databases and RAID systems. Through millions of calculations and analysis of millions of records, this technology makes it possible to drastically reduce project execution time, as well as increase success rates to almost 100%.
Other partnerships for information exchange and technology sharing are made between companies in countries such as 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, please consult our 24×7 department.
If you need it, we can also provide you with a Non-Disclosure Agreement (NDA) in a language of your choice. It is important to mention that our NDA is already adapted to GDPR. 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 type of service provides our customers with the ability to perform services 24 hours a day, 7 days a week, 365 days a year.
There is still hope for your lost data, our entire team is at your company's disposal.
The acronym RAID stands for Redundant Arrays of Independent Disks. This is a technology developed to increase performance, security and storage capacity in environments involving servers and On Premise storage, Data Centers and Cloud Infrastructure.
The technology in question began to be developed by researchers at the University of Berkeley (California, USA) in the mid-1980s. This technology is based on the synchronization of several disks, be they SATA, SSHD, Nearline, SAS and FC [Fibre Channel], to form one or more logical disks viewed by both the RAID controller and the operating system chosen to use the logical volume.
The implementation of RAID systems combined with system virtualization, scalable storage containing differentiated technologies such as All Flash Storage and a high-speed Internet have enabled the creation of IT On Premise departments, Data Centers and the much talked about Cloud Computing, where critical business applications are allocated, such as large ERPs like TOTVS, SAP and others.
There are several types of RAID, and the most commonly used are RAID 5, RAID 1, RAID 10, RAID 6 and RAID 0.
In the vast majority of cases yes, it is perfectly possible to recover data in a complete and structured way, including Digital Recovery is a company specialized in data recovery in all types of RAID systems, regardless of the operating system and hardware that the logical grouping of disks is tied.
It doesn’t matter how big or complex your company is or how complex the structure of your servers and storage is. Our professionals, with international experience, will be able to solve your problem with mastery.
For your peace of mind, trust, and safety, we suggest that you view our updated client list, testimonials, and certificates of technical capability provided by federal agencies that have already been successfully assisted in projects involving RAID systems.
The most common situations that cause data to become inaccessible and RAID data loss to occur are:
The structure of RAID systems is based on three major differentials: security, performance and increased capacity of dedicated data storage devices.
The RAID controller is hardware specifically designed for processing information from the volumes and partitions of an array. The controller card has, among others, two main functions:
The first of them is to perform all the calculations regarding the data processing and storage of the parity information in the arrays.
The second function is to store the configuration data of the arrays created and managed by the controller itself.
A common technique used by controllers to protect themselves from problems is to store the data from the managed arrays in reserved areas on the disks used to create the arrays.
This way, if a controller has a problem, a new controller can be installed and then execute the necessary commands to read the configuration data stored in the array disks, avoiding data loss.
This region of the disk is usually known as the DACStore. If the problem is in fact in the controller, because of the protections previously reported, it is very likely that the environment will function normally again.
However, if there is a problem with the information on the disks, the data will still be inaccessible.
We understand the disruption and damage that a RAID server and storage outage can cause to your business. With that in mind, we have created a 24×7 department that is dedicated to assisting customers who have extreme urgency in recovering data from RAID systems.
As soon as disks from a RAID server or storage enter our lab, the advanced diagnostic process begins immediately. The advanced diagnostic process usually takes between 4 to 8 hours. As soon as it is completed, the customer will be informed about the possibilities of data recovery, the amounts involved, as well as the estimated time for recovery.
The average time for data recovery in servers and RAID storage at Digital Recovery is approximately 36 hours, but in some cases, projects have been solved in less than 12 hours. Depending on the complexity of the problem and the type of solution to be adopted, the time for data recovery may extend for a few days, but at all times a specialist will be in contact with the focal point of the customer, to report in detail on all movements made.
Regardless of the number of disks that will be allocated in the array, the system will use the space equivalent to one disk for parity, ie, to get the net space, just multiply the capacity of the disks by the number of disks subtracting one.
Example | Considering 5 disks of 3 TB each, totaling 15 TB of raw space.
Subtracting one disk gives us a total of 4 disks of 3 TB, i.e. 3 TB x 4 = 12 TB
A Degraded RAID is when one or more redundancy disks have stopped working. Depending on the type of Array this will mean a loss in performance.
The surest way to know if the RAID is degraded is to access the controller’s management software. On IBM/Lenovo servers this software is called MegaRAID Storage Manager.
Another way to see it is to see if there are any orange LEDs on the disks belonging to the array in question
The first action to be taken is to contact the manufacturer or technical support of your server or storage. They will direct the diagnosis in the best possible way, because through the logs collected, it will be possible to create a coherent and assertive action plan.
If it is not possible to restore the environment either via the manufacturer or via restore of the most updated backup, we can help you solve this challenge in the best possible way.
Because of the many variables involved in a RAID data recovery project, it is not possible to know the final value without performing a detailed evaluation. The purpose of this assessment is to determine:
To make an assessment, please contact us through our support channels, which are available 24x7x365.
We have compiled a list based on our many years of experience working with data recovery on RAID systems. Before you undertake any procedure to try to recover data from your RAID system internally, consider these considerations:
Never run the Initialize command. This seemingly harmless command (initialize) will completely reset all data on the RAID, making data recovery completely impossible.
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 fails 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.
In some cases yes. Especially when you have an environment with few disks and when you remember exactly the array configurations.
But when you have storage with numerous hard disks, running on multiple volumes, using different RAID configurations and even with Hot Spare disks, even if you have all this documented it will not be an easy task to recreate the array and get it working again.
In the case of Virtualized RAIDs or vRAIDs, even if you have all the configurations noted down, the only possibility of returning the Array is by reading the configurations contained on the disks (DAC Store).
Since we know that disk failure can drastically impact both the availability and integrity of companies’ strategic data, 24×7 monitoring of the health status of disks is extremely important, as it allows the suspect disk to be replaced before it actually fails.
The RAID controller’s own management software can be used for this type of predictive monitoring.