Attingo is specialized in restoring data from defective RAID 5 arrays. Our technicians work with complex storage systems on a daily basis and therefore are very experienced. They have profound knowledge about internal system strcutures (e.g. firmware), algorithms (e.g. RAID 5 parity) and behaviour of RAID controller, regardless of the file and operating system.
Data loss causes from RAID 5 arrays
At least two hard drives have broken down
If at least two hard drives are defective, the RAID 5 goes offline. This can also happen after a blackout. Servers that are constantly operating may also break down after a restart, even if they have been shut down correcty. It's getting dangerous if a hard drive has been defective for a longer time span and hasn't been exchanged. The RAID is running in degraded mode until the second hard drive breaks down.
RAID 5 rebuild cancelled
It often occurs that a second hard drive falls out during a rebuild. Every sector of every hard drive is triggered. Individual reading errors lead to the affected hard drives not being included in the RAID 5 network anymore.
Defective RAID 5 controller
A defective RAID 5 controller leads to a breakdown of the array. Common causes are bugs, firmware erorrs or defective software.
What to do when a RAID 5 falls out?
A RAID 5 breakdown often means standstill for a whole department or - even worse - the whole company, especially if a virtual server is used on the RAID 5 HOST! High pressure situations like that may come with hasty actions and irrational decisions. Therefore it is crucial to keep calm!
Never change two hard drives at the same time
If two hard drives from the same RAID 5 network are changed at the same time, it can lead to corruptive data after the rebuild.
Force the RAID 5 online? You'll only get one try!
It's very risky to force a RAID 5 online. You should keep in mind that you'll only get one try. Every parameter must be correct in order to prevent corruptive data. That comprises the correct order hard drive order as well as being absolutely sure that the system does not run in degraded mode after a hard drive broke down.
Professional RAID 5 recovery with Attingo
Our staff is available all around the clock
Contact us if you experienced data loss. Give us a call if you have you need an emergency data rescue which has to be performed as fast as possible. To avoid confusion, please label all the hard drives with their position (slot number)
Attingo is rescueing your data already during the diagnosis
After the diagnosis is finished you receive a fixed price offer and a list of saved data. We'll be happy to advise you on our different diagnosis options.
Your RAID 5 does not leave the country
Defective hard drives will neither be sent abroad nor to third-party providers. The data rescue will be solely performed in our in-house clean rooms.
Spare parts store with over 14.500 hard drives
Our extensive spare parts storage allows a quick resuce and provides the basis for RAID recovery. At the moment is comprises around 14.500 spare parts of every manufacturer.
Profound technical knowledge
Fine mechanics and knowledge about internal system structures (e.g. firmware), algorithms and performance of RAID controllers are necessary for a successful RAID recovery. Our specialists have reverse engineered RAID controllers from the following manufacturers: Adaptec Controller, 3Ware, ICP Vortex, Intel, Areca, ATTO, Dawicontrol, HighPoint, LSI, QLogic,
General RAID 5 information - redundancy
RAID 5 is the most popular RAID type, thanks to the high data throughput and performance with relatively low costs. RAID 5 is one of the cheapest options for saving data redundantly on more than one hard drive with a highly efficient storage capacity.
RAID 5 distributes the user data in blocks, but without a determined parity drive. The XOR data and the user data are distributed equally on all the hard drives. At the same time the mechanical load is distrubuted equally as well, because none of the hard drives has a special position within the parity drive.
Data safety is guaranteed thanks to the redundancy, if one hard drive breaks down. If one hard drive falls out or during a rebuild on a previously installed hotspare drive, the performance decreases. That's what we call "degraded mode", when the RAID 5 is temporarly not protected against the breakdown of another hard drive.