Attingo is specialized in restoring data from defective RAID 5 arrays. Our technicians work with complex storage systems on a daily basis and have nearly every RAID-controller reverse engineered. 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.
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. Our frequent recovery of failed RAID systems guarantees you know-how and routine, even when handling very complex errors.
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The failure of at least two hard drives at the same time result in an offline RAID 5. This can happen after a blackout. Even server, that were in 24/7 use for a long period of time and were shut down correctly can be affected by a RAID-failure after a reboot. This is particularly risky, if one hard drive failed a while ago and wasn't replaced. The array runs in degraded mode until a second hard drive fails.
One of the most frequent causes for data loss from RAID 5 systems is a cancelled rebuild. All of the sectors of every hard drives are being accessed and even one read error can lead to an ejection of the affected hard drive out of the RAID 5 array.
A defective RAID 5 controller can lead to a failure of the array. Common reasons are bugs, firmware errors or faulty software.
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 distributed equally as well, because none of the hard drives has a special position within the parity drive.
Data safety is guaranteed thanks to redundancy. If one hard drive fails during a rebuild on a previously installed hot spare drive, the performance decreases. That's the so-called "degraded mode", when the RAID 5 is temporarly not protected against the failure of a second hard drive - no matter if SCSI, SAS or SATA.