RAID 6 Data Recovery, RAID 60 Data Recovery Services

RAID 6  is further step for Data Warehouse technologies, especially designed for less reliable, but much bigger in capacity and chipper desktop class hard drives.

In RAID 6 data is striped across several physical drives and dual parity is used to store and recover data. It tolerates the failure of two drives in an array, providing better fault tolerance than RAID 5. It also enables the use of more cost-effective, but less reliable, ATA and SATA disks for business critical data.

This RAID level 6 is similar to RAID 5, but includes a second parity scheme that is distributed across different drives and therefore offers extremely high fault tolerance and drive-failure tolerance. RAID 6 can withstand a double disk failure.

RAID 6 requires a minimum of four disks and a maximum of 16 disks to be implemented. Usable capacity is always 2 less than the number of available disk drives in the RAID set.

With less expensive, but less reliable SATA disk drives in a configuration that employs RAID 6 , it is possible to achieve a higher level of availability than a Fiber Channel Array using RAID 5. This is because the second parity drive in the RAID 6 RAID set can withstand a second failure during a rebuild. In a RAID 5 set, the degraded state and/or the rebuilding time onto a hot spare is considered the window at which the RAID array is most vulnerable to data loss. During this time, if a second disk failure occurs, data is unrecoverable. With RAID 6 there are no windows of vulnerability as the second parity drive protects against this.
 RAID 60  combines multiple RAID 6 sets with RAID 0 (striping). Dual parity allows the failure of two disks in each RAID 6 array. Striping helps to increase capacity and performance without adding disks to each RAID 6 array (which would decrease data availability and could impact performance in degraded mode).

RAID 60 comprises RAID 0 striping across lower-level RAID 6 arrays. The benefits of RAID 5 are gained while the spanned RAID 0 allows the incorporation of many more disks into a single logical drive. Up to two drives in each sub-array may fail without loss of data. Also, rebuild times are substantially less than a single large RAID 6 array with the same number of physical drives.

There are 4 transition events in a RAID 6 (RAID 60) failure:

• Time to operational failure. Drive failure distributions are not constant. Sub-populations of drives may have specific failure modes, like infant mortality, that MTTDL models do not account for.
• Time to restore. Minimum restore times are functions of several variables, including HDD capacity, HDD data rate, data bus bandwidth, number of HDDs on the bus and the on-going I/O load on the array. Because of these factors, a 2 TB hard drive might take 40 hours or more to restore
• Time to latent defect. Latent defect rates vary with usage, age and drive technology.
• Time to scrub. Scrubbing is a background process meant to find and repair latent errors. Busy systems have less time to scrub which increases the chance of a latent error hosing a RAID 5 rebuild. Scrub strategy has a major impact on latent error rates.

RAID manufacturers differ vastly in their designs of the internal components and circuitry of their hardware and an in-depth knowledge of these designs are crucial for successful data recovery. But because manufacturers do not disclose this information, RAID recovery techniques  require many years of development and reverse engineering in order to determine which ones are the most effective.

Being experts in the recovery of both single hard drives and striped volumes perfectly places Data Recovery Services to recover your critical files from this and any other type of array/volume.

We recover data from any hard drive RAID arrays made by but not limited to the following manufacturers: