Which of the following will protect data loss against catastrophic multiple physical drive failure?
Click on the arrows to vote for the correct answer
A. B. C. D.C.
RAID (Redundant Array of Independent Disks) is a technology that combines multiple hard drives into a single logical unit to improve performance, availability, and redundancy.
RAID 5 and RAID 10 are commonly used in enterprise storage environments to protect against data loss caused by hard drive failures.
RAID 5 uses block-level striping with distributed parity, meaning that data is divided into blocks and written across multiple disks, with parity information spread across all the disks. In the event of a single disk failure, the data can be reconstructed using the parity information stored on the remaining disks.
RAID 10, also known as RAID 1+0, combines two or more RAID 1 mirrored sets in a RAID 0 stripe. This means that data is written simultaneously to multiple disks, with each disk having a duplicate copy on another disk. In the event of a single disk failure, the data can be read from the duplicate copy on the other disk.
Both RAID 5 and RAID 10 can protect against data loss caused by a single disk failure. However, when it comes to protecting against catastrophic multiple physical drive failure, RAID 10 is the better option.
In RAID 5, if more than one disk fails at the same time, the data cannot be reconstructed using the parity information. This is known as the "RAID 5 write hole" problem. With RAID 10, even if multiple disks fail at the same time, as long as each mirrored set has at least one functioning disk, the data can still be read.
Snapshots and tape backups are not effective solutions for protecting against catastrophic multiple physical drive failure. Snapshots provide a point-in-time copy of data and can be used to restore data in the event of logical failures or user errors, but they do not protect against physical drive failures. Tape backups are a slower and less efficient solution for data recovery compared to RAID 10, and they require a separate physical storage location to protect against disasters that could affect the primary data center.