Raid Questions Flashcards
What is Raid 0?
Raid 0 is Block-level striping without parity or mirroring.
RAID 0 (also known as a stripe set or striped volume) splits (“stripes”) data evenly across two or more disks, without parity information, redundancy, or fault tolerance. Since RAID 0 provides no fault tolerance or redundancy, the failure of one drive will cause the entire array to fail; as a result of having data striped across all disks, the failure will result in total data loss.
What is Raid 1?
Raid 1 is Mirroring without parity or striping, also known as Duplexing.
RAID 1 consists of an exact copy (or mirror) of a set of data on two or more disks; a classic RAID 1 mirrored pair contains two disks. This configuration offers no parity, striping, or spanning of disk space across multiple disks, since the data is mirrored on all disks belonging to the array, and the array can only be as big as the smallest member disk. This layout is useful when read performance or reliability is more important than write performance or the resulting data storage capacity.[13][14]
The array will continue to operate so long as at least one member drive is operational.
What is Raid 5?
RAID 5 is Block-level striping with distributed parity.
RAID 5 consists of block-level striping with distributed parity. Parity information is distributed among the drives. It requires that all drives but one be present to operate. Upon failure of a single drive, subsequent reads can be calculated from the distributed parity such that no data is lost.[5] RAID 5 requires at least three disks.
What is Raid 10?
A stripe of mirrors.
Combines the advantages of RAID 1 and RAID 0. Requires a minimum of two disks, but will often have four or more. The system contains at least two mirrored disks that are then striped.
what is parity?
Parity is a calculated value that’s used to restore data from the other drives if one of the drives in the set fails.
Which RAID array only offers mirroring?
RAID 1
RAID 1 only offers mirroring, without any striping or parity.
