Linux System Calls Question:
Download Questions PDF

Difference between Raid 1 and Raid 5?


Answer #1
RAID 1 is disk striping. no mirroring no parity. Minimum 2 disks required. If any
One disk fails all the data get lost.
RAID 5 is disk striping with parity. Minimum 3 disks required. if anyone disk fails
Data is safe, if two fails data get lost.

Answer #2
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.

RAID 5 consists of block-level striping with distributed parity. Unlike in RAID 4, 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.[20]

Download Linux System Calls Interview Questions And Answers PDF

Previous QuestionNext Question
How will you harden the server?What is the largest disk size can be used in LVM?