This website uses cookies and similar technologies to understand visitors' experiences. By continuing to use this website, you accept our use of cookies and similar technologies,Terms of Use, and Privacy Policy.

Dec 02 2009 - 10:54 AM
OS Class - 2nd Dec
RAID - Redundant array of independent disks - Redundant array of inexpensive disks Common RAID ----------------- Raid 1 - 100 g 100 g total disk is 100g disk 2 is the mirror of disk 1. cons : 2x cost,write is slower but not the factor of 2. pros : faster reads as it can be parallelized Raid 3- say there are 3 normal disks and there is a parity disk 1 2 3 4 -- --- --- --- 1 1 1 1 0 0 1 1 1 1 0 0 0 0 0 0 disk costs is less however cons : performance is slower because the parity disk has to be modified everytime a single disk is written and it causes the writes to be sequentialized and this causes the disk to be susceptible for failure as it's most often modified. stripe parity so that part of the file system can be put on different disks so that later on they can be parallelized. RAID 5 - here disks are used as parity and data in round robin fashion as in they can be used to store parity as well as data. we get the cost benefit of Raid 3 + parallel performance. Here we spread the parity on disks and can have in two disks for the different blocks.
|By: Pranav Garg|6722 Reads