How to configure Software RAID and LVM in linux
Author: Balamukunda Sahu
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This video is explaining about how to configure software raid and lvm in linux What is RAID =========== RAID is an acronym for Redundant Array of Independent (or Inexpensive) Disks. In fact, RAID is the way of combining several independent and relatively small disks into a single storage of a large size. The disks included into the array are called array members. The disks can be combined into the array in different ways which are known as RAID levels. Each of RAID levels has its own characteristics of: A. Fault-tolerance which is the ability to survive of one or several disk failures. B. Performance which shows the change in the read and write speed of the entire array as compared to a single disk. C. The capacity of the array which is determined by the amount of user data that can be written to the array. The array capacity depends on the RAID level and does not always match the sum of the sizes of the RAID member disks. RAID techniques ============== A. Striping : =========== splitting the flow of data into blocks of a certain size (called "block size") then writing of these blocks across the RAID one by one. This way of data storage affects on the performance. B. Mirroring : ============ Mirroring is a storage technique in which the identical copies of data are stored on the RAID members simultaneously. This type of data placement affects the fault tolerance as well as the performance. C. Parity : ========= Parity is a storage technique which is utilized striping and checksum methods. In parity technique, a certain parity function is calculated for the data blocks. If a drive fails, the missing block are recalculated from the checksum, providing the RAID fault tolerance. RAID levels ========== A. RAID 0 - based on striping. This RAID level doesn't provide fault tolerance but increases the system performance. B. RAID 1 - utilizes mirroring technique, increases read speed in some cases, and provides fault tolerance in the loss of no more than one member disk. C. RAID 5 - utilizes both striping and parity techniques. Provides the read speed improvement as in RAID 0 approximately, survives the loss of one RAID member disk. Software RAID ============ Software RAID is one of the cheapest RAID solutions, Software RAID is created based on the user's computer and therefore it uses the host system CPU for implementation. It should be noted, that in case of RAID levels 0 and 1, CPU load is negligible, but for the RAID types based on parity, CPU load can vary from 1 to 5 percent depending on CPU power and the number of the disks, which is also negligible for practical purposes. There are certain limitations on the use of the software RAID to boot the system. Only RAID 1 can contain boot partition, while system boot is impossible with a software RAID 5 and RAID 0. Hardware RAID ============== Hardware RAID is created using separate hardware. Basically there are two options: a. inexpensive RAID chip possibly built into the motherboard. b. more expensive option with a complex standalone RAID controller. Such controllers can be equipped with their own CPU, battery-backed up cache memory, and they typically support hot-swapping. A hardware RAID has some advantages over a software RAID, such as: 1. doesn't use CPU of the host computer; 2. allows user to create boot partitions; 3. handles errors better, since communicates with the devices directly; 4. supports hot-swapping. For More Documentation Go to my Blogger below : http://itechnologysoln.blogspot.com/p/raid-lvm-configuration-at-os.html How to configure Software RAID and LVM in linux https://youtu.be/gLmoLEu4acU Configuring Software RAID | Software RAID Configuration | Raid configuration in RHEL 6 | How to Configure Software RAID on Linux | software raid | software raid in linux | software raid configuration | How to setup software RAID in linux | Create Software RAID | linux software raid | software raid 5 | raid | linux software raid 5 | raid software For more videos and tutorials click on My Website... http://www.elinuxbook.com Like us on - https://www.facebook.com/ITechnologySolution Subscribe on - https://www.youtube.com/user/bala9339?sub_confirmation=1 Tweet us : https://twitter.com/itechnologysoln Follow us : https://plus.google.com/u/0/+BalamukundaSahu Pin us : Feel free to Comment on video for any queries or you can blog on My blogger.