By Derek Vadala
Redundant Array of self sufficient Disks (RAID) know-how is changing into a customary characteristic of computers that aid mission-critical companies like dossier sharing, mail alternate, or net servers. RAID bargains merits to those crucial platforms: more suitable I/O functionality and fail-safe facts storage.Although bandwidth difficulties on networks are good documented, the interior information move bottleneck that exists on the point in each one process may also depart you with confusing functionality matters. RAID is a cheap and easy-to-manage approach to alleviate this bandwidth challenge by means of dispensing the I/O load seamlessly throughout a number of disks and controllers.RAID additionally presents uninterrupted facts entry via disk mirroring and parity algorithms. that suggests structures can stay on-line even in the course of a disk or controller failure. RAID is scalable, making it strong adequate for giant, high-traffic websites and small, serious structures. through the use of RAID, method directors can mix unmarried disks into terabytes worthy of knowledge storage.Managing RAID on Linux covers every little thing method directors want to know to place jointly a procedure which can aid RAID. you are going to find out about the differing kinds of RAID, in addition to linked applied sciences and concerns, and the way to settle on the simplest RAID method on your wishes. With a step by step, hands-on method, the writer courses you thru the install of both Linux software program RAID or a RAID card. The e-book exhibits tips on how to construct an array and optionally set up a high-performance dossier method. Contents include:
* An advent to RAID and Linux
* making plans and structure of your RAID system
* development a software program RAID
* software program RAID instruments and references
* construction a RAID
* functionality and tuning of your RAID system
RAID has develop into the reasonably cheap resolution of option to take care of the ever-increasing call for for facts space for storing. Written for approach directors, strength clients, tech managers, and someone who desires to know about RAID know-how, handling RAID on Linux sidesteps the often-confusing vendor-specific method you'll locate in other places to provide you the immediately tale on RAID. Even non-Linux clients will locate this booklet choked with useful fabric.
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Extra resources for Managing RAID on Linux
Example text
Don’t forget to factor the eventual need for hot-spares into your plan. Choosing the right components can be the hardest decision to make when building a RAID system. If you’re building a production server, you should naturally buy the best hardware you can afford. If you’re just experimenting, then use whatever you have at your disposal, but realize that you may have to shell out a few dollars to make things work properly. 32 | Chapter 2: Planning and Architecture This is the Title of the Book, eMatter Edition Copyright © 2008 O’Reilly & Associates, Inc.
If you plan to use both internal and external devices on the same chain, then you will need to terminate the external portion of the chain. Figure 2-22 shows how to terminate a controller with both internal and external devices. Depending on your controller, you might also need to disable the controller’s termination in the SCSI BIOS, although many cards automatically do this once devices are connected to the external connector. As shown in Figure 2-23, the same methodology applies if you are using only external devices.
All rights reserved. | 27 RAID-50 (striping parity) Users who simply cannot afford to build a RAID-0+1 array because of the enormous disk overhead can combine two RAID-5 arrays into a striped array (see Figure 2-12). While read performance is slightly lower than a RAID-0+1, users will see increased write performance because each side of the stripe is made up of RAID-5 arrays, which also utilize disk striping. Each side of the RAID-50 array can survive a single disk failure. A failure of more than one disk in either RAID-5, though, would result in failure of the entire RAID-50.
