Welcome Guest | Sign In
Salesforce Industries Summit
E-Commerce Times TechNewsWorld CRM Buyer LinuxInsider

E-Commerce Times Talkback

ECT News Community   »   E-Commerce Times Talkback   »   Re: Corporate RAIDing on Rise in Storage Arena

Re: Corporate RAIDing on Rise in Storage Arena
Posted by: Robyn Weisman 2004-02-05 07:15:49
See Full Story

The world of data storage can be as confusing as Alice in Wonderland's Tulgy Wood to companies seeking the best and most cost-efficient way to gather and save information. The typical home-user approach -- backing up data on a hard drive -- is not sufficient for corporations. RAID, on the other hand, applies a networked storage framework to the concept of hard drives and has become a primary component of enterprise storage systems. How does this technology work, and which companies produce RAID systems?

Re: Corporate RAIDing on Rise in Storage Arena
Posted by: Sciandu 2004-05-14 18:24:11 In reply to: Robyn Weisman
There are a number of other RAID levels besides RAID 1-5. While some of them are arguably irrelevant (6, 7, 53) there are three VERY important ones that you failed to cover:
RAID 0: This mode simply stripes data across two or more drives. This increases your likelihood of losing data (if one drive fails you're toast), but increases throughput dramatically. This can be very handy in situations where you need high-throughput temporary storage (video processing, session storage, etc.) but it's most interesting in because of two other RAID levels: 0+1 and 10.
RAID 0+1: This mode pairs drives into stripe-sets and then mirrors data across those stripesets. This gives you redundancy AND throughput. This mode is almost as reliable as RAID 1 -- either stripeset can die and you can still operate -- and almost as fast as RAID 0 -- you get the benefit of striping but pay the penalty of synchronous mirroring. Think of this as mirroring data across two very fast drives, each of which happens to have a higher likelihood of failure than a typical hard drive. (You can use more than 4 drives by making your stripesets stripe across more than 2 drives -- this improves throughput and capacity but increases risk of one of your stripesets dying.)
RAID 10: This is the opposite of RAID 0+1. Instead of mirroring data across stripesets you stripe data across mirrored pairs of drives. (Got that?) Think of it as striping your data across drives that are slightly slower than typical drives but much more reliable. This performs similarly to RAID 0+1 but is more reliable because more drives can simultaneously fail without causing data loss (one drive from each mirrored pair vs. one drive for RAID 0+1).
These modes -- particularly 0+1 and 10 -- are commonly seen in lower end configurations (software-based RAID setups or systems using low-end RAID controllers to direct-attach cheap off-the-shelf drives) such as smaller Linux mail or database servers.
Jump to:
When considering a new smartwatch, which feature set is most important to you?
Alerts and Notifications
Calls and Messaging
Clock and Time Tracking
Contactless Payments and Banking
Design and Personalization
GPS and Maps
Health and Fitness
Music and Video