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"Disk Mirroring" uses only one disk controller where as disk duplexing option uses additional disk controller. In RAID 1 aka Disk Mirroring, one drive in the array acts as "Mirror" drive, backing up all the data on the primary drive on-the-fly. "Duplexing" option adds another disk controller, in case one controller fails, the other controller will take over automatically with out any interruption in the service.

It looks like Dell/Equallogic won the mid-size storage array of the year. I am currently working with a customer to get rid of one. My guess on why it has such a large install base in this industry is the fact that it is the standard of one of the large IT support firms that do support in my industry. It does work. It can be fairly slow and uses RAID-50. Yes, RAID-50. Each unit itself can only have 14 disks and dual controllers. It is pure iSCSI. If you want to add disk, you add a unit and create a group. The group is basically a multitude of units in which a pool of storage is created. Hosts connect to the group IP and that forwards you to the correct unit to get your data. It is basically the same thing the big guys are trying to do with storage virtualization. EMC and Netapp have been doing similar stuff on a larger scale. The idea is cool. You pop one of these and add it to the group and it auto-configures its RAID groups, IP info, disks, access, etc. Pretty neat. It is a slo...

What Is RAID? Organizing Data Storage for Availability and Performance Choosing RAID Levels and Concatenation Comparing RAID Level and Concatenation Performance Storage Management provides storage management using RAID (Redundant Array of Independent Disks) technology. Understanding storage management requires an understanding of RAID concepts, as well as some familiarity with how your system's RAID controllers and operating system view disk space. What Is RAID? RAID (Redundant Array of Independent Disks) is a technology for managing how data is stored on the physical disks that reside in your system or are attached to it. A key aspect of RAID is the ability to span physical disks so that the combined storage capacity of multiple physical disks can be treated as a single, extended chunk of disk space. Another key aspect of RAID is the ability to maintain redundant data which can be used to restore data in the event of a disk failure. RAID uses different techn...

RAID stands for Redundant Array of Inexpensive Disks. This is a method of improving the performance and reliability of your storage media by using multiple drives. The drives are configured, so that the data is either divided between disks to distribute load, or duplicated to ensure that it can be recovered once a disk fails. Both can also be implemented together, to obtain both benefits, although more drives will be used. Hardware RAID was the initial type of RAID available, where a specially built RAID controller handles the drives so that the processes are almost transparent to the host computer. Software RAID is a newer type of RAID where no specialized hardware is needed, and the host computer is responsible for the drives. Obviously, hardware RAID is pricier compared to software RAID, due to the extra hardware that you need to purchase. The hardware is typically expensive, and adds a substantial amount to the cost of the whole system. On the flip side, the cheap software RAID c...

RAID stands for Redundant Array of Inexpensive (Independent) Disks. On most situations you will be using one of the following four levels of RAIDs. RAID 0 RAID 1 RAID 5 RAID 10 (also known as RAID 1+0) This article explains the main difference between these raid levels along with an easy to understand diagram. In all the diagrams mentioned below: A, B, C, D, E and F – represents blocks p1, p2, and p3 – represents parity RAID LEVEL 0 Following are the key points to remember for RAID level 0. Minimum 2 disks. Excellent performance ( as blocks are striped ). No redundancy ( no mirror, no parity ). Don’t use this for any critical system. RAID LEVEL 1 Following are the key points to remember for RAID level 1. Minimum 2 disks. Good performance ( no striping. no parity ). Excellent redundancy ( as blocks are mirrored ). RAID LEVEL 5 Following are the key points to remember for RAID level 5. Minimum 3 disks. Good performance ( as blocks are striped ). Good redundanc...

Computers are used to store important data and loss of that data could result in big losses. Here are some RAID data recovery and prevention tips for you. RAID - What is it? To know more about RAID, we would need to go back to the 1980’s and 1990’s because that is the time when computer information servers were facing a dramatic increase in the amount of data that they needed to store and serve. Since storage technologies were getting expensive as they involved placing a large number of high capacity drives in the servers, a solution was needed. That was how RAID was born! RAID stands for Redundant Array of Inexpensive Disks and is a system developed so that a large number of low cost hard drives can be linked together to form a single large capacity storage device that offers superior performance, reliability and storage capacity compared to older storage solutions. Previously RAID was used for storage in the server and enterprise markets but in the last 5 years this software ha...

Often data needs to be stored in more than one secondary storage device. In such cases, RAID technology is used. In all, there are seven RAID levels. The following article presents RAID 5 vs RAID 1 comparison. What if your computer memory system crashes, and you don't have any backup of your data stored elsewhere? Crashing of the hard drive puts one in a difficult situation. The RAID (redundant array of independent disks) data storage system is designed in such a way that data recovery is possible even if storage devices fail. The RAID disks (tape disks or magnetic disks) are so arranged that it allows maximum redundancy (mirroring or repetition). Some RAID architectures are designed for faster read operation, some for faster write operation, while some are designed for both faster read and write operations. Hence, we not only need to understand RAID 5 vs RAID 1 comparison, but each level of RAID needs to be understood. Following are a few points on RAID 5 vs RAID 1 comparison. ...

RAID is nothing but a storage scheme. There are various schemes under RAID, like RAID 0, RAID 1, RAID 5, RAID 10, etc. This is an article that will provide you with the RAID 5 vs RAID 10 comparison. There is often a comparison between RAID 5 and RAID 10 and a debate on the difference between RAID 5 and RAID 10. This article has thus been written, to present the RAID 5 vs RAID 10 comparison. But before we start with the RAID 5 vs RAID 10 comparison, we need to know what is RAID? What is RAID? RAID is the acronym for Redundant Array of Independent Disks and was previously known as Redundant Array of Inexpensive Disks. The words were changed as the word inexpensive probably pushed the fact into the mind of users, that the hard drives were cheap. This probably prompted the data storage device manufacturers to change the name. RAID level 5 and RAID level 10 are storage schemes, that are mainly used in servers. Let us now try to compare RAID 5 and RAID 10 on the various aspects, for wh...

RAID, now known as the Redundant Array of Independent Disks, was previously known as the Redundant Array of Inexpensive Disks. However, hard disk manufacturers probably thought of getting the conception of inexpensive out of the mind of consumers, hence thought to change the full form of RAID to Redundant Array of Independent Disks. Now, let us try to reason as to why was RAID implemented and hence, try to understand the importance of getting RAID levels explained. The term RAID was first coined and defined by David A. Patterson, Garth A. Gibson and Randy Katz at the University of California in 1987. The reason was simple. To combine multiple hard drives to provide high performance as well as high availability. However, the implementation of RAID was not limited to just that. Different RAID levels were used to deal with different situations. First of all, when hard drives are connected in parallel, then data can be accessed at a faster rate. Other situations that were dealt with by t...