Is RAID 10 the same as RAID 01?

RAID Levels 0 1 (01) and 1 0 (10) Common Name(s): RAID 0 1, 01, 0/1, “mirrored stripes”, “mirror of stripes”; RAID 1 0, 10, 1/0, “striped mirrors”, “stripe of mirrors”. Labels are often used incorrectly; verify the details of the implementation if the distinction between 0 1 and 1 0 is important to you. Technique(s) Used: Mirroring and striping without parity. Description: The most popular of the multiple RAID levels, RAID 01 and 10 combine the best features of striping and mirroring to yield large arrays with high performance in most uses and superior fault tolerance. RAID 01 is a mirrored configuration of two striped sets; RAID 10 is a stripe across a number of mirrored sets. RAID 10 and 01 have been increasing dramatically in popularity as hard disks become cheaper and the four drive minimum is legitimately seen as much less of an obstacle. RAID 10 provides … Continue reading

What is RAID 5 and its features, advantage and disadvantage?

RAID Level 5: Some commonly used RAID Level 5 is a cluster-level implementation of data striping with DISTRIBUTED parity for enhanced performance. Clusters can vary in size and are user-definable but they are typically blocks of 64 thousand bytes. The clusters and parity are evenly distributed across multiple hard drives and this provides better performance than using a single drive for parity. Out of an array with “N” number of drives, the total capacity is equal to the sum of “N-1? hard drives. For example, an array with 4 equal sized hard drives will have the combined capacity of 3 hard drives. This is the most common implementation of data striping with parity. In this example 25% of the storage purchased is used for duplication. Controller Requirements: Requires a moderately high-end card for hardware RAID, supported by some operating systems for software RAID, but at a substantial performance penalty. Hard … Continue reading

What is RAID 1 and its features, advantage and disadvantage?

RAID Level 1: Commonly called Mirroring RAID Level 1 is the pure implementation of data mirroring. In a nutshell RAID Level 1 gives you fault tolerance but it cuts your usable capacity in half and it offers excellent throughput and I/O performance. This RAID level is often used in servers for the system partition for enhanced reliability but PC enthusiasts can also get a nice performance boost from RAID Level 1. 50% of your purchased space will be used for duplication. Description: RAID 1 is usually implemented as mirroring; a drive has its data duplicated on two different drives using either a hardware RAID controller or software (generally via the operating system). If either drive fails, the other continues to function as a single drive until the failed drive is replaced. Conceptually simple, RAID 1 is popular for those who require fault tolerance and don’t need top-notch read performance. A … Continue reading

What is RAID 0 and its features, advantage and disadvantage?

RAID Level 0 Definition: RAID 0, or Redundant Array of Independent Disks, Level 0 – also called striping – is a method of storing data on multiple computer storage devices – usually hard disks or disk partitions – by interleaving the data and spreading it across the devices usually achieving faster read and write speeds. Common Name(s): RAID 0. (Note that the term “RAID 0” is sometimes used to mean not only the conventional striping technique described here but also other “non-redundant” ways of setting up disk arrays. Sometimes it is (probably incorrectly) used just to describe a collection of disks that doesn’t use redundancy.) Description: The simplest RAID level, RAID 0 should really be called “RAID”, since it involves no redundancy. Files are broken into stripes of a size dictated by the user-defined stripe size of the array, and stripes are sent to each disk in the array. Giving … Continue reading

What is the difference between hardware RAID and software raid?

We have explained what raid is and the two types of raid, today we want to discuss the difference between hardware raid and software raid, as many users have been confused by them. Brief introduction about Hardware RAID The hardware-based system manages the RAID subsystem independently from the host and presents to the host only a single disk per RAID array. An example of a Hardware RAID device would be one that connects to a SCSI controller and presents the RAID arrays as a single SCSI drive. An external RAID system moves all RAID handling “intelligence” into a controller located in the external disk subsystem. The whole subsystem is connected to the host via a normal SCSI controller and appears to the host as a single disk. RAID controllers also come in the form of cards that act like a SCSI controller to the operating system but handle all of … Continue reading