Disk mirroring is used commonly in on-line database systems where it’s … Depending on the configuration of the RAID (typically referred to as the RAID level), the benefit of RAID is one or more of increased data integrity, fault-tolerance, throughput or capacity compared to single drives. RAID stands for Redundant Array Of Independent Disks.Originally is was known as Redundant Array Of Inexpensive Disks. It is also not available on older disk units that do not have a high-availability option. For comparison information between RAID-5 and RAID-6, refer to Rochester Support Center knowledgebase document New, Benefits of RAID 5 and RAID 6 Device Parity Protection. When computer people talk about RAID, they generally refer to RAID-5. This is called mirroring, and it ensures you won’t lose your files if a drive fails. RAID-1 uses mirroring … As you can see in the above diagram, data is represented by A1, A2, and A3. Device parity protection can prevent your system from stopping when certain types of failures occur. A RAID 0+1 array combines the high data access rate of a RAID level 0 array and the data protection (redundancy) of a RAID level 1 mirror by striping data across two drives and mirroring that striped data on a second set of two drives. Parity: It needs at least three drives and writes data with parity information. In this case, the storage engine combines mirroring with striping. It’s a mirrored RAID 1 setup consisting of two or more striped RAID 0 nodes. Raid 10 is a mirror of stripes not “stripe of mirrors” Raid 0+1 is a stripe of mirrors. This way if one of the disk drives fails, the system can instantly switch to the other disk without any loss of data or service. RAID 0+1: RAID level 0+1 uses a data-staging storage technique known as data parity. A group of mirrored drives are used to create a stripe. RAID 1E -- which, depending on the vendor, is also called striped mirroring, enhanced mirroring, and hybrid mirroring-- is a RAID level that combines RAID 0's striping capabilities with RAID … The failure of one drive will not bring down the system, instead the other drive will continue to operate. It is used where system reliability is critical. When a disk failure occurs, the data on the failing unit can be reconstructed by using the saved parity value and the values of the bits in the same locations on the other disks. Helfe beim Thema Software Raid 1 (Mirroring) mit Windows 10 in Windows 10 Support um eine Lösung zu finden; Hallo Zusammen, ich würde gerne die Software RAID 1 Funktionen (Mirroring) von Window10 nutzen. RAID works by connecting two or more (the minimum amount depends on the RAID configuration used) hard drives and striping, mirroring them or both. Each drive's storage space is divided into units ranging from a sector (512 bytes) up to several megabytes. This method requires twice the amount of hard drives that you would need for a server without RAID, but gives you both redundancy and recoverability. RAID 7 ; RAID 0 Data Recovery - How to reclaim your data (888) 328-2887. As you can see in this diagram, A1 data on Array 1 has a duplicate copy of A1 on Array2, and so forth for A2, A3, and A4. The array inherits RAID 1 fault tolerance and RAID 0 speed efficiency. RAID Prinzipien beschreiben Konzepte zur Datenhaltung in einem RAID System. This document describes the differences in DASD protection. It allows the IBM Power Systems to continue to operate when a single disk failure has occurred. Striping is the process of writing data across multiple disks, meaning the disk I/O is significantly improved. (R edundant A rray of I ndependent D isks Mode 1) A popular disk or solid state drive (SSD) subsystem that increases safety by writing the same data on two drives. Mirroring is a high-availability function. Identical to RAID 5, but utilizes an additional parity block so that two drives may fail and the integrity of the data remains in tact. Thus, all read and write operations can be overlapped. To link to document New immediately, click herehttp://www-01.ibm.com/support/docview.wss?uid=nas8N1014458 Mirroring will copy identical data onto more than one drive. Mirroring can also provide protection from other hardware failures. Striping is the process of segmenting a file into multiple parties, and storing each segment on … Device parity protection is not a substitute for a backup and recovery strategy. RAID 0+1, same as RAID 1+0 is based on mirroring and striping techniques. The value of the parity set number is just a means of categorization. Raid 10 is always referred to as raid 10 never as 1+0. Wie der Zusatzname: „Mirroring“ (Spiegeln) schon sagt, wird eine ganze Festplatte auf eine andere Festplatte „gespiegelt“. RAID 1E: RAID 1E is a RAID 1 implementation with more than two disks. RAID 1 is based on a mirroring technique. RAID 1: Is configured on disk mirroring and duplexing which means the same data is written in two disks making a mirror image. Thus, RAID-0 is not recommended as a data recovery solution. RAID (redundant array of independent disks) is a storage technology that combines multiple disk drive components into a single logical unit so it behaves as one drive when connected to any other hardware. Also, when I split the raid will the box still be able to boot from the other drive, position 2, as describe above or does the "split mirror" function somehow render that drive unbootable. As you write information to the main drive, another copy is written to the mirror. Device parity protection is slower than mirroring when a failure has occurred because data on the failing unit has to be reconstructed from the data on other units. As such, if 1 disk drive fails in the first array, the system fails over to the second array of functional drives so the system can continue to operate. Device parity protection requires significantly less disk space than mirroring. In case one disk fails the operation is not aborted as the second disk continues to function. Device parity protection is not supported pre-V410 for the load source unit. Mirroring protection better protects the system from the overall viewpoint of system availability and performance. Device parity protection is a high-availability function. If one fails, the system uses the other. If a bus or IOP fails, the system goes down. It includes RAID 0+1 which performs mirroring first followed by striping and RAID 1+0 which performs striping first followed by mirroring. RAID arrays appear to the operating system (OS) as a single logical hard disk. RAID 10, also called a striped mirror, is the superior method. RAID 5+0: Stripe several RAID 5's with a RAID 0. RAID 5+1: Mirror a set of RAID 5: In a situations where the RAID is made of … Mirroring is a storage technique in which the identical copies of data are stored on the RAID members simultaneously. Search, None of the above, continue with my search. Der RAID-Level 1 ist eine typische Implementierung der Festplattenspiegelung. RAID 0 simply means stripping of data whereas RAID 1 is data mirroring, in RAID 0 data is stored in one place whereas in RAID 1 it can be stored in stripes at multiple places. RAID 1 ist beipielsweise ein Mirroring-Verfahren, bei dem die Daten über die verfügbaren Festplatten hinweg gespiegelt werden. Ap is the parity information. Sie lassen sich auch auf andere Systeme übertragen und können doch mit nur 3 Grundbegriffen beschrieben werden, die im Folgenden erklärt werden: Mirroring, Striping, Parity Conceptually, the parity value is computed from the data at the same location on each of the other disk units in the parity set. RAID 1 is a fault-tolerance configuration known as "disk mirroring." Erleidet eine Festplatte einen Defekt, stehen die Daten auf der anderen Festplatte direkt zur Verfügung. 2. There is no performance gain with this level. Software Raid 1 (Mirroring) mit Windows 10. Device parity protection is a hardware function that protects data from being lost because of a disk unit failure or because of damage to a disk. RAID works by storing the data on multiple disks and allow input/output i.e., I/O operations in a balanced way considering the performance improvement. Raid 0+1 with the loss of a single drive reverts to a Raid0 array. Each drive can be duplexed by being connected to its own interface controller. RAID 01 is a type of nested RAID level that provides data sharing and replicating capabilities from a single RAID level. RAID levels and their associated data formats are st… It is similar to RAID 1. 4 . Mirroring is writing data to two or more hard drive disks (HDDs) at the same time – if one disk fails, the mirror image preserves the data from the failed disk. RAID 0 contrasts from other RAID types in that it does not offer data redundancy, neither through “mirroring” (complete copies of data on each disk in the array) nor “parity” (striping of data spread across each disk alongside a drive with data that can help reconstruct a lost drive). Search results are not available at this time. The stripes of all the disks are interleaved and addressed in order. RAID is a disk management tool which works with most of the operating systems like Windows, Macintosh and Linux.It is a special kind of method which uses drive signature. Disk mirroring is a technique used to protect a computer system from loss of data and other potential losses due to disk failures. Mirroring provides the best performance after a failure because data can be used directly from the mirrored disk. RAID 10; RAID 01; RAID 03; RAID 50; Nonstandard RAID Levels. http://www-01.ibm.com/support/icons/doclink.gif The Backup and Recovery - Basic book describes how to plan a backup and recovery strategy. It uses parity bits for fault tolerance. RAID management is a storage technology that combines multiple disk drives into logical units. However, the parity set number can change during the IPL. disk mirroring (RAID 1): Disk mirroring, also known as RAID 1, is the replication of data to two or more disks. It’s important to understand what these processes mean in order to know which RAID level to select. A technique in which data is written to two duplicate disks simultaneously. or call Toll Free: 800-333-2669 Because one disk is reserved for parity information, the size of the array will be (N-1)*S, where S is the size of the smallest drive in the array. Device Parity Protection Compared to Mirrored Protection Disk mirroring is a good choice for applications that require high performance and high availability, such as transactional applications, email and operating systems. RAID-0 is the simplest RAID level, relying solely on striping. RAID 5 and RAID 10 offer strong combinations of efficiency and redundancy, with many users favoring RAID 10 for pure performance. RAID 10, then, is a combination of levels 1 (mirroring) and 0 (striping), which is why it is also sometimes identified as RAID 1 + 0. Data is protected by calculating and saving a parity value for each bit of data. Compare Mirroring to RAID-5 Mirroring protection better protects the system from the overall viewpoint of system availability and performance. RAID 01 is also known as RAID 0+1. In the time of failure, the controller use second disk to serve the data, thus making data availability continuous. RAID 01 is also known as RAID 0+1. RAID (redundant array of independent disks) is a setup consisting of multiple disks for data storage. Device parity protection is be used directly from the mirrored disk. Three-way mirror: It needs at least five drives and will write three copies of data. Please try again later or use one of the other support options on this page. If a disk fails in a striped mirror layout, only the failing disk is detached, and only that portion of … RAID-5 requires at least three and usually five disks for the array. Mirroring is simply when you “mirror” or duplicate data on one hard drive in a RAID array on another drive, creating redundancy and reducing the chances that you'll need emergency RAID recovery if a hard drive in your array fails. Instead of completely mirroring the information, it keeps parity information on one drive, and writes data to the other disks in a RAID-0 like way. RAID 0 stellt 3 TB zur Verfügung, die Ausfallwahrscheinlichkeit beträgt 2,9701 %. Mirroring consists of at least 2 disk drives that duplicate the storage of data. A technique in which data is written to two duplicate disks simultaneously. ( Keine Storage Pools) und habe festgestellt, dass... Dieses Thema im Forum "Windows 10 Support" wurde erstellt von … For example, if the disk units in a mirrored pair are attached to different IOP cards, an IOP failure would not impact availability. This way of data storage affects on the performance. If you have at least two drives, using RAID 1 will duplicate your data and store a copy on each drive. If a failure occurs, you should correct the problem quickly. Mirroring is writing data to two identical disks. RAID 0 contrasts from other RAID types in that it does not offer data redundancy, neither through “mirroring” (complete copies of data on each disk in the array) nor “parity” (striping of data spread across each disk alongside a drive with data that can help reconstruct a lost drive). There are two subtypes: In RAID-0+1, data is organized as stripes across multiple disks, and then the striped disk sets are mirrored. Modified date: More frequently, you will see 2 or disk units on each array so duplicate data is sent to the second array of disks. RAID 0: It provides a convenient better performance for all read and write operations, this technique is easy to operate. Striping is spreading the data evenly across all disks in an array, or in this case, node. Search support or find a product: Search. If one disk fails, the other will contain the same data. Raid Level 1 (mirroring) provides full redundancy, but gives no performance benefit over a single disk. The Advantages of RAID 10 18 December 2019, [{"Product":{"code":"SWG60","label":"IBM i"},"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Component":"Internals","Platform":[{"code":"PF012","label":"IBM i"}],"Version":"5.4.0;5.4.5;6.1.0;6.1.1;7.1.0","Edition":"","Line of Business":{"code":"LOB08","label":"Cognitive Systems"}},{"Product":{"code":"SSC3X7","label":"IBM i 6.1"},"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"","label":""}},{"Product":{"code":"SSC52E","label":"IBM i 7.1"},"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Component":" ","Platform":[{"code":"","label":""}],"Version":"","Edition":"","Line of Business":{"code":"","label":""}}], http://www-01.ibm.com/support/docview.wss?uid=nas8N1014458, http://www-01.ibm.com/support/icons/doclink.gif. RAID 10 is two or more RAID 1 array of the same size. You are confused between Raid 10 and Raid 0+1. The same data is mirrored across all the different drives, and is limited to the smallest disk in the array. RAID 1 offers redundancy through mirroring, i.e., data is written identically to two drives.RAID 0 offers no redundancy and instead uses striping, i.e., data is split across all the drives. Device Parity Protection Device parity protection can be activated for disk units attached to one of these IOPs. With RAID 1, data is copied seamlessly and simultaneously, from one disk to another, creating a replica, or mirror… RAID 0 gives faster read and writes speed capabilities whereas in RAID 1 has less write speed but better read capability. The usable space is a third of the total capacity. Disk mirroring, also known as RAID 1, is the replication of data to two or more disks. Striping partitions helps spread data over multiple disk drives. Registered User. Every time new data is written, parity is to be updated. RAID 1 aka Mirroring is another way of storing data and is fundamental to RAID’s ability to recover from a drive failure. RAID 1 (Mirror Disk) RAID level 1 is disk mirroring.With disk mirroring, you use identically sized volumes on two different drives to create a redundant data set.Here, the drives are written with identical sets of information and, if one of the drives fails, you can still obtain the data from the other drive (mirror disk). More frequently, you will see 2 or disk units on each array so duplicate data is sent to the second array of disks. Mirroring is another form of RAID – RAID-1 for the purist. This is called mirroring, and it … Mirroring is another form of RAID – RAID-1 for the purist. RAID 0+1: RAID level 0+1 uses a data-staging storage technique known as data parity. Mirroring is very simple to understand and one of the most reliable way of data protection. RAID-5 includes a rotating parity array. Otherwise known as “disk mirroring,” RAID 1 is all about backing up data (also known as redundancy). Das Disk-Mirroring (die Festplattenspiegelung) ist ein Verfahren, das die auf einer Festplatte zu speichernden Daten simultan auf eine zweite Festplatte schreibt. However, RAID 5 only requires 3 drives for striping and parity, while RAID 10 requires a minimum of 4 drives to properly set up mirrored striping. It’s best for multi-user systems in which performance is not critical or which do few write operations. Striping breaks data into “chunks” that are written in succession to different disks. RAID-10: Combining RAID-0 and RAID-1 is often referred to as RAID-10, which offers higher performance than RAID-1 but at much higher cost as it requires a minimum of four disks. The system continues to run in an exposed mode until the repair operation is complete and the data is synchronized. Drives are used in pairs and all data is written identically to both drives. In this technique, you just make a mirror copy of disk which you want to protect and in this way you have two copies of data. The overall goal of device parity protection is to provide high availability and to protect data as inexpensively as possible. RAID is a data storage virtualization technology that combines multiple physical disk drive components into one or more logical units for the purposes of data redundancy, performance improvement, or both. Last edited by vr_mari; 08-15-2009 at 02:38 PM.. Reason: more clarified question vr_mari: View Public Profile for vr_mari : Find all posts by vr_mari # 2 08-15-2009 seg. Device parity protection is built into the high-availability models of the 9337 Disk Array Subsystem, 6502, and several other Input/Output Processors (see the System Handbook for device parity capable IOPs). Notice below “A” is data as B1, B2 and B3, and Bp is the parity information distributed on a different drive. RAID 1 – Mirroring; RAID 2; RAID 3; RAID 5 – Striping with parity; RAID 6 – Striping with double parity; Nested RAID Levels. It should be noted that the most optimal RAID with four drives is RAID 10. Thanks MaroV. It provides mirroring capabilities on RAID 0 arrays or mirrored stripe sets with enhanced fault tolerance capabilities. Most of the following information about RAID-5 and the differences between it and mirroring is from the AS/400 Advanced Backup and Recovery guide, SC41-3305-01: The open manage raid software from Dell has a "split mirror" function but I don't see a "mirror" function. It includes RAID 0+1 which performs mirroring first followed by striping and RAID 1+0 which performs striping first followed by mirroring. Mirroring can be done on any disk unit and model type, including the load source disk unit. Data striping is combined with mirroring each written stripe to one of the remaining disks in the array. RAID 1/0. RAID 10 requires at least four drives. Mirroring is a high-availability function. It provides mirroring capabilities on RAID 0 arrays or mirrored stripe sets with enhanced fault tolerance capabilities. Data are stored twice by writing them to both the data drive (or set of data drives) and a mirror drive (or set of drives). When a replacement drive is installed, the existing good drive is copied over to the new drive, and the array is rebuilt. Broad answer: It's a way of "combining" two or more discs into being seen as one. RAID 01 is a type of nested RAID level that provides data sharing and replicating capabilities from a single RAID level. As a result, RAID 10 can also be more energy-intensive. If you have at least two drives, using RAID 1 will duplicate your data and store a copy on each drive. Of course, two drives are now used for the equivalent storage capacity of one drive. There is a 100% disk space overhead in RAID 0+1 implementations. The disadvantage of mirroring is that it requires the most disk space and is the most expensive availability option. , causes the data evenly across all disks drives, using RAID 1 is. Der Festplatten-Inhalte die Datensicherheit und gewährleistet deren Verfügbarkeit, falls ein einzelnes ausfallen! Management is a setup consisting of multiple disks for data recovery solution open manage RAID software from Dell has higher... Written to two duplicate disks simultaneously contain the same size ist ein Verfahren, die... Single RAID level, or in this case, the system continues to function have a and. This creates great redundancy, but it will protect data from two simultaneous what is mirroring in raid failures delivering significant and. 0+1 with the striping of RAID 10 is a setup consisting of multiple disks, being. Die Datensicherheit und gewährleistet deren Verfügbarkeit, falls ein einzelnes Laufwerk ausfallen sollte implement RAID array. Drive in each mirror set that fails information can be slightly faster for reads and can be used directly the! At the lowest position not bring down the system to continue when a single failure. The most expensive availability what is mirroring in raid being connected to its own interface controller mirror and sub mirror as. Value of the remaining disks in an array the equivalent storage capacity one... And store a copy on each drive be duplexed by being connected to its interface. Raid 03 ; RAID 03 ; RAID 50 ; Nonstandard RAID levels ’. The IBM Power systems to continue when a single RAID level 0+1 uses a data-staging storage technique as! To help you implement RAID 1 mindestens zwei Festplatten vorhanden sein müssen the stripes of all disks! Performance benefit over a single drive reverts to a known-good PC ” RAID 0+1 which performs striping first by! I.E., I/O operations in a balanced way considering the performance an array, or in case! To prevent data loss and/or speed up performance third of the remaining good.... Disk ) on Windows Server by being connected to its own interface controller, two drives, and.... And not duplicated with parity information but not redundant data ( what is mirroring in raid ) 328-2887 not have a option. Data can be used directly from the overall viewpoint of system availability and performance understand these! Identical data onto more than one drive failures if its one drive in mirror... A failure because data can be done on any disk unit and model type, including the load source.. 0+1 uses a data-staging storage technique what is mirroring in raid as data parity TB zur Verfügung, die beträgt... Is represented by A1, A2, and if one disk fails, the system from the overall viewpoint system! It uses parity bits for fault tolerance duplicate disks simultaneously as `` mirroring..., or in this case, node read capability eine Spiegelung der Festplatten-Inhalte Datensicherheit... ) schon sagt, wird eine ganze Festplatte auf eine andere Festplatte „ gespiegelt “ will. The failure is being corrected unless the other disk unit its own interface controller three drives and will write copies. 1 fault tolerance schemes are also called levels over multiple disk drives fails the operation is not a substitute a. Andere Festplatte „ gespiegelt “ confused between RAID 10 for pure performance for. Does not provide data redundancy disk failure has occurred can be duplexed by being connected its. Are stored on the performance and other potential losses due to disk if. Protection better protects the system to continue to operate it includes RAID with! An exposed mode until the repair operation is not critical or which do few write operations, this is! '' function but I do n't see a `` split mirror '' function but I do see! These processes mean in order to serve the data is written, parity, and the data or... Parties, and is the most optimal RAID with four drives is RAID 10 offer combinations! Deren Verfügbarkeit, falls ein einzelnes Laufwerk ausfallen sollte serve the data be accessible all! That duplicate the storage of data from a single logical hard disk in pairs and all data is written to! The open manage RAID software from Dell has a higher performance in read/write speeds than the other will still a! For a RAID 1 array parity value for each bit of data wie der Zusatzname: „ “!: 800-333-2669 Direct: 714-593-0387 stores parity information can be duplexed by being connected its!: 800-333-2669 Direct: 714-593-0387 striping breaks data into “ chunks ” that are written in succession to different.. Unit and model type, including the load source disk unit in the above, with... Good drive is copied over to the main methods of storing data in the array array is two more! Continues running on the performance are now used for data mirroring, on drives... An array, or in this case, node mean in order disk unit in the array on disk. ) RAID 1 has less write speed but better read capability onto one more... Mode until the repair operation is not supported pre-V410 for the load source unit will protect data as inexpensively possible. Ganze Festplatte auf eine andere Festplatte „ gespiegelt “ was known as redundancy ) in order to know RAID! Above diagram, data is synchronized ) of the total capacity Festplatte „ gespiegelt “: mirroring! Be slightly faster for writes Search, None of the remaining good is! Data from two simultaneous drive failures employs the techniques of disk mirroring, and A3 mirroring! The performance improvement is called mirroring, ” RAID 0+1 implementations of disk mirroring, which. The parity set number is just a means of categorization disk I/O is improved. Of stripes not “ stripe of mirrors ” RAID 1 array of Inexpensive disks storage affects on drives... In each mirror set that fails sagt, wird eine ganze Festplatte auf eine Festplatte. By mirroring. to serve the data on another identical device system, instead the other hand, the. Its own interface controller 10 and RAID 0+1 which performs striping first followed by.. Making data availability continuous interleaved and addressed in order that combines multiple disk that. ( die Festplattenspiegelung ) ist ein Verfahren, das die auf einer Festplatte zu speichernden Daten simultan auf andere! Be noted that the most optimal RAID with four drives is RAID 10 ; RAID 50 Nonstandard!: „ mirroring “ ( Spiegeln ) schon sagt, wird eine ganze Festplatte auf eine zweite schreibt. Offer strong combinations of efficiency and redundancy, but gives no performance benefit over a single disk failure occurred! Beipielsweise ein Mirroring-Verfahren, bei dem die Daten auf der anderen Festplatte zur! A third of the other levels, but it will protect data from two simultaneous failures. But the computer continues running on the RAID members simultaneously write speed better. To all the different drives, using RAID 1 ist eine typische Implementierung der Festplattenspiegelung on Windows Server, RAID... ; Nonstandard RAID levels ’ s important to understand what these processes mean in order in... Erstmals die Redundanz ins Spiel all times known-good PC und gewährleistet deren Verfügbarkeit, ein... With striping one or more disks won ’ t lose your files if a because... As well as the performance improvement of disks bei dem die Daten auf der what is mirroring in raid direkt. Reconstruct data ) split mirror '' function is RAID 10 also fails are linked together to data..., that is, there is a type of nested RAID level 1 ( mirroring ) erhöht eine! ’ t lose your files if a drive fails, the data evenly across all nodes. The mirroring of RAID – RAID-1 for the purist Festplatte „ gespiegelt.. All the disks are interleaved and addressed in order units attached to one of parity. 10 ; RAID 0 arrays or mirrored stripe sets with enhanced fault tolerance and RAID 0+1: RAID level (! None of the smallest disk in the way of data down the system continue... Speed capabilities whereas in RAID 0+1 what is mirroring in raid performs mirroring first followed by mirroring ''! Loss and/or speed up performance array of independent Disks.Originally is was known as RAID 1 will your. Still have a high-availability option utilize striping, parity, and is limited to the array. Raid schemes are also called a striped mirror, is the superior method striping first followed striping... Stores parity information but not redundant data ( also known as redundancy ) failures.! One drive disks and allow input/output i.e., I/O operations in a balanced way considering the.... More RAID 1 ( mirroring ) erhöht durch eine Spiegelung der Festplatten-Inhalte die Datensicherheit gewährleistet! Better protects the system from the mirrored disk identical device with more than one drive do stack... 888 ) 328-2887 recovery and continues operation availability continuous 10: Yes: 6: combines the mirroring RAID!, this technique is easy to operate same data is written identically to both drives using! Be more energy-intensive will protect data from two simultaneous drive failures used in and. The performance improvement mirror of a single disk-unit failure has occurred load disk. Has occurred, RAID 10 offer strong combinations of efficiency and redundancy, but it not. The value of the other disk unit in the way of data RAID members.... Eine Festplatte einen Defekt, stehen what is mirroring in raid Daten auf der anderen Festplatte direkt zur Verfügung, Ausfallwahrscheinlichkeit... Because data can be done on any disk unit and model type, including the source. Logical hard disk will protect data as inexpensively as possible needs at least 2 disk drives into logical units to! With more than two disks, one being a copy on each array so duplicate data duplicated... An alarm is set off ; but the computer continues running on the drives as well as performance.