Virtual tape library (original) (raw)
가상 테이프 라이브러리(VTL, Virtual Tape Library)란 데이터의 백업 및 복구를 위해 가상화 기술을 이용함으로써 디스크를 마치 테이프처럼 인식하여 데이터를 저장하는 시스템이다. 파일 단위로 데이터를 복구할 수 있고, 보유한 서버 수만큼 디스크를 분할해 테이프 라이브러리처럼 사용할 수 있어 데이터 복구 및 백업 속도가 테이프보다 빠른 것이 특징이다. 저장 매체로 디스크를 활용함으로써 안정성이 높으며 초기 도입비나 운영비도 절감할 수 있다. VTL의 반대말은 PTL로서, 물리적 테이프 라이브러리(Physical Tape Library)라고 한다. 최초의 VTL 솔루션은 1997년 IBM 회사의 VTS(Virtual Tape Server)이다. 현재 사용되는 대부분의 VTL 솔루션은 상대적으로 비용이 저렴한 SAS 또는 SATA 방식의 디스크 어레이를 사용하고 있다.
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| dbo:abstract | Eine Virtual-Tape-Library (VTL) ist ein Speicher auf Basis eines Disk Arrays, der nach außen hin eine Tape-Library emuliert. Dadurch ist es möglich, Backup-To-Disk-Konzepte in bestehende Datensicherungsumgebungen, die in der Regel auf Bandlaufwerken basieren, einzubinden. Eine VTL stellt sich für angeschlossene Computer wie eine oder mehrere Tape-Librarys dar. Die Anzahl der Librarys und darin enthaltener Slots und Bandlaufwerke sind dabei frei konfigurierbar. Virtuelle Bänder können zumeist von der VTL direkt auf „echte“ Bänder geschrieben werden, ohne dass die Backup-Software oder ein Server an diesem Vorgang beteiligt ist. Vorteile ergeben sich insbesondere bei der Sicherung langsamer Rechner (v. a. solche, die nur mit 100 MBit/s an das Netzwerk angeschlossen sind), da Bandlaufwerke in einem solchen Fall mit dem Start-Stopp-Verfahren arbeiten müssen, was das Bandmaterial stark strapaziert (siehe Shoeshine-Problem). (de) Une Virtual Tape Library (VTL, en français : bibliothèque de bandes virtuelles) est un système de stockage informatique incluant un serveur, une grappe de disques et un logiciel capable d'émuler cet espace disque en bandes magnétiques. Une VTL fonctionne sous réseau de stockage Fibre Channel ou TCP/IP et se place à côté du serveur d'applications - avec lequel il communique - mais avant les librairies de stockage par bandes magnétiques. Le VTL vise à compenser les inconvénients du stockage sur bande grâce à une couche intermédiaire en système disque. Une des fonctions rendues possibles par la mise en œuvre de VTL est la déduplication. (fr) A virtual tape library (VTL) is a data storage virtualization technology used typically for backup and recovery purposes. A VTL presents a storage component (usually hard disk storage) as tape libraries or tape drives for use with existing backup software. Virtualizing the disk storage as tape allows integration of VTLs with existing backup software and existing backup and recovery processes and policies. The benefits of such virtualization include storage consolidation and faster data restore processes. For most mainframe data centers, the storage capacity varies, however protecting its business and mission critical data is always vital. Most current VTL solutions use SAS or SATA disk arrays as the primary storage component due to their relatively low cost. The use of array enclosures increases the scalability of the solution by allowing the addition of more disk drives and enclosures to increase the storage capacity. The shift to VTL also eliminates streaming problems that often impair efficiency in tape drives as disk technology does not rely on streaming and can write effectively regardless of data transfer speeds. By backing up data to disks instead of tapes, VTL often increases performance of both backup and recovery operations. Restore processes are found to be faster than backup regardless of implementations. In some cases, the data stored on the VTL's disk array is exported to other media, such as physical tapes, for disaster recovery purposes (scheme called disk-to-disk-to-tape, or D2D2T). Alternatively, most contemporary backup software products introduced also direct usage of the file system storage (especially network-attached storage, accessed through NFS and CIFS protocols over IP networks) not requiring a tape library emulation at all. They also often offer a disk staging feature: moving the data from disk to a physical tape for a long-term storage. While a virtual tape library is very fast, the disk storage within is not designed to be removable, and does not usually involve physically removable external disk drives to be used for data archiving in place of tape. Since the disk storage is always connected to power and data sources and is never physically electrically isolated, it is vulnerable to potential damage and corruption due to nearby building or power grid lightning strikes. (en) 가상 테이프 라이브러리(VTL, Virtual Tape Library)란 데이터의 백업 및 복구를 위해 가상화 기술을 이용함으로써 디스크를 마치 테이프처럼 인식하여 데이터를 저장하는 시스템이다. 파일 단위로 데이터를 복구할 수 있고, 보유한 서버 수만큼 디스크를 분할해 테이프 라이브러리처럼 사용할 수 있어 데이터 복구 및 백업 속도가 테이프보다 빠른 것이 특징이다. 저장 매체로 디스크를 활용함으로써 안정성이 높으며 초기 도입비나 운영비도 절감할 수 있다. VTL의 반대말은 PTL로서, 물리적 테이프 라이브러리(Physical Tape Library)라고 한다. 최초의 VTL 솔루션은 1997년 IBM 회사의 VTS(Virtual Tape Server)이다. 현재 사용되는 대부분의 VTL 솔루션은 상대적으로 비용이 저렴한 SAS 또는 SATA 방식의 디스크 어레이를 사용하고 있다. (ko) Виртуальная ленточная библиотека (ВЛБ, VTL, Virtual tape library) — это технология виртуализации хранения данных, обычно используемая для резервного копирования. При этом различные устройства хранения данных (обычно жесткие диски) представлены как ленточные приводы либо ленточные библиотеки с целью сохранения совместимости с существующими системами резервного копирования. Преимущества ВЛБ перед ленточной библиотекой: * большая скорость сохранения и восстановления данных; * масштабируемость; * невысокая стоимость при небольшом объёме данных; * простота произвольного доступа, в отличие от ленты, где поиск нужного фрагмента требует гораздо больше времени. Недостатки: * Высокая стоимость при большом объеме данных (кроме гибридных систем) Преимуществом дискового накопителя является также то обстоятельство, что запись на дисковый накопитель может вестись с переменной скоростью. Благодаря этому, процесс восстановления данных происходит быстрее, чем резервирование вне зависимости от реализации. Встречаются также системы, в которых реализовано смешанное хранение данных: данные, сохранённые на диске, затем сохраняются на другие накопители, например, на магнитные ленты для дальнейшего длительного хранения и восстановления после сбоя (так называемые D2D2T-системы). (ru) |
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| rdfs:comment | 가상 테이프 라이브러리(VTL, Virtual Tape Library)란 데이터의 백업 및 복구를 위해 가상화 기술을 이용함으로써 디스크를 마치 테이프처럼 인식하여 데이터를 저장하는 시스템이다. 파일 단위로 데이터를 복구할 수 있고, 보유한 서버 수만큼 디스크를 분할해 테이프 라이브러리처럼 사용할 수 있어 데이터 복구 및 백업 속도가 테이프보다 빠른 것이 특징이다. 저장 매체로 디스크를 활용함으로써 안정성이 높으며 초기 도입비나 운영비도 절감할 수 있다. VTL의 반대말은 PTL로서, 물리적 테이프 라이브러리(Physical Tape Library)라고 한다. 최초의 VTL 솔루션은 1997년 IBM 회사의 VTS(Virtual Tape Server)이다. 현재 사용되는 대부분의 VTL 솔루션은 상대적으로 비용이 저렴한 SAS 또는 SATA 방식의 디스크 어레이를 사용하고 있다. (ko) Eine Virtual-Tape-Library (VTL) ist ein Speicher auf Basis eines Disk Arrays, der nach außen hin eine Tape-Library emuliert. Dadurch ist es möglich, Backup-To-Disk-Konzepte in bestehende Datensicherungsumgebungen, die in der Regel auf Bandlaufwerken basieren, einzubinden. Vorteile ergeben sich insbesondere bei der Sicherung langsamer Rechner (v. a. solche, die nur mit 100 MBit/s an das Netzwerk angeschlossen sind), da Bandlaufwerke in einem solchen Fall mit dem Start-Stopp-Verfahren arbeiten müssen, was das Bandmaterial stark strapaziert (siehe Shoeshine-Problem). (de) Une Virtual Tape Library (VTL, en français : bibliothèque de bandes virtuelles) est un système de stockage informatique incluant un serveur, une grappe de disques et un logiciel capable d'émuler cet espace disque en bandes magnétiques. (fr) A virtual tape library (VTL) is a data storage virtualization technology used typically for backup and recovery purposes. A VTL presents a storage component (usually hard disk storage) as tape libraries or tape drives for use with existing backup software. Most current VTL solutions use SAS or SATA disk arrays as the primary storage component due to their relatively low cost. The use of array enclosures increases the scalability of the solution by allowing the addition of more disk drives and enclosures to increase the storage capacity. (en) Виртуальная ленточная библиотека (ВЛБ, VTL, Virtual tape library) — это технология виртуализации хранения данных, обычно используемая для резервного копирования. При этом различные устройства хранения данных (обычно жесткие диски) представлены как ленточные приводы либо ленточные библиотеки с целью сохранения совместимости с существующими системами резервного копирования. Преимущества ВЛБ перед ленточной библиотекой: Недостатки: * Высокая стоимость при большом объеме данных (кроме гибридных систем) (ru) |
| rdfs:label | Virtual-Tape-Library (de) Virtual Tape Library (fr) 가상 테이프 라이브러리 (ko) Виртуальная ленточная библиотека (ru) Virtual tape library (en) |
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