|
VxFS
The VERITAS File System (or VxFS; called JFS and OnlineJFS in HP-UX) is an extent-based file system. It was originally developed by VERITAS Software. Through an OEM agreement, VxFS is used as the primary filesystem of the HP-UX operating system. With on-line defragmentation and resize support turned on via license, it is known as ''OnlineJFS''. It is also supported on AIX, Linux, Solaris, OpenSolaris, SINIX/Reliant UNIX, UnixWare and SCO OpenServer. VxFS was originally developed for AT&T's Unix System Laboratories. VxFS is packaged as a part of the Veritas Storage Foundation (which also includes Veritas Volume Manager). History According to the vendor, it was the first commercial journaling file system. That claim can be taken in two ways, i.e., the first implementation of a journaling file system in a commercial context, or the first file system available as an unbundled product. Dan Koren is cited as one of the original developers of VxFS. He notes in a mailing list th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Comparison Of File Systems
The following tables compare general and technical information for a number of file systems. General information Metadata All widely used file systems record a last modified time stamp (also known as "mtime"). It is not included in the table. Individual file systems may record additional special types of date and time stamps. For example, the specification of ISO 9660 includes a "File Expiration Date and Time" and a "File Effective Date and Time". Features File capabilities Block capabilities Note that in addition to the below table, block capabilities can be implemented below the file system layer in Linux (Logical Volume Manager (Linux), LVM, , Dm-crypt#cryptsetup, cryptsetup) or Windows (Volume Shadow Copy Service, SECURITY.BIN, SECURITY), etc. Resize capabilities "Online" and "offline" are synonymous with "mounted" and "not mounted". Allocation and layout policies OS support Limits While storage devices usually have their size ex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veritas Storage Foundation
Veritas Storage Foundation (VSF ), previously known as Veritas Foundation Suite, is a computer software product made by Veritas Software that combines Veritas Volume Manager (VxVM) and Veritas File System (VxFS) to provide online-storage management. Symantec Corporation developed and maintained VSF until January 29, 2016, at which point Veritas and Symantec separated. The latest product version, 7.0, was re-branded as "Veritas InfoScale 7.0". Veritas Storage Foundation provides: * Dynamic storage tiering (DST) * Dynamic multipathing (DMP) * RAID support Major releases Veritas Storage Foundation was also packaged in bundles such as Veritas Storage Foundation Veritas Cluster Server, for databases, for Oracle RAC, and Veritas Cluster File System. *Veritas InfoScale Enterprise 7.0, December 2015 *Veritas Storage Foundation 6.0, December 2011 *Veritas Storage Foundation 5.1, December 2009 *Veritas Storage Foundation Basic 4.x and 5.x, February 2007, free version, impose usage ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
HP-UX
HP-UX (from "Hewlett Packard Unix") is a proprietary software, proprietary implementation of the Unix operating system developed by Hewlett Packard Enterprise; current versions support HPE Integrity Servers, based on Intel's Itanium architecture. It is based on Unix System V (initially Unix System III, System III) and first released in 1984. Earlier versions of HP-UX supported the HP Integral PC and HP 9000 Series 200, 300, and 400 computer systems based on the Motorola 68000 series of processors, the HP 9000 Series 500 computers based on HP's proprietary HP FOCUS, FOCUS architecture, and later HP 9000 Series models based on HP's PA-RISC instruction set architecture. HP-UX was the first Unix to offer access-control lists for file access permissions as an alternative to the standard Unix permissions system. HP-UX was also among the first Unix systems to include a built-in logical volume management, logical volume manager. HP has had a long partnership with Veritas Software, a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
VERITAS Software
Veritas Technologies LLC is an American international data management company headquartered in Mountain View, California, Santa Clara, California. The company has its origins in Tolerant Systems, founded in 1983 and later renamed Veritas Software. It specializes in storage management software including the first commercial journaling file system, Veritas File System, VxFS, Veritas Volume Manager, VxVM, Veritas Cluster Server, VCS, the personal/small office backup software Backup Exec and the enterprise backup List of backup software, software, NetBackup. Veritas Record Now was an early CD recording software. Before merging with Symantec (now known as Gen Digital) in 2004, Veritas was listed on the S&P 500 and the NASDAQ-100 under the VRTS ticker symbol. In 2014, Symantec announced that it would demerge its information management business as Veritas Technologies LLC, to focus on security. It was purchased as part of the demerger by the private equity firm The Carlyle Group for $ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defragmentation
In the maintenance of file systems, defragmentation is a process that reduces the degree of fragmentation. It does this by physically organizing the contents of the mass storage device used to store files into the smallest number of contiguous regions (fragments, ''extents''). It also attempts to create larger regions of free space using compaction to impede the return of fragmentation. Defragmentation is advantageous and relevant to file systems on electromechanical disk drives (hard disk drives, floppy disk drives and optical disk media). The movement of the hard drive's read/write heads over different areas of the disk when accessing fragmented files is slower, compared to accessing the entire contents of a non-fragmented file sequentially without moving the read/write heads to seek other fragments. Causes of fragmentation Fragmentation occurs when the file system cannot or will not allocate enough contiguous space to store a complete file as a unit, but instead put ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
JFS (file System)
Journaled File System (JFS) is a 64-bit journaling file system created by IBM. There are versions for AIX, OS/2, eComStation, ArcaOS and Linux operating systems. The latter is available as free software under the terms of the GNU General Public License (GPL). HP-UX has another, different filesystem named JFS that is actually an OEM version of Veritas Software's VxFS. In the AIX operating system, two generations of JFS exist, which are called ''JFS'' (''JFS1'') and ''JFS2'' respectively. IBM's JFS was originally designed for 32-bit systems. JFS2 was designed for 64-bit systems. In other operating systems, such as OS/2 and Linux, only the second generation exists and is called simply ''JFS''. This should not be confused with JFS in AIX that actually refers to JFS1. History IBM introduced JFS with the initial release of AIX version 3.1 in February 1990. This file system, now called ''JFS1 on AIX'', was the premier file system for AIX over the following decade and was ins ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Symantec Operations Readiness Tools
On March 15, 2011, Symantec released Symantec Operations Readiness Tools (SORT), an updated version of Veritas Operations Services (VOS). SORT (formerly VOS) is a web-based suite of services introduced by Symantec Corporation in 2008 that supports Symantec enterprise products, such as Veritas Storage Foundation, Veritas Cluster Server (VCS), and NetBackup. SORT collects environmental data from AIX, HP-UX, Linux, Solaris, and Windows servers. SORT identifies risks in data centers and provides remediation recommendations. Symantec does not currently charge its customers for SORT. Process SORT uses a data collector to collect configuration and environmental data about Veritas Volume Manager (VxVM), Veritas File System (VxFS), VCS, NetBackup, and other Symantec enterprise products. The data are analyzed for potential problems and risks, which are summarized in reports. SORT produces three types of reports about Symantec enterprise products: * Product and licensing inventory ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fork (filesystem)
In a computer file system, a fork is a set of data associated with a file-system object. File systems without forks only allow a single set of data for the contents, while file systems with forks allow multiple such contents. Every non-empty file must have at least one fork, often of default type, and depending on the file system, a file may have one or more other associated forks, which in turn may contain primary data integral to the file, or just metadata. Unlike '' extended attributes'', a similar file system feature which is typically of fixed size, forks can be of variable size, possibly even larger than the file's primary data fork. The size of a file is the sum of the sizes of each fork. Popular file systems that can use forks include Apple's HFS+ and Microsoft's NTFS. Alternatives On file systems without forks, one may instead use multiple separate files that are associated with each other, particularly sidecar files for metadata. However, the connection between these f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Unix System Laboratories
Unix System Laboratories (USL), sometimes written UNIX System Laboratories to follow relevant trademark guidelines of the time, was an American software laboratory and product development company that existed from 1989 through 1993. At first wholly, and then majority, owned by AT&T, it was responsible for the development and maintenance of one of the main branches of the Unix operating system, the UNIX System V Release 4 source code product. Through Univel, a partnership with Novell, it was also responsible for the development and production of the UnixWare packaged operating system for Intel architecture. In addition it developed Tuxedo, a transaction processing monitor, and was responsible for certain products related to the C++ programming language. USL was based in Summit, New Jersey, and its CEOs were Larry Dooling followed by Roel Pieper. Created from earlier AT&T entities, USL was, as industry writer Christopher Negus has observed, the culmination of AT&T's lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Terabyte
The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures. To disambiguate arbitrarily sized bytes from the common 8-bit definition, network protocol documents such as the Internet Protocol () refer to an 8-bit byte as an octet. Those bits in an octet are usually counted with numbering from 0 to 7 or 7 to 0 depending on the bit endianness. The size of the byte has historically been hardware-dependent and no definitive standards existed that mandated the size. Sizes from 1 to 48 bits have been used. The six-bit character code was an often-used implementation in early encoding systems, and computers using six-bit and nine-bit bytes were common in the 1960s. These systems often had memory words of 12, 18, 24, 30, 36, 48, or 60 bits, corresponding ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Veritas Cluster File System
The Veritas Cluster File System (or VxCFS) is a cache coherent POSIX compliant shared file system built based upon VERITAS File System. It is distributed with a built-in Cluster Volume Manager (VxCVM) and components of other VERITAS Storage Foundation products - particularly VERITAS Cluster Server, VERITAS File System, and VERITAS Volume Manager. It uses the underlying mechanisms of VERITAS Cluster Server to manage membership and changes in cluster state. The shared file system is available on the following operating systems: IBM AIX, Solaris, Linux, and HP-UX. The current version of the product is version 7.4.1.{{Cite web, url=https://sort.veritas.com/documents/doc_details/vis/7.3.1/Linux/ProductGuides/, title=InfoScale Storage guides for Linux, documents, download, website=sort.veritas.com, access-date=2017-12-29 Mode of clustering Because of the need to maintain cluster awareness to prevent any data corruption or discrepancies in cache, the clusters are tightly coupled an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
