Windows Vista (codenamed Longhorn) is an operating system by Microsoft for use on personal computers, including home and business desktops, laptops, tablet PCs and. Distributed File System (DFS) is a set of client and server services that allow an organization using Microsoft Windows servers to organize many distributed SMB file. Distributed File System (Microsoft) - Wikipedia. This article is about Microsoft's implementation of DFS. For general discussion of the concept and other implementations, see Distributed file system. Distributed File System (DFS) is a set of client and server services that allow an organization using Microsoft Windows servers to organize many distributed SMB file shares into a distributed file system. ![]() TCP and UDP port numbers (/etc/services) quick reference. Whilst the IP address provides the connection to the correct machine, it cannot distinguish the different.DFS has two components to its service: location transparency (via the namespace component) and redundancy (via the file replication component). Together, these components improve data availability in the face of failure or heavy load by allowing shares in multiple different locations to be logically grouped under one folder, the "DFS root". Microsoft's DFS is referred to interchangeably as 'DFS' and 'Dfs' by Microsoft and is unrelated to the DCE Distributed File System, which held the 'DFS' trademark[1] but was discontinued in 2. It is also called "MS- DFS" or "MSDFS" in some contexts, e. Sambauser space project. Overview[edit]There is no requirement to use the two components of DFS together; it is perfectly possible to use the logical namespace component without using DFS file replication, and it is perfectly possible to use file replication between servers without combining them into one namespace. A DFS root can only exist on a server version of Windows (from Windows NT 4. Open. Solaris[2] (in kernel space) or a computer running Samba (in user space.) The Enterprise and Datacenter Editions of Windows Server can host multiple DFS roots on the same server. Open. Solaris intends on supporting multiple DFS roots in "a future project based on Active Directory (AD) domain- based DFS namespaces".[3]There are two ways of implementing DFS on a server: Standalone DFS namespace - allows for a DFS root that exists only on the local computer, and thus does not use Active Directory. A Standalone DFS can only be accessed on the computer on which it is created. It does not offer any fault tolerance and cannot be linked to any other DFS. ![]() ![]() This is the only option available on Windows NT 4. Server systems. Standalone DFS roots are rarely encountered because of their limited utility. Domain- based DFS namespace - stores the DFS configuration in Active Directory, making the DFS namespace root accessible at. FQDN> \< dfsroot>. The namespace roots can reside on a domain controller or a domain member server. If domain controllers are not used as the namespace root servers, multiple member servers should be used to provide full fault tolerance. DFS namespaces[edit]Traditional file shares, associated with a single server, have SMB paths of the form. SERVER> \< path> \< subpath>. Domain- based DFS file share paths are distinguished by using the domain name in place of the server name, in the form. DOMAIN. NAME> \< dfsroot> \< path>. When a user accesses such a share, either directly or by mapping a drive, their computer will access one of the available servers associated with that share, following rules which can be configured by the network administrator. For example, the default behaviour is that users will access the closest server to them; but this can be overridden to prefer a particular server. If a server fails, the client can select a different server transparently to the user. One major caveat regarding this flexibility is that currently- open files will potentially become unusable, as open files cannot be failed- over. DFS replication[edit]Early versions of DFS used Microsoft's File Replication Service (FRS) which provides basic file replication capability between servers. FRS identifies changed or new files, and copies the latest version of the entire file to all servers. Windows Server 2. R2 introduced "DFS Replication" (DFSR) which improves on FRS by only copying those parts of files which have changed (remote differential compression), by using data compression to reduce network traffic, and by allowing administrators flexible configuration options for limiting network traffic with a customizable schedule. History[edit]The server component of Distributed File System was first introduced as an add- on to Windows NT 4. Server, called "DFS 4. Windows 2. 00. 0 Server. Client- side support is included in Windows NT 4. Windows. Linux kernels 2. SMB client VFS called "cifs" that supports DFS. On Mac OS X DFS is supported natively in Mac OS X 1. Lion") onward.[6]See also[edit]References[edit]External links[edit]. Db. 2 - IBM Data for developers. Champion’s corner. IDUG EMEA 2. 01. 7 in Lisbon. My favorite weeks of the year are IDUG conferences. I was lucky enough to go to my first European IDUG last year, and I … Ember Crooks. DB2 Lead DBA and Delivery Manager. Xtivia. Designs, builds, and manages DB2 databases for multiple clients. Frequent speaker and blogger. IBM Champion and IBM Gold Consultant. Founder and principal author of db. IBM Champion, Information Management, 2. IBM Gold Consultant, 2. DB2. Commerce. Follow Ember on Twitter@ember_crooks.
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