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Copy-on-write (COW), also called implicit sharing [1] or shadowing, [2] is a resource-management technique [3] used in programming to manage shared data efficiently. Instead of copying data right away when multiple programs use it, the same data is shared between programs until one tries to modify it.
The StorNext Storage Manager is a policy based data management system that can copy, migrate and/or archive data from the StorNext File System into a variety of storage devices in multiple locations. Data can be tiered into disk, a Quantum Lattus object store, a robotic tape library, or even exported into an offline vault.
ext4 (fourth extended filesystem) is a journaling file system for Linux, developed as the successor to ext3.. ext4 was initially a series of backward-compatible extensions to ext3, many of them originally developed by Cluster File Systems for the Lustre file system between 2003 and 2006, meant to extend storage limits and add other performance improvements. [4]
An fsync request commits modified data immediately to stable storage. fsync-heavy workloads (like a database or a virtual machine whose running OS fsyncs frequently) could potentially generate a great deal of redundant write I/O by forcing the file system to repeatedly copy-on-write and flush frequently modified parts of trees to storage.
A program that is configured to use a library can use either static-linking or dynamic-linking.Historically, libraries could only be static. [4] For static-linking (), the library is effectively embedded into the programs executable file, while for dynamic-linking the library can be loaded at runtime from a shared location, such as system files.
It is unethical for a program to store its proprietary data here. (There are other folders dedicated to program data.) [username]\AppData (hidden) This folder stores per-user application data and settings. The folder contains three subfolders: Roaming, Local, and LocalLow. Roaming is for networked based logins for roaming profiles.
The duplicity backup software written in python allows for incremental backups with simple storage backend services like local file system, sftp, Amazon S3 and many others. It utilizes librsync to generate delta data against signatures of the previous file versions, encrypting them using gpg , and storing them on the backend.
Server data (data for services provided by system). /sys: In some Linux distributions, contains a sysfs virtual filesystem, containing information related to hardware and the operating system. On BSD systems, commonly a symlink to the kernel sources in /usr/src/sys. /tmp: A place for temporary files not expected to survive a reboot.