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Non-access stratum (NAS) is a functional layer in the NR, LTE, UMTS and GSM wireless telecom protocol stacks between the core network and user equipment. [1] This layer is used to manage the establishment of communication sessions and for maintaining continuous communications with the user equipment as it moves.
The key difference between direct-attached storage (DAS) and NAS is that DAS is simply an extension to an existing server and is not necessarily networked. As the name suggests, DAS typically is connected via a USB or Thunderbolt enabled cable. NAS is designed as an easy and self-contained solution for sharing files over the network.
Some researchers have made a functional and experimental analysis of several distributed file systems including HDFS, Ceph, Gluster, Lustre and old (1.6.x) version of MooseFS, although this document is from 2013 and a lot of information are outdated (e.g. MooseFS had no HA for Metadata Server at that time).
The crucial difference between NAS and SAN, is that NAS presents and manages file systems to client computers, while SAN provides access at block-addressing (raw) level, leaving it to attaching systems to manage data or file systems within the provided capacity. SAN is commonly associated with Fibre Channel networks.
Server, NAS, workstation, embedded OpenIndiana: Many, based on software developed by Sun Microsystems and many others 2010 OpenSolaris: 2023.04 April 30, 2021: No cost: CDDL: Server, workstation: OpenVMS: DEC (now VSI) 1977 RSX-11M V9.2-3 November 20, 2024: Commercial, no cost for non-commercial use Proprietary: Server, workstation: OpenHarmony
NPO "Scientific centre" (now Sitronics) 1985 Vilnius Basic, BK monitor program HFS: Apple: 1985 System 2.1: Amiga OFS: Metacomco for Commodore: 1985 Amiga OS: GEMDOS: Digital Research: 1985 Atari TOS: NWFS: Novell: 1985 NetWare 286: High Sierra: Ecma International: 1986 MSCDEX for MS-DOS 3.1/3.2 [3] FAT16B: Compaq: 1987 Compaq MS-DOS 3.31 ...
Neonatal withdrawal or neonatal abstinence syndrome (NAS) or neonatal opioid withdrawal syndrome (NOWS) is a drug withdrawal syndrome of infants, caused by the cessation of the administration of drugs which may or may not be licit.
The key difference between DAS and NAS is that DAS storage does not incorporate any network hardware and related operating environment to provide a facility to share storage resources independently of the host so is only available via the host to which the DAS is attached.