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Reverted 1 edit by 71.213.117.104; Rv, banned users may not edit. (TW) |
my name is gaylynn mitchell, I have never been banned -- you can call my cell phone -- stop removing good editing and putting tags back into articles that need work. Thanks. |
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| introduction_date =
| introduction_os =
| partition_id = 0x64 (2.x), 0x65 (3.X-6.X)
| directory_struct = 32 bit Mirrored FAT
| file_struct = 64K Indexed Block
| bad_blocks_struct = Hotfixing
| max_file_size = 4 [[Gibibyte|GiB]] x 64K
| max_files_no = 4 Billion
| max_filename_size = 256 bytes
| max_volume_size =
| dates_recorded =
| date_range =
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| attributes =
| file_system_permissions =
| compression = Yes (Shannon Fano)
| encryption = Yes
| OS = [[Novell NetWare]],[[Linux]],[[Windows]]
}}
'''NetWare File System''' ('''NWFS''') is a [[file system]], based on a heavily-modified version of [[File Allocation Table|FAT]]. It was used in the [[Novell NetWare]] [[operating system]]. It is the default and only file system for all volumes in versions 2.x through 4.x, and the default and only file system for the SYS volume continuing through version 5.x. There were two varieties of NWFS: 16-bit NWFS 286, used in NetWare 2.x; and 32-bit NWFS 386, used in NetWare 3.x through NetWare 6.x. It was superseded by the release of [[Novell Storage Services]] (NSS) in 1998.▼
▲'''NetWare File System''' ('''NWFS''') is a [[file system]], based on a heavily-modified version of [[File Allocation Table|FAT]]. It was used in the [[Novell NetWare]] [[operating system]]. It is the default and only file system for all volumes in versions 2.x through 4.x, and the default and only file system for the SYS volume continuing through version 5.x. There were two varieties of NWFS: 16-bit NWFS 286, used in NetWare 2.x; and 32-bit NWFS 386, used in NetWare 3.x through NetWare 6.x. It was superseded by the release of [[Novell Storage Services]] (NSS) in 1998.
* Maximum file size: 4GB▼
The Netware File System uses a 32 bit File Allocation Table scheme similar to the MSDOS file system with several improvements including block suballocation, sparse files by the use of block indexes in the fat tables, and mirrored fat and directory files. The NetWare file system also employed a 4 way cylinder aligned segment table to record volume disk segments should a drive spindle fail allowing recovery. NSS subsequently integrated many of the robust features of the NetWare File system into its design including mirroring and hotfixing. The Open Source NetWare File System was designed by Jeff Merkey and Darren Major.
* Maximum volume size: 1TB▼
* Maximum files per volume: 2 million when using a single name space.▼
The NetWare file system was the first storage architecture to employ sector remapping for failed drive sectors called drive hotfixing which would redirect sector mapping to a reserved area of the device. Later Disk Drive manufactuters employed the same technique internally within the drive logic to perform a similar function transparently to the host operating system.
* Maximum files per server: 16 million▼
* Maximum directory entries: 16 million▼
== Open Source NetWare File System ==
In 1999 the Open Source NetWare File System was released on Linux and Windows. The NWFS on-disk format for NetWare 3.x, 4,x, and 5.x was developed and then publicly released on Linux in 1999 and 2000 by former Novell Chief Scientist Jeff Merkey and Darren Major from the Timpanogas Research Group. The specifications for 32-bit NWFS was never published by Novell but the open source version published disclosed the actual specifications for NWFS:
* Directory Record Size: 128 bytes (DOS), 3 x 128 (LONGNAME), 3 x 128 (UNIX), 2 x 128 (MAC)
* Maximum volumes per server: 64
* Maximum volumes per partition: 8
* Maximum open files per server: 100,000
* Maximum directory tree depth:
* Characters used: ASCII double-byte, [[UTF8]]
* Maximum [[Metadata_(computing)|extended attributes]]: 16
* Maximum [[Fork (filesystem)|data streams]]: 10
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Transparent file compression was also supported, although this had a significant impact on the performance of file serving.
Every name space requires its own separate directory entry for each file.
16-bit NWFS could handle volumes of up to 256MB. However, its only name space support was a dedicated [[Application programming interface|API]] to handle Macintosh clients.
== See also ==
{{Portal|Free software}}
* [[List of file systems]]
* [[Comparison of file systems]]
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* [http://www.novell.com/documentation/nw51/index.html?page=/documentation/nw51/nss__enu/data/hn0r5fzo.html Comparison of NW file systems]
* [http://www.novell.com/documentation/nw51/nss__enu/data/h5grftdf.html Another specification comparison page]
* [http://nwfs.googlecode.com Open Source NetWare File System]
{{Compu-storage-stub}}
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