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FreeBSD Multimedia

FreeBSD Multimedia Resources List

Links on this page refer to multimedia resources (podcast, vodcast, audio recordings, video recordings, photos) related to FreeBSD or of interest for FreeBSD users.

This list is available as chronological overview, as a tag cloud and via the sources.

This list is also available as RSS feed

If you know any resources not listed here, or notice any dead links, please send details to Edwin Groothuis so that it can be included or updated.

Tag: netbsd

• Andrew Doran from the NetBSD Project
  Source: bsdtalk
  Added: 13 March 2009
  Tags: bsdtalk, interview, netbsd, andrew doran
  Ogg version (22 minutes), MP3 version (10 Mb, 22 minutes)
  

  Interview with Andrew Doran from the NetBSD Project. We talk about the upcoming 5.0 release.

• NetBSD Developer Lubomir Sedlacik
  Source: bsdtalk
  Added: 17 February 2007
  Tags: bsdtalk, interview, netbsd, pkgsrccon, lubomir sedlacik
  Ogg version (13 minutes), MP3 version (7 Mb, 13 minutes)
  

  Interview with NetBSD Developer Lubomir Sedlacik. We talk about pkgsrcCon 2007.

• NetBSD Release Engineer Jeff Rizzo
  Source: bsdtalk
  Added: 03 January 2007
  Tags: bsdtalk, interview, netbsd, jeff rizzo
  Ogg version (15 minutes), MP3 version (7 Mb, 15 minutes)
  

  Interview with NetBSD Release Engineer Jeff Rizzo. We talk about the upcoming 4.0 release.

• Interview with NetBSD Developer Tim Rightnour
  Source: bsdtalk
  Added: 28 September 2006
  Tags: bsdtalk, interview, netbsd, tim rightnour
  Ogg version (15 minutes), MP3 version (7 Mb, 15 minutes)
  

  Interview with NetBSD Developer Tim Rightnour. We talk about NetBSD/prep.

• Interview with NetBSD Developer Jason Thorpe
  Source: bsdtalk
  Added: 13 September 2006
  Tags: bsdtalk, interview, netbsd, jason thorpe
  Ogg version (38 minutes), MP3 version (18 Mb, 38 minutes)
  

  Interview with NetBSD Developer Jason Thorpe

• Sleeping Beauty - NetBSD on Modern laptops
  Source: YouTube bsdconferences channel
  Added: 24 May 2009
  Tags: youtube, presentation, asiabsdcon2008, asiabsdcon, netbsd, laptops, jorg sonnenberger
  Flash (1:20:56)
  

  P9A: Sleeping Beauty - NetBSD on Modern Laptops
  AsiaBSDCon 2008, Jorg Sonnenberger
  clive URL: http://www.youtube.com/watch?v=v9ygBFjGR50

• P5A: Logical Resource Isolation in the NetBSD Kernel
  Source: YouTube bsdconferences channel
  Added: 27 March 2009
  Tags: youtube, presentation, asiabsdcon2008, asiabsdcon, netbsd, kristaps dzonsons
  Flash (56:29)
  

  P5A: Logical Resource Isolation in the NetBSD Kernel
  AsiaBSDCon 2008, Kristaps Dzonsons
  clive URL: http://www.youtube.com/watch?v=c63VneyQI-k

• Kristaps Dzonsons - Process isolation for NetBSD and OpenBSD
  Source: DCBSDCon
  Added: 24 May 2009
  Tags: dcbsdcon, dcbsdcon2009, slides, openbsd, netbsd, process isolation, kristaps dzonsons
  PDF (687 Kb, 27 pages)
  

  In NetBSD and OpenBSD, user-land process and process-context isolation is limited to credential cross-checks, file-system chroot and explicit systrace/kauth applications. I'll demonstrate a working mechanism of isolated process trees in branched OpenBSD-4.4 and NetBSD-5.0-beta kernels where an isolated process is started by a system call similar to fork; following that, the child process and its descendants execute in a context isolated from the caller. This system is the continued work of "mult" -- first prototyped in a branched NetBSD-3.1 kernel and isolating all system resources -- pared down to a lightweight, auditable patch of process-only separation for both OpenBSD and NetBSD. I specifically address solutions to performance issues and mechanism design with an eye toward more resources being isolated in the future.

• EuroBSDCon 2008 - Martin Schuette - Improved NetBSD Syslogd
  Source: EuroBSDCon
  Added: 22 October 2008
  Tags: eurobsdcon, eurobsdcon2008, netbsd, syslogd, martin schuette
  MP3 (1 byte, 42 minutes), OGG (1 byte, 42 minutes), PDF (1 byte, n pages)
  

  Martin Schuette has three main goals, defined by three internet drafts to implement:
  • TLS transport is the most obvious improvement: it provides a reliable network transport with data encryption and peer authentication. To make full use of this a buffering mechanism to bridge temporary network errors is implemented as well.
  • Syslog-protocol extends the message format to use a complete timestamp, include a fully qualified domain name, and allow UTF-8 messages. It also offers a structured data field to unambiguously encode application dependent information.
  • Syslog-sign will allow any syslog sender to digitally sign its messages, so their integrity can be verified later. This enable the detection of loss, deletion or other manipulation syslog data after network transfer or archiving on storage media.
  
  Martin Schuette is a student of computer science in Potsdam, Germany, and has been working as a part-time system administrator for BSD servers since 2004.
  In 2007 Martin Schuette already gave a talk on Syslog at the Chemnitze Linux-Tage (http://chemnitzer.linux-tage.de/2007/vortraege/detail.html?idx=547 in german; for a newer english version see these slides for a seminar talk: http://fara.cs.uni-potsdam.de/~mschuett/uni/syslog-protocols-080522.pdf).

• EuroBSDCon 2008 - Joerg Sonnenberger - Sleeping beauty - NetBSD on Modern Laptops
  Source: EuroBSDCon
  Added: 22 October 2008
  Tags: eurobsdcon, eurobsdcon2008, netbsd, laptops, joerg sonnenberger
  MP3 (1 byte, 54 minutes), OGG (1 byte, 54 minutes), PDF (1 byte, n pages)
  

  This paper discusses the NetBSD Power Management Framework (PMF) and related changes to the kernel. The outlined changes allow NetBSD to support essential functions like suspend-to-RAM on most post-Y2K X86 machines. They are also the fundation for intelligent handling of device activity by enabling devices on-demand. This work is still progressing. Many of the features will be available in the up-coming NetBSD 5.0 release The NetBSD kernel is widely regarded to be one of the cleanest and most portable Operating System kernels available. For various reasons it is also assumed that NetBSD only runs well on older hardware. In the summer of 2006 Charles Hannum, one of the founders of NetBSD, left with a long mail mentioning as important issues the lack of proper power management and suspendto- RAM support. One year later, Jared D. McNeill posted a plan for attacking this issue based on ideas derived from the Windows Driver Model. This plan would evolve into the new NetBSD Power Management Framework (PMF for short).

• EuroBSDCon 2007 Videos
  Source: EuroBSDCon
  Added: 10 October 2007
  Tags: eurobsdcon, eurobsdcon2007, videos
  Soren Straarup - An ARM from shoulder to hand (141 Mb), Pawel Jakub - FreeBSD/ZFS - last word in operating/file systems (203 Mb), Yvan VanHullebus - NETASQ and BSD: a success story (382 Mb), Claudio Jeker - Routing on OpenBSD (394 Mb), Brooks Davis - Using FreeBSD to Promote Open Source Development Methods (92 Mb), Gregers Petersen - Open Source - is it something new? (285 Mb), Antti Kantee - ReFUSE: Userspace FUSE Reimplementation Using puffs (197 Mb), Steven Murdoch - Hot or Not: Fingerprinting hosts through clock skew (235 Mb), Sam Smith - Fighting "Technical fires" (147 Mb), Kirk Mckusick - A Brief History of the BSD Fast Filesystem (251 Mb), George Neville-Neil - Network Protocol Testing in FreeBSD and in General (271 Kb), Robert Watson - FreeBSD Advanced Security Features (200 Mb), Sam Leffler - Long Distance Wireless (for Emerging Regions) (248 Mb), Simon L Nielsen - The FreeBSD Security Officer function (195 Kb), Stephen Borrill - Building products with NetBSD - thin-clients (364 Mb), Pierre Yves Ritschard - Load Balancing (219 Mb), Isaac Levy - FreeBSD jail(8) Overview, the Secure Virtual Server (350 Mb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (376 Mb), John P Hartmann - Real Men's Pipes - When UNIX meets the mainframe mindset (315 Mb)
  

  EuroBSDCon 2007 Papers

• EuroBSDCon 2007 Papers
  Source: EuroBSDCon
  Added: 05 October 2007
  Tags: eurobsdcon, eurobsdcon2007, papers
  Pawel Jakub - FreeBSD/ZFS - last word in operating/file systems (337 Kb), Stephen Borrill - Building products with NetBSD - thin-clients (407 Kb), John P Hartmann - CMS Pipelines Explained (118 Kb), Soren Straarup - An ARM from shoulder to hand (307 Kb), Brooks Davis - Building clusters with FreeBSD (2.2 Mb), Steven Murdoch - Hot or Not: Fingerprinting hosts through clock skew (6.1 Mb), Brooks Davis - Using FreeBSD to Promote Open Source Development Methods (989 Kb), Sam Leffler - Long Distance Wireless (for Emerging Regions) (19 Mb), Antti Kantee - ReFUSE: Userspace FUSE Reimplementation Using puffs (102 Kb), Yvan VanHullebus - NETASQ and BSD: a success story (2.4 Mb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (692 Kb), Pierre Yves Ritschard - Load Balancing (23 Kb), John P Hartmann - Real Men's Pipes - When UNIX meets the mainframe mindset (382 Kb), Claudio Jeker - Routing on OpenBSD (1.3 Mb), Marc Balmer - Supporting Radio Clocks in OpenBSD (304 Kb), Peter Hansteen - Firewalling with OpenBSD's PF packet filter (531 Kb), Simon L Nielsen - The FreeBSD Security Officer function (251 Kb), Robert Watson - FreeBSD Advanced Security Features (152 Kb), Ryan Bickhart - Transparent TCP-to-SCTP Translation Shim Layer (491 Kb), Kirk Mckusick - A Brief History of the BSD Fast Filesystem (145 Kb), George Neville-Neil - Network Protocol Testing in FreeBSD and in General (251 Kb), Sam Smith - Fighting "Technical fires" (1.4 Mb), Marko Zec - Network stack virtualization for FreeBSD 7.0 (401 Kb), Isaac Levy - FreeBSD jail(8) Overview, the Secure Virtual Server (120 Mb)
  

  EuroBSDCon 2007 Papers

• AsiaBSDCon 2008 Paper List
  Source: AsiaBSDCon
  Added: 08 April 2008
  Tags: asiabsdcon, asiabsdcon2008
  Using FreeBSD to Promote Open Source Development Methods, Brooks Davis, Michael AuYeung, Mark Thomas (The Aerospace Corporation) (483 Kb), OpenBSD Network Stack Internals, Claudio Jeker (The OpenBSD Project) (410 Kb), Tracking FreeBSD in a Commercial Setting, M. Warner Losh (Cisco Systems, Inc.) (94 Kb), Send and Receive of File System Protocols: Userspace Approach With puffs, Antti Kantee (Helsinki University of Technology, Finland) (126 Kb), GEOM --- in Infrastructure We Trust, Pawel Jakub Dawidek (The FreeBSD Project) (91 Kb), Reducing Lock Contention in a Multi-Core System, Randall Stewart (Cisco Systems, Inc.) (72 Kb), PC-BSD: FreeBSD on the Desktop, Matt Olander (iXsystems) (6.4 Mb), Logical Resource Isolation in the NetBSD Kernel, Kristaps Dzonsons (Centre for Parallel Computing, Swedish Royal Institute of Technology) (97 Kb), Whole of the proceedings (9.3 Mb), Gaols: Implementing Jails Under the kauth Framework, Christoph Badura (The NetBSD Foundation) (92 Kb), Cover page (467 Kb), Sleeping Beauty --- NetBSD on Modern Laptops, Jorg Sonnenberger, Jared D. McNeill (The NetBSD Foundation) (87 Kb), A Portable iSCSI Initiator, Alistair Crooks (The NetBSD Foundation) (341 Kb), BSD implementations of XCAST6, Yuji IMAI, Takahiro KUROSAWA, Koichi SUZUKI, Eiichi MURAMOTO, Katsuomi HAMAJIMA, Hajimu UMEMOTO, and Nobuo KAWAGUTI (XCAST fan club, Japan) (526 Kb)
  

  Papers of the AsiaBSDCon 2007

• AsiaBSDCon 2007 Paper/Slides List
  Source: AsiaBSDCon
  Added: 17 March 2007
  Tags: asiabsdcon, asiabsdcon2007
  SHISA: The Mobile IPv6/NEMO BS Stack Implementation Current Status, Keiichi Shima (Internet Initiative Japan Inc., Japan), Koshiro Mitsuya, Ryuji Wakikawa (Keio University, Japan), Tsuyoshi Momose (NEC Corporation, Japan), Keisuke Uehara (Keio University, Japan) [paper] (311 Kb), An ISP Perspective, jail(8) Virtual Private Servers, Isaac Levy (NYC*BUG/LESMUUG, USA) [paper] (140 Kb), A NetBSD-based IPv6 NEMO Mobile Router, Jean Lorchat, Koshiro Mitsuya, Romain Kuntz (Keio University, Japan) [paper] (412 Kb), Whole of the Proceedings (6.5 Mb), Cover page (588 Kb), Porting the ZFS File System to the FreeBSD Operating System, Pawel Jakub Dawidek (pjd at FreeBSD.org, Poland) [slides] (278 Kb), Implementation and Evaluation of the Dual Stack Mobile IPv6, Koshiro Mitsuya, Ryuji Wakikawa, Jun Murai (Keio University, Japan) [paper] (1071 Kb), puffs - Pass to Userspace Framework File System, Antti Kantee (Helsinki University of Technology, Finland) [slides] (116 Kb), Reflections on Building a High Performance Computing Cluster Using FreeBSD, Brooks Davis (The Aerospace Corporation/brooks at FreeBSD.org, USA) [paper] (1371 Kb), Nsswitch Development: Nss-modules and libc Separation and Caching, Michael A Bushkov (Southern Federal University/bushman at FreeBSD.org, Russia) [paper] (32 Kb), Bluffs: BSD Logging Updated Fast File System, Stephan Uphoff (Yahoo!, Inc./ups at FreeBSD.org, USA) [slides] (601 Kb), Security Measures in OpenSSH, Damien Miller (djm at openbsd.org, Australia) [paper] (97 Kb), Porting the ZFS File System to the FreeBSD Operating System, Pawel Jakub Dawidek (pjd at FreeBSD.org, Poland) [paper] (96 Kb), An ISP Perspective, jail(8) Virtual Private Servers, Isaac Levy (NYC*BUG/LESMUUG, USA) [slides] (20 Mb), Support for Radio Clocks in OpenBSD, Marc Balmer (mbalmer at openbsd.org, Switzerland) [paper] (86 Kb), How the FreeBSD Project Works, Robert N M Watson (University of Cambridge/rwatson at FreeBSD.org, United Kingdom) [paper] (328 Kb), puffs - Pass to Userspace Framework File System, Antti Kantee (Helsinki University of Technology, Finland) [paper] (68 Kb)
  

  Slides and papers of the AsiaBSDCon 2007

• New York City BSD Con 2008
  Source: New York City *BSD User Group
  Added: 24 November 2008
  Tags: nycbsdcon2008, nycbsdcon, presentation
  Julio M. Merino Vidal: An introduction to the Automated Testing Framework (ATF) for NetBSD. (570 Kb, 18 pages), Mike Silbersack: Detecting TCP regressions with tcpdiff. (88 Kb, 28 pages), Metthew Dillon: The HAMMER File System. (820 Kb, 16 pages), Kurt Miller: OpenBSD's Position Independent Executables (PIE) Implementation. (21 pages), Adrian Chadd: High-throughput concurrent disk IO in FreeBSD. (197 Kb, 92 pages), Anders Magnusson: Design and Implementation of the Portable C Compiler. (123 Kb, 29 pages), Jason L Wright: When Hardware Is Wrong, or "They can Fix It In Software". (1.7 Mb, 22 pages)
  

  Slides of presentations given at New York City BSD Conference 2008.

• New York City BSD Con 2008
  Source: New York City *BSD User Group
  Added: 13 October 2008
  Tags: nycbsdcon2008, nycbsdcon, presentation
  Jeremy C. Reed: Introduction to DNSSEC. (15 Mb), Michael Lucas: Network Refactoring, or doing an oil change at 80 MPH. (10 Mb), Anders Magnusson: Design and Implementation of the Portable C Compiler. (15 Mb), Jason Dixon: BSD versus GPL. (4 Mb), Kurt Miller: OpenBSD's Position Independent Executables (PIE) Implementation. (10 Mb), Metthew Dillon: The HAMMER File System. (14 Mb), Pawel Jakub Dawidek: A closer look at the ZFS file system. (16 Mb), Jason L Wright: When Hardware Is Wrong, or "They can Fix It In Software". (9 Mb), Michael Shalayeff: Porting PCC. (11 Mb), Adrian Chadd: High-throughput concurrent disk IO in FreeBSD. (14 Mb), Mike Silbersack: Detecting TCP regressions with tcpdiff. (11 Mb), Julio M. Merino Vidal: An introduction to the Automated Testing Framework (ATF) for NetBSD. (10 Mb)
  

  Audio recordings of presentations given at New York City BSD Conference 2008. Courtesy of nikolai at fetissov.org. The main page also has links to the slides.

• Amitai Schlair on pkgsrcCon.
  Source: New York City *BSD User Group
  Added: 04 May 2007
  Tags: nycbug, presentation, pkgsrccon, netbsd, amitai schlair
  MP3 version (21Mb)
  

  The fourth annual pkgsrcCon is April 27-29 in Barcelona. As might be expected when brains congregate, pkgsrcCon traditionally results in a flurry of activity toward new directions and initiatives. Mere hours after returning to New York, Amitai will give us a recap of the proceedings, including his presentation, "Packaging djbware."

  Amitai Schlair is a pkgsrc developer who has worked in such diverse areas as Mac OS X platform support and packages of software by Dan Bernstein. His full-time undergraduate studies at Columbia are another contributing factor to his impending insanity. He consults in software and IT.

• New York City BSD Con 2006
  Source: New York City *BSD User Group
  Added: 01 November 2006
  Tags: nycbug, nycbsdcon, nycbsdcon2006, presentation
  Russell Sutherland: BSD on the Edge of the Enterprise. (12 Mb), Bob Beck: spamd - spam deferral daemon. (16 Mb), Bjorn Nelson: A Build System for FreeBSD (9 Mb), Jason Dixon: BSD Is Dying. (5 Mb), Kristaps Johnson: BSD Virtualisation with sysjail. (15 Mb), Bob Beck: PF, it is not just for firewalls anymore. (15 Mb), Jason Wright: OpenBSD on sparc64. (9 Mb), Brian A. Seklecki: A Framework for NetBSD Network Appliances. (10 Mb), Johnny C. Lam: The "hidden dependency" problem. (13 Mb), Corey Benninger: Security with Ruby on Rails in BSD (14 Mb), Wietse Venema: Postfix as a Secure Programming Example. (16 Mb), Marco Peereboom: Bio & Sensors in OpenBSD. (11 Mb)
  

  Audio recordings of presentations given at New York City BSD Conference 2006. Courtesy of nikolai at fetissov.org. The main page also has links to the slides.

• MeetBSD 2007 - Presentations and recordings
  Source: MeetBSD
  Added: 28 May 2008
  Tags: meetbsd, meetbsd2007
  Slawomir Zak - DTrace - Monitoring i strojenie systemu w XXI wieku (546 Mb), Brooks Davis - Reflections on Building a High-Performance Computing Cluster Using FreeBSD (401 Mb), Christian Brüffer - Protecting your Privacy with FreeBSD and Tor (416 Kb, 34 Pages), Rafal Jaworowski - FreeBSD do zabudowy, czyli nie tylko pecety (600 Kb, 21 pages), Dominik Hamera, Jakub Klausa - Nowoczesne rozwiazania bezprzewodowe w systemie FreeBSD (165 Mb), Christian Brüffer - Protecting your Privacy with FreeBSD and Tor (409 Kb), Matt Olander - PC-BSD: FreeBSD on the Desktop (272 Mb), Adam Bartman, Rafal Grzebyk - Nowoczesna infrastruktura telefoniczna w oparciu o systemy z rodziny BSD (105 Mb), Pawel Solyga - Meet BSD projects from Google Summer of Code 2007 (6.0 Mb), Brooks Davis - Reflections on Building a High-Performance Computing Cluster Using FreeBSD (1.7 Mb, 25 Pages), Rafal Jaworowski - FreeBSD do zabudowy, czyli nie tylko pecety (638 Mb), Philip Paeps - Detangling and debugging: friends in unexpected places (162 Mb), Pawel Solyga - Meet BSD projects from Google Summer of Code 2007 (3.7 Mb, 71 Pages), Pawel Solyga - Meet BSD projects from Google Summer of Code 2007 (308 Mb), Adam Bartman, Rafal Grzebyk - Nowoczesna infrastruktura telefoniczna w oparciu o systemy z rodziny BSD (3.9 Mb, 71 Pages), Philip Paeps - Detangling and debugging: friends in unexpected places (495 Kb, 53 Pages), Kris Kennaway - New features and improvements in FreeBSD 7 (336 Kb, 37 pages), Slawomir Zak - DTrace - Monitoring i strojenie systemu w XXI wieku (1.1 Mb, 35 Pages), Kris Kennaway - New features and improvements in FreeBSD 7 (564 Mb)
  

  MeetBSD 2007 at the Conference Centre-PWSBiA Congress in Warsaw

• Julio M. Merino Vidal - ATF: Sistema de pruebas automatizado para NetBSD (234 Kb)
  Source: BSDCon Spain
  Added: 27 May 2008
  Tags: bsdcon-barcelona, spanish, presentation, atf, netbsd, julio m merino vidal
  

  La presentación empezará describiendo la necesidad de poder probar automáticamente la validez del código del sistema operativo NetBSD para así saber que se comporta correctamente en cualquiera de las plataformas soportadas. Luego se explicará cómo se estructura ATF, cómo se integra con NetBSD y se daran ejemplos prácticos de su uso tanto como programador o usuario.

  ATF es un proyecto autocontenido que funciona en multitud de plataformas (y no sólo BSD). Aún así, está centrado en NetBSD y las pruebas automatizadas para este sistema son específicas de él, no del proyecto ATF en sí.

• NetBSD and ssshfs
  Source: Linux and FreeBSD video tutorials. For everyone.
  Added: 03 May 2007
  Tags: unix-tutorial, flash, netbsd, puffs
  

  Usage of ssshfs on NetBSD with PUFFS.

• Install Debian and NetBSD on Xen Domu
  Source: Linux and FreeBSD video tutorials. For everyone.
  Added: 03 May 2007
  Tags: unix-tutorial, flash, netbsd, xen, debian
  

  Video tutorial on installation of Debian and NetBsd on Domu with Xen.

• NetBSD. More CPUs than Linux. + BSD ports/packages.
  Source: Berklix.com Computer Services
  Added: 16 May 2007
  Tags: berklix, netbsd, packages
  

  From the talks with subject "Free Alternatives To Microsoft" comes "NetBSD. More CPUs than Linux. + BSD ports/packages.".

• Stephen Borrill - Building products with NetBSD - thin-clients
  Source: BSDCan - The Technical BSD Conference
  Added: 25 May 2009
  Tags: bsdcan, bsdcan2009, presentation, netbsd, thin client, stephen borrill
  Slides (499 Kb, 60 pages)
  

  Building products with NetBSD - thin-clients
  NetBSD: delivering the goods

  This talk will discuss what thin-clients are, why they are useful and why NetBSD is good choice to build such a device.

  This talk will provide information on some alternatives and the strengths and weaknesses of NetBSD when used in such a device.

  It will discuss problems that needed to be addressed such as how to get a device with rich functionality running from a small amount of flash storage, as well as recent developments in NetBSD that have helped improve the product.

• Joerg Sonnenberger - Journaling FFS with WAPBL
  Source: BSDCan - The Technical BSD Conference
  Added: 25 May 2009
  Tags: bsdcan, bsdcan2009, presentation, netbsd, wapbl, ffs, joerg sonnenberger
  Slides (10 Kb, 24 pages)
  

  Journaling FFS with WAPBL

  NetBSD 5 is the first NetBSD release with a journaling filesystem. This lecture introduces the structure of the Fast File System, the modifications for WAPBL and specific constraints of the implementation.

  The Fast File System (FFS) has been used in the BSD land for more than two decades. The original implementation offered two operational modes:

  • safe and slow (sync)
  • unsafe and fast (async) One decade ago, Kirk McKusick introduced the soft dependency mechanism to offset the performance impact without risk of mortal peril on the first crash. With the advent of Terabyte hard disks, the need for a file system check (fsck) after a crash becomes finally unacceptable. Even a background fsck like supported on FreeBSD consumes lots of CPU time and IO bandwidth.

  Based on a donation from Wasabi Systems, Write Ahead Physical Block Logging (WAPBL) provides journaling for FFS with similar or better performance than soft dependencies during normal operation. Recovery time after crashes depends on the amount of outstanding IO operations and normally takes a few seconds.

  This lecture gives a short overview of FFS and the consistency constraints for meta data updates. It introduces the WAPBL changes, both in terms of the on-disk format and the implementation in NetBSD. Finally the implementation is compared to the design of comparable file systems and specific issues of and plans for the current implementation are discussed.