pwp@shamash.cdc.com ( HOUFAC) (09/21/89)
Can anyone tell me what an "Extent File System" is (compared to a "normal" Unix System V file system). I see it mentioned in nearly every SGI document but I haven't been able to find and explaination of what the benefits are. Thanks! --Pete Poorman
kipp@warp.sgi.com (Kipp Hickman) (09/22/89)
The Extent File System is SGI's high performance filesystem running under system V. It is faster than the BSD filesystem, and tends to provide contiguous files (up to a certain point). There are man pages that describe it at a certain level...The main thing to know is that it is not the AT&T slow filesystem. kipp hickman silicon graphics inc.
mlj8e@dale.acc.Virginia.EDU (Michael L. Johnson) (09/23/89)
In article <643@odin.SGI.COM> kipp@warp.sgi.com (Kipp Hickman) writes: > >The Extent File System is SGI's high performance filesystem running under >system V. > kipp hickman > silicon graphics inc. Actually, didn't the extent file system come from SUN? (804)-924-8607 Michael L. Johnson mlj8e@virginia.EDU Pharmacology Dept. uunet!virginia!mlj8e Box 448; Univ. of Va. mlj8e@virginia.BITNET Charlottesville, Va. 22908
vjs@rhyolite.wpd.sgi.com (Vernon Schryver) (09/24/89)
In article <685@galen.acc.virginia.edu>, mlj8e@dale.acc.Virginia.EDU (Michael L. Johnson) writes: > > Actually, didn't the extent file system come from SUN? > > (804)-924-8607 Michael L. Johnson > mlj8e@virginia.EDU Pharmacology Dept. > uunet!virginia!mlj8e Box 448; Univ. of Va. > mlj8e@virginia.BITNET Charlottesville, Va. 22908 Such statements as the preceding should not be made over a real return address. You are in danger of receiving a visit from Jack "The Knife", of the Usenet Department of Permanent Corrections for Base Calumnies. Sun had nothing to do with the Silicon Graphics EFS. The file system Sun pushed was NFS, Network File System. Sun runs the Berkeley FFS, or Fast File System, which as Kipp (who should know) says, is somewhat slower than EFS. Of course, anything is faster than the unspeakable, tiny-block-with- jumbled-free-list SV BFS. Vernon Schryver Silicon Graphics vjs@sgi.com
jmb@patton.sgi.com (Jim Barton) (09/25/89)
In article <685@galen.acc.virginia.edu>, mlj8e@dale.acc.Virginia.EDU (Michael L. Johnson) writes: > In article <643@odin.SGI.COM> kipp@warp.sgi.com (Kipp Hickman) writes: > > > >The Extent File System is SGI's high performance filesystem running under > >system V. > > kipp hickman > > silicon graphics inc. > Actually, didn't the extent file system come from SUN? > > > > (804)-924-8607 Michael L. Johnson > mlj8e@virginia.EDU Pharmacology Dept. > uunet!virginia!mlj8e Box 448; Univ. of Va. > mlj8e@virginia.BITNET Charlottesville, Va. 22908 Aw, c'mon, don't insult us. Sun hasn't invented a production filesystem that I know of at anytime - they use the fairly standard BSD FFS code. Mr. Hickman actually invented and wrote the code for the Extent File System himself - I'm sure he would resent the slur. -- Jim Barton Silicon Graphics Computer Systems "UNIX: Live Free Or Die!" jmb@sgi.sgi.com, sgi!jmb@decwrl.dec.com, ...{decwrl,sun}!sgi!jmb
kipp@warp.sgi.com (Kipp Hickman) (09/25/89)
The extent filesystem was written by myself and Don Fong, an ex sgi employee. It has nothing whatsoever to do with SUN, except that it is faster than the filesystem they use. kipp hickman silicon graphics inc.