Date: Fri, 19 Jul 1996 09:39:14 -0400 (EDT) From: "Stephen F. Combs" <combssf@salem.ge.com> To: Amancio Hasty <hasty@rah.star-gate.com> Cc: davidg@Root.COM, Heo Sung Gwan <heo@cslsun10.sogang.ac.kr>, freebsd-hackers@FreeBSD.org Subject: Re: your mail Message-ID: <Pine.SUN.3.94.960719093530.5173P-100000@combs.salem.ge.com> In-Reply-To: <199607191258.FAA00407@rah.star-gate.com>
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I didn't notice the original post, but Sybase uses RAW disk i/o as the preferred method for accessing database files (the files are just raw disk partitions, owned by the 'sybase' user). The 'sybase' user is a normal user, no special priv. This is under both SunO/S and HP-UX, don't know about other unixes. Under Windows N/T it just uses regular files (NT doesn't know about raw partitions!). ---- Stephen F. Combs Internet: CombsSF@Salem.GE.COM GE Industrial Systems Voice: 540.387.8828 Network Services Home: CombsSF-Home@Salem.GE.COM 1501 Roanoke Blvd FAX: 540.387.7106 Salem, VA 24153 LapTop: CombsSF-Mobile@Salem.GE.COM On Fri, 19 Jul 1996, Amancio Hasty wrote: > Date: Fri, 19 Jul 1996 05:58:14 -0700 > From: Amancio Hasty <hasty@rah.star-gate.com> > To: davidg@Root.COM > Cc: Heo Sung Gwan <heo@cslsun10.sogang.ac.kr>, freebsd-hackers@FreeBSD.org > > >From The Desk Of David Greenman : > > > 4) How can user process access the file in ufs filesystem through raw disk? > > > > You can't unless you write a user-mode UFS/FFS that does it's I/O through > > the raw device. I couldn't imagine why you'd want to do this, however. > > > > My guess is that his assumption is that accessing the files via a > "raw disk mode" will be faster than going thru the normal file > access mechanism. I wish I knew what is he up to so we can help him or > better yet his justification for taking such approach . > > Amancio > > > >
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