From owner-freebsd-hackers Fri Mar 3 18:48:25 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from mta1.rcsntx.swbell.net (mta1.rcsntx.swbell.net [151.164.30.25]) by hub.freebsd.org (Postfix) with ESMTP id 8313337B75D for ; Fri, 3 Mar 2000 18:48:16 -0800 (PST) (envelope-from jbryant@ppp-207-193-2-159.kscymo.swbell.net) Received: from ppp-207-193-2-159.kscymo.swbell.net ([207.193.2.159]) by mta1.rcsntx.swbell.net (Sun Internet Mail Server sims.3.5.1999.09.16.21.57.p8) with ESMTP id <0FQV00AKKMG5ZI@mta1.rcsntx.swbell.net> for freebsd-hackers@FreeBSD.ORG; Fri, 3 Mar 2000 20:48:12 -0600 (CST) Received: (from jbryant@localhost) by ppp-207-193-2-159.kscymo.swbell.net (8.9.3/8.8.5) id UAA10045; Fri, 03 Mar 2000 20:48:03 -0600 (CST) Date: Fri, 03 Mar 2000 20:47:57 -0600 (CST) From: Jim Bryant Subject: Re: Copy-on-write filesystem In-reply-to: To: rminnich@lanl.gov (Ronald G. Minnich) Cc: freebsd-hackers@FreeBSD.ORG Reply-To: kc5vdj@swbell.net Message-id: <200003040248.UAA10045@ppp-207-193-2-159.kscymo.swbell.net> MIME-version: 1.0 X-Mailer: ELM [version 2.4ME+ PL32 (25)] Content-type: text/plain; charset=US-ASCII Content-transfer-encoding: 7bit X-Windows: R00LZ!@# MS-Winbl0wz DR00LZ!@# X-files: The truth is that the X-Files is fiction X-Republican: The best kind!!! X-Operating-System: FreeBSD 4.0-CURRENT #8: Sat Oct 30 00:56:56 CDT 1999 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG In reply: > On Fri, 3 Mar 2000, Michael Bacarella wrote: > > > Can someone tell me why copy-on-write filesystems would be bad? > > It's a good idea. Peter Braam and I have written a device (called memdev) > for linux (sorry!) that implements a virtual-memory-backed copy-on-write > block device (like the loopback device, but uses anon vm pages for store). > > It's pretty interesting. It's quite fast, and copy-on-write does seem to > work OK for a filesystem. I'm using this thing as one of two pieces of a > new private name space implementation that would also work quite well on > freebsd. Ever experience CDC Cyber NOS? Interesting private-space filesystem with many apps today. jim -- All opinions expressed are mine, if you | "I will not be pushed, stamped, think otherwise, then go jump into turbid | briefed, debriefed, indexed, or radioactive waters and yell WAHOO !!! | numbered!" - #1, "The Prisoner" ------------------------------------------------------------------------------ KC5VDJ - HF to 23cm KC5VDJ@NW0I.#NEKS.KS.USA.NOAM kc5vdj@swbell.net IC-706MkII, IC-T81A, HTX-202, HTX-212, HTX-404, KPC3+, PK-232MBX Grid: EM28px ------------------------------------------------------------------------------ ET has one helluva sense of humor, always anal-probing right-wing schizos! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message