Date: Tue, 14 Aug 2001 12:20:03 -0400 From: "Robert J. Adams" <radams@siscom.net> To: "Mike Meyer" <mwm@mired.org>, "Andrew J Caines" <A.J.Caines@halplant.com> Cc: <freebsd-hackers@freebsd.org> Subject: Re: Large /dev/md0 ramdisk Message-ID: <01f801c124df$1bd02fa0$3102fbd1@jason> References: <078a01c12466$345dc830$7215fbd1@jason><20010814011705.D67874@hal9000.servehttp.com> <15225.5907.82100.155925@guru.mired.org>
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Mike, Any ideas on the size limitation I'm hitting with the -stable md? Thanks, jason ----- Original Message ----- From: "Mike Meyer" <mwm@mired.org> To: "Andrew J Caines" <A.J.Caines@halplant.com> Cc: "Robert J. Adams" <radams@siscom.net>; <freebsd-hackers@freebsd.org> Sent: Tuesday, August 14, 2001 8:18 AM Subject: Re: Large /dev/md0 ramdisk > Andrew J Caines <A.J.Caines@halplant.com> types: > > > From what I've read, md is a better way of going than mfs. > > I have seen several references to md being preferred to mfs but have been > > unable to find any detailed comparison or evaluation. To what reference > > were you referring? > > md and mfs have two different behaviors. md uses real memory. mfs uses > buffer space, which is backed by disk. Which is better depends on what > you need it for. > > > I've also seen it suggested that mfs is to go away, leaving only md. For > > happy mfs users like myself who enjoy the convenience of a simple flexible > > fstab entry sufficing for memory backed non-persistent filesystems, that > > is of some concern. > > md has been replaced/upgraded in -current, and now includes the > functionality of both mfs and vn. If I understand things correctly, > the new md implementation of mfs will perform better than mfs. > > There has been talk of a "make and mount" command for md that would > work like mount_md, but it doesn't appear to have materialized > yet. There are also patches floating around for /etc/rc that let you > set a couple of things in /etc/rc.conf to get your md file system set > up at boot. > > <mike > -- > Mike Meyer <mwm@mired.org> http://www.mired.org/home/mwm/ > Independent WWW/Perforce/FreeBSD/Unix consultant, email for more information. > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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