Date: Thu, 11 Mar 2004 10:33:50 +0000 From: David Malone <dwmalone@maths.tcd.ie> To: Colin Percival <colin.percival@wadham.ox.ac.uk> Cc: cvs-all@FreeBSD.org Subject: Re: cvs commit: src/sys/sys mdioctl.h src/sys/dev/md md.c src/sbin/mdconfig mdconfig.8 mdconfig.c Message-ID: <20040311103350.GA22684@walton.maths.tcd.ie> In-Reply-To: <6.0.1.1.1.20040311062306.03f9ade0@imap.sfu.ca> References: <20040311044722.GA93643@regency.nsu.ru> <48203.1078985587@critter.freebsd.dk> <6.0.1.1.1.20040311062306.03f9ade0@imap.sfu.ca>
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On Thu, Mar 11, 2004 at 06:30:28AM +0000, Colin Percival wrote: > Is it really necessary for vnode-backed memory disks to be > accessed through the filesystem? Why can't md(4) hijack the > disk blocks which constitute the file There may not even be blocks that constitute the file, if the file is sparse. vnode backed sparse files can be useful for creating and testing large filesystems, if you don't happen to have TB of disk space to hand... David.
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