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Memory-based filesystems using md(4)
Posted August 1, 2003

(FreeBSD 5)

This makes a 64-megabyte filesystem in swap space, mounted at /cache.

In /usr/local/etc/rc.d/md.sh ...

#!/bin/sh

echo -n ' md '
case "$1" in
  start)
    md=`mdconfig -a -t swap -s 64m`
    newfs "/dev/$md"
    mount /dev/$md /cache
    ;;
  stop)
    u=`mount|egrep '^/dev/md. on /cache'`
    u=${u%% on *}
    u=${u#/dev/md}
    umount /cache
    mdconfig -d -u "$u"
    ;;
esac

To start this automatically at boot time:

chmod +x /usr/local/etc/rc.d/md.sh