Date: Sun, 11 Mar 2001 13:17:58 -0800 (PST) From: David Wolfskill <david@catwhisker.org> To: current@freebsd.org Subject: swap-backed md-based /tmp to replace mfs-based one Message-ID: <200103112117.f2BLHw561727@bunrab.catwhisker.org>
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During the past week, I've been tracking -STABLE (daily) & -CURRENT (about
2 days out of 3) on a new laptop. (More stuff about that in the recent
-mobile archives, for folks who might have an interest.)
Although I realize that there are significant differences between the
FreeBSD mfs vs. the Sun tmpfs, using an mfs-based, swap-backed /tmp has
generally been working well for me over the last 3 years of using FreeBSD.
(I tend to be generous with swap diskspace allocations, which helps.)
And on this laptop, I have 3 different bootable "root" (& associated /usr)
partitions, so I can run -CURRENT, as well as run either of a couple of
-STABLEs. But since I'm running no more than one at a time, it made sense
to me to have the swap space be common to all three environments, and to
make /tmp be swap-backed.
In -STABLE, I merely stuffed an appropriate entry in /etc/fstab, and It
Just Worked. However, based on the example in the mdconfig man page on
-CURRENT, I get the impression that the process is a little more
involved.
Accordingly, I created the following shell script to accomplish a
similar objective, based upon the above-mentioned example in the
mdconfig man page. At present, I have it sitting in
/usr/local/etc/rc.d, which isn't ideal, but I wanted to find out if
anyone had better approaches for doing this, suggestions for
improvement, or arguments that what I'm trying to do is misguided and
shouldn't be done:
#!/bin/sh
size=512M # Plugged directly in to the mdconfig command,
# so use an expression that's compatible with that.
case "$1" in
start)
# Taken from the mdconfig man page, then lightly hacked:
# To create and mount a 128MByte swap backed filesystem on /tmp:
if [ -x /sbin/mdconfig ]; then
/sbin/mdconfig -a -t swap -s $size -u 10 && \
/sbin/disklabel -r -w md10 auto && \
/sbin/newfs /dev/md10c && \
/sbin/tunefs -n enable /dev/md10c && \
/sbin/mount /dev/md10c /tmp && \
/bin/chmod 1777 /tmp && \
exit 0
fi
;;
stop)
dev=`/sbin/mount | /usr/bin/awk '/ \/tmp / {print $1}'` || exit 1
/sbin/umount /tmp && [ -c $dev ] && /sbin/mdconfig -d -u $dev
exit 0
;;
*)
echo "Usage: `basename $0` {start|stop}" >&2
;;
esac
exit 2
Thanks,
david
--
David H. Wolfskill david@catwhisker.org
As a computing professional, I believe it would be unethical for me to
advise, recommend, or support the use (save possibly for personal
amusement) of any product that is or depends on any Microsoft product.
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