Re: How to convert /tmp to memfs after install

From: Steve M. Fabac, Jr. (smfabac_at_att.net)
Date: 10/19/05

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    Date: Wed, 19 Oct 2005 06:11:24 GMT

    Bob Bailin wrote:
    >
    > <third@whasup.com> wrote in message news:dj2ob6$evg$1@reader2.panix.com...
    >
    > [...]
    >
    > > Try this one:
    > >
    > > mount -F memfs -o swapmax=SIZE_IN_BYTES /dev/mem MOUNT_POINT
    >
    > "/dev/mem": a crucial bit of info left out of the man page.
    >
    > After first mistyping the 'swapmax' option as 'swapmem', I see that
    > /etc/mount is a script that calls the appropriate mount binary, in this case
    > for memfs it's 'mount.svr5':
    >
    > # mount -F memfs -o swapmem=64000 /dev/mem /tmp
    > UX:memfs mount.svr5: ERROR: illegal option: swapmem=64000
    > UX:memfs mount.svr5: TO FIX: Usage:
    > mount.svr5 [-F memfs] [generic_options] [-r] [-o {swapmax=xx | global_swapmax=xx
    > }, rootmode=xx] special mount_point
    >
    > Does 'special' have to be /dev/mem, or is this parameter ignored?
    > According to this test:
    >
    > # mount -F memfs -o swapmax=64000 /dev/tty /tmp
    > # df -v
    > Mount Dir Filesystem blocks used free %used
    > / /dev/root 5426356 3993352 1433004 74%
    > /stand /dev/boot 81918 12806 69112 16%
    > /proc /proc 0 0 0 -
    > /dev/fd /dev/fd 0 0 0 -
    > /dev/_tcp /dev/_tcp 0 0 0 -
    > /system/pr /processorfs 0 0 0 -
    > /tmp /dev/tty 128 0 128 0%
    >
    > it seems to be ignored. Therefore, the /etc/mount script should be
    > modified to supply a dummy '/dev/mem' argument when -F is memfs,
    > if only to avoid bogus filesystem entries in df -v listings.
    >
    > Bob

    With the above items as examples, I added the following to /etc/default/filesys:

    bdev=/dev/mem mountdir=/tmp mount=yes fstyp=memfs \
            rcmount=yes fsck=no rcfsck=no mntopts=global_swapmax=120000000
    bdev=/dev/mem mountdir=/var/tmp mount=yes fstyp=memfs \
            rcmount=yes fsck=no rcfsck=no mntopts=

    And after rebooting I see:
    # dfspace
    / : Disk space: 1344.51 MB of 3000.99 MB available (44.80%).
    /stand : Disk space: 30.99 MB of 39.99 MB available (77.49%).
    /u : Disk space: 5797.17 MB of 6000.99 MB available (96.60%).
    /app1 : Disk space: 7641.63 MB of 8137.82 MB available (93.90%).
    /tmp : Disk space: 114.43 MB of 114.44 MB available (100.00%).
    /var/tmp : Disk space: 114.43 MB of 114.44 MB available (100.00%).

    Total Disk Space: 15043.19 MB of 17408.70 MB available (86.41%).
    # df -i
    Mount Dir Filesystem iused ifree itotal %iused
    / /dev/root 180123 177565 357688 51%
    /stand /dev/boot 22 10218 10240 1%
    /proc /proc 71 9830 9901 1%
    /dev/fd /dev/fd 9 0 9 100%
    /dev/_tcp /dev/_tcp 0 0 0 -
    /u /dev/u 4 765972 765976 1%
    /app1 /dev/app1 89 1009671 1009760 1%
    /system/pr /processorfs 3 0 3 100%
    /tmp /dev/mem 4 32764 32768 1%
    /var/tmp /dev/mem 2 32766 32768 1%

    So, 120M memfs for /tmp is probably excessive but, Hey, I got 1G
    total RAM on a test system. The next time I have to install a
    6.0 Enterprise system, I will record the settings from
    /etc/default/filesys after enabling /tmp memfs in the ISL
    configuration screen. 

    --
                                      Steve Fabac
                                       S.M. Fabac & Associates
                                        816/765-1670
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