Re: How to convert /tmp to memfs after install

From: Steve M. Fabac, Jr. (smfabac_at_att.net)
Date: 10/18/05

  • Next message: Steve M. Fabac, Jr.: "Re: How to convert /tmp to memfs after install" 
    Date: Tue, 18 Oct 2005 04:44:49 GMT

    third@whasup.com wrote:
    >
    > As per Bob Bailin (72027.3605@compuserve.com):
    >
    > >
    > > "Steve M. Fabac, Jr." <smfabac@att.net> wrote in message
    > > news:4353316A.84F6D02@att.net...
    > > >I am installing Openserver 6.0 for the first time on my test system
    > > > and blew through the file system configuration during installation
    > > > so that /tmp is on the root file system.
    > > >
    > > > I have searched the documentation without finding a solution on
    > > > how to set up /etc/vfstab to create and mount /tmp as memfs
    > > >
    > > > How do I do that without resorting to a re-installation?
    > >
    > > Agreed.
    > >
    > > man mount_memfs
    > > is not much help. It implies that you should be able to issue:
    > >
    > > mount -F memfs /tmp
    > >
    > > in order to create a memory filesystem that replaces the
    > > contents of /tmp, using the maximum value from the memory
    > > pool, but all you get is:
    > >
    > > UX:mount: ERROR: cannot determine special device
    > >
    > > (no special device is required, because it's a memfs!)
    > >
    > > Bob
    >
    > Regarding the "mount" command, try:
    >
    > /etc/fscmd.d/memfs/mount memfs MOUNT_POINT

    Wow, that sort-a-works:
    # /etc/fscmd.d/memfs/mount memfs /tmp
    # df
    / (/dev/root ): 2786668 blocks 179698 i-nodes
    /stand (/dev/boot ): 63478 blocks 10218 i-nodes
    /proc (/proc ): 0 blocks 9839 i-nodes
    /dev/fd (/dev/fd ): 0 blocks 0 i-nodes
    /dev/_tcp (/dev/_tcp ): 0 blocks 0 i-nodes
    /u (/dev/u ): 11872616 blocks 765972 i-nodes
    /app1 (/dev/app1 ): 15650076 blocks 1009671 i-nodes
    /system/processor (/processorfs ): 0 blocks 0 i-nodes
    > /tmp (memfs ): 3607960 blocks 32766 i-nodes

    # dfspace
    / : Disk space: 1360.67 MB of 3000.99 MB available (45.34%).
    /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: 1760.45 MB of 1997.94 MB available (88.11%).

    Looks like it grabbed all available memory to create almost 2G memfs

    But since the system only has 1G of RAM, the above result is suspicious.

    Ok, that's more information (/etc/fscmd.d/memfs/mount memfs MOUNT_POINT)
    than I was able to dig from the SCO DOC's but does not duplicate the
    /tmp memfs created upon install if the option is checked during ISL.

    >
    > -3- 

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