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Message-ID: <4355E38B.9CA592DE@att.net> 
From: "Steve M. Fabac, Jr." <smfabac@att.net>
Subject: Re: How to convert /tmp to memfs after install
References: <4353316A.84F6D02@att.net> <zTS4f.143$8W.115@newssvr30.news.prodigy.com> <dj12ii$hq0$1@reader2.panix.com> <43547DC0.AFA10117@att.net> <dj2ob6$evg$1@reader2.panix.com> <bf85f.314$8W.269@newssvr30.news.prodigy.com> 
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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