[Mimedefang] Email resend

Cliff Hayes chayes at afo.net
Mon Dec 14 18:03:37 EST 2009


It is using /dev/shm per the docs at http://www.mimedefang.org/node/20 which
I think translates to tmpfs if I'm interpreting the df correctly.

So ... should I not specify a size?

Here is the recommended command from the documentation:

/bin/mount -t tmpfs -o size=500m,mode=0700,uid=defang,gid=defang /dev/shm

Here's what I'm using (100m)

/bin/mount -t tmpfs -o size=100m,mode=0700,uid=defang,gid=defang /dev/shm

Here's my df output:

Filesystem           1K-blocks      Used Available Use% Mounted on
                      72791328  10940064  58153600  16% /
/dev/sda1               198337     22590    165507  13% /boot
tmpfs                   986408         0    986408   0% /dev/shm
/dev/shm                102400      3368     99032   4%

-----Original Message-----
From: mimedefang-bounces at lists.roaringpenguin.com
[mailto:mimedefang-bounces at lists.roaringpenguin.com]On Behalf Of Michiel
Sent: Monday, December 14, 2009 3:15 PM
To: mimedefang at lists.roaringpenguin.com
Subject: Re: [Mimedefang] Email resend

Cliff Hayes wrote:
> Thanks for the suggestion :) I set up the ramdisk.
> The recommended 500M size killed my 2G server, so I'm using a 100M size
> I still think that's too big ... seems to be using about 3% of it right
> (df command).
> How do I size the thing?  I can't afford to waste memory (what's new).
> if I make it too small, won't mimedefang crash?
If you are using a tmpfs ramdisk you will not waste memory. The more
data is written the more of your capacity will be used and memory will
be added dynamically (and freed when capacity not used anymore).

Make sure you have the swap to back up incase of memory starvation (ie
so your tmp will not wake up the OOM monster).

Usualy for every 1Mb of tmpfs I add I add 1Mb of swap, nearly never gets
used but diskspace is cheaper than RAM and at high memory usage (the
tmpfs will get swapped out usualy) the "ramdisk" performs slow but will
not crash ur system.

See http://en.wikipedia.org/wiki/Tmpfs for more info on Tmpfs, stay away
from the traditional ramdisks (just eating up ram and all, with no swap

Hope it helps
Michiel Brandenburg
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