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Re: Mail clustering

--On April 5, 2007 8:16:21 AM +1000 Craig Sanders <cas@taz.net.au> wrote:

sorry, for brief answers.  in a rush to go to work.

On Wed, Apr 04, 2007 at 07:54:15PM +0200, Michelle Konzack wrote:
> time (today i'd probably use the Gigabyte I-RAM battery-backed ram-disk
> PCI cards for /var/spool/postfix). these boxes also acted as outbound

Whats this?  Link please!

do a google search for "gigabyte i-ram".

it's a PCI card which you can stick up to 4GB of RAM into, and which you
can plug into an IDE interface. it looks to the system just like an IDE
disk. it has a 10-16 hour battery backup built-in, trickle-charged while
the system is up and running.

Actually they're SATA.  They just plug into PCI for power.

currently about $200 AUD with no RAM.

> mail relay, doing spam/virus filtering on both inbound and outbound
> mail.

Price of this?

of what?  the whole system?  it was about 3 or 4 years ago - a) can't
remember, b) not relevant, prices have changed too much.

estimate about $1000 AUD for each MX receiver, and about $5-$10K for the
mail server.

> i used LVS to load-balance the incoming mail so that I had control
> over

I was serching my apt-cache but have nothing found on LVS...  Is there
nothing in Debian?

LVS is a kernel compile option, look for IPVS ("IP Virtual Server").
the ipvsadm and ldirectord programs are packaged for debian, as well as
heartbeat and keepalived etc.

Right this is waht I do too but additional VIRUS/SPAM filtering is
done on a External-Server!  But, if my MX-Round-Robin would work, then
I can put, like you the VIRUS/SPAM-Filtering directly onto the MX.


> you may want to look into setting up a mysql cluster to replicate
> your accounts database - share the load, and good for redundancy.
> alternatively, move your account data into LDAP and run LDAP slaves on
> each of the MX boxes so they have a local copy of the account data.

I use libpam-pgsql amd libnss-pgsql with PostgreSQL 7.4 (will upgrade
to 8.2) for 17.000 users and do not find a bottleneck with it...

should be fine.


craig sanders <cas@taz.net.au>

I do not take drugs -- I am drugs.
		-- Salvador Dali

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