Good Morning Sam, Am 2009-07-01 19:08:44, schrieb Sam Varshavchik: > You might want to double-check your metrics. spamassassin and clam-av, or > any other content scanner for that matter, is very CPU intensive. It > would be very unusual not to notice any load from that.
OK, the inbound is using arround 3 GByte of memory because spamassassin
seems to keep anything in memory, but I can not realy say, the machine
is working hard compared to my NEC 4500MH (Quad-Xeon 550MHz/4GB, SCSI)
> The proxy will need to handle exactly double the sum total of I/O
> bandwidth of the storage servers.
I know, but because the server have four GBit NICs, I use the first one
(with a public IP) to connect courier-imap-proxy to the switch which
goes to the CISCO router and the second NIC (with a private IP) goes to
a second switch to which I connect my "mailbox storage servers", mean,
the REAL courier-imap boxes. Hence, they are not accessibel from the
world except over the proxy.
In effect, the two NICs get only singel traffic...
> It is proxying all TCP traffic.
> Everything that gets sent and received by each storage server goes in and
> out of the proxy server. Every packet sent by the storage server gets
> received and resent by the proxy server. Every packet received by the
> storage server gets received and resent by the proxy server.
Right, but how much CPU power does this need? It seems, that even the
smallest Opteron would be overkill.
OK, the current proxy is only a "Sun Fire X4100 M2" and I like to get
one with a Dual-Power-Supply (I am waiting for the answer of Sun), but
what me scared is the bandwidth...
If the X4100 is nearly idle even if I produce 2 times a bandwidth of
1 Gbit, which is the fscking limit, which CPU power do I need, if I use
a Server with two 10 Gbit interfaces?
> Note that you can scale the proxy servers horizontally the same way
> you're scaling out the storage servers. If a single proxy server can't
> handle the bandwidth, you can just add another with the same
> configuration, and load-balance them in DNS.
Right, but does it make sense to put ten X4100 in parallel instead of
using a singel machien with Dual 10 Gbit interfaces?
The smallest X4100 cost me 800 Euro and if I put 10 in parallel using
Round-Robin, I get a price of 8000 Euro and need a much bigger switch.
Using a bigger machine with 10 GBit interfaces cost me 5200 Euro but
then even here, the CPU would be definitivele idle, and how much memory
does courier-imap-proxy eat?
If I ask Sun for a Dual 10GE machine, with the smallest CPU and 4 GByte
memory and only 3 small Disks in Raid-1 with hotfix, the are thinking I
am under drugs...
Grmpf, those machines are all at least 3U with a bunch of drives...
And of course, the ten X4100 will eat arround 1,4 kW/h and the big one
only 200 W/h.
If you compare this, I could use two 10GE Machines in parallel for
security, because the saved energy give me the possibility.
Note: The price on the Website for such machine is arround
13.400 US$ and it is ONLY for NORMAL customers and
NO ISP's, which get a very huge rebat.
Thanks, Greetings and nice Day/Evening
Michelle Konzack
Systemadministrator
Tamay Dogan Network
Debian GNU/Linux Consultant
--
Linux-User #280138 with the Linux Counter, http://counter.li.org/
##################### Debian GNU/Linux Consultant #####################
<http://www.tamay-dogan.net/> Michelle Konzack
<http://www.can4linux.org/> c/o Vertriebsp. KabelBW
<http://www.flexray4linux.org/> Blumenstrasse 2
Jabber linux4miche...@jabber.ccc.de 77694 Kehl/Germany
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