My experience tells me that the resource is not going to the POP3 clients
but it goes to the MTA, antivirus, antispam.
The biggest setup I had was 15K users with postfix + rav + dbmail all on
E220 (2x450 US, 1,5 GB ram and 10K disks), and it would be on it's
knees during spam/dictionary attack, but otherwise it does not have too much
load.
I would personally off-load MTA, antivirus and antispam to something
like Ironport
and use very speedy disks setup (i.e no raid5).
Use raw device for your DB if you can and put your data and index on
different
spindles (maybe put some tables on different spindles too).
Paul, with one master and many slaves option, is there a way to separate
writes
and reads in dbmail? E.g. all writes to the master and all reads from
the slaves
(with RR DNS and HB)?
just my 2 cents
Ming-Wei
Fatemeh Taj wrote:
Here again I appriciate any idea about dbmail hardware estimation.
Regards
Fatemeh Taj
----- Forwarded Message ----
From: Fatemeh Taj <[EMAIL PROTECTED]>
To: DBMail mailinglist <[email protected]>
Sent: Saturday, October 7, 2006 3:58:38 PM
Subject: Re: [Dbmail] DBmail in large scale
Thanks for your idea. If I use master-slave, how would be the scalibility ?
They run a hosting service and will have more and more email subscribers[maybe
1 million at the end of second year] .Also I don't want to have service
interruption for a part of users if a server fails. I will have quad 64 bit
servers in backend. I assume that 50 % of users are active users and 12%
concurrency for them. Does it makes sense for a hosting service provider? If
yes, how can I estimate the hardware?
Thanks in advanced
Fatemeh Taj
----- Original Message ----
From: Paul J Stevens <[EMAIL PROTECTED]>
To: DBMail mailinglist <[email protected]>
Sent: Thursday, October 5, 2006 7:35:55 PM
Subject: Re: [Dbmail] DBmail in large scale
Fatemeh Taj wrote:
Dear All
I would like to know if dbmail could be used for large scale email
environment. I know it is scalable as it uses mysql cluster. I am
going to install it on redhat linux AS4. As I know mysql cluster
loads the database engine in memory, now with 100,000 users which
will have a maximum size of mailbox store , how mysql cluster can
handle the load? What do you suggest for such scale?
Why are you using nbd-cluster instead of a simple master-slave setup?
Use a master-slave setup on fast iron hardware. With 100.000 users the
main metric is the query load generated by the active users, and the
total size of the email store.
My second
question is that if it is possible to use Oracle as the backend
database.
Someone did a oracle driver for dbmail-1, but that tree hasn't been
updated since 2.0.0 afaik.
Writing a new driver (or updating the existing one) is not that much
work. I'd be happy to do so ($$$), as would Aaron I guess.
