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- High Availability Linux
- has been around for some time. The principals
were well known to us, and we have done some setups with HA and heartbeat
before. There have been several good articles in major publications
such as the
November 2003 article in Linux Magazine .
- DRBD
- is a newer and less well known technology. I read an article
Data
Redundancy By DRBD in the November 2003 issue of Linux Magazine.
We have configured many Linux mail servers and are familiar with the
components of OpenExchange. It uses Postfix for the MTA and Cyrus
Imap for the MDA and mailstore. OpenLDAP provides authentication.
PostgreSQL stores addressbooks and some other data. Apache webserver
provides the webmail interface along with Jakarta. It uses WebDAV
to with a plug-in for OutLook clients to provide look-alike functionality
of Microsoft Exchange.
The hardware consists of three identical Intel Servers with dual Intel
Xeon 2.4Ghz processors, 2Gb RAM, zero channel raid and 4 36Gb host
swap drives. One machine is a cold backup in case of a catastrophic
hardware failure. The Intel motherboards have dual gigabit ethernet
on-board. We configured the drives as raid-5 with a hot swap spare.
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