we want redundant mailservice, colocated with data mirrors in more than
one country, connected via different ISPs, without using a usa or uk
company. outsourcing would be sensible, any recommendations?
the other possibility is install it ourselves. is there such software
in the open source world?
i'm envisioning multiple servers, robust enough to handle communications
outages where some users manage to connect to one server and other users
manage to connect to another server. so each server should be able to
directly and simultaneously serve IMAP clients, keeping the filesystems
in sync on the fly, or as soon as possible. it doesn't seem
particularly complicated in theory, just that it would want to be
implemented on the filesystem level. using rsync wouldn't suffice,
rsync is too much latency, too much overhead, and not multidirectional.
unison has similar and other shortcomings.
it seems entirely simple right upto the part where you try to define
what constitutes a simultaneous update of a single file, and what to do
when it happens. perhaps a .eunifs parameter file might tweak how
things are handled within that portion of the fs. for example, how long
to wait before bothering to pass locally updated data on to the other
servers, or, what user to notify about simultaneous updates and how to
things slightly OT that arguably might make sense to do at the same
time: keep old copies of files for possible user retrieval. maintain
an md5 index of files, and use it to avoid storing or sending data when
an identical file exists (ala Backup-PC).
so but anyway, does it exist already? and if not, any suggestion of who
might be up for implementing, and how to find them?
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!