Maciej Jan Broniarz ha scritto:
W dniu 10-04-05 17:45, Mike Jakubik pisze:
You may want to check out carp(4).
http://www.freebsd.org/cgi/man.cgi?query=carp
Thanks. Carp is fine, but I still have to figure out how to
synchronize data on disks or in the database. Usign just carp would
leave me with two separate databases containing only parts of users
input. Is there a soulution similar to drbd+heartbeat on Linux?
Geom_gate looks nice, but I have no idea if it has been used in a
production enviroment.
Just to use exact words, fault toulerancy is not possible with any
FreeBSD/Linux O.S.
F.T. means outage can occur in every moment, but all current operation
will be always completed by other equipments; so there will not be
interrupted/lost operations.
The most you can have is HA (High Availability), that means operations
currently executed on servers which have outage are interrupted, but new
operations will be completed as they will be executed on other equipments.
Carp is fine for HA is you have always both db and file storage always
available.
For DB you can use MySQL replica, cross-replicating local MySQL data
among all servers. Each server will keep its own copy, always up to
date with other servers.
This will make all DB data always available, except data recorded in the
last milliseconds.
About file storage, you must have an external reliable NFS server.
Tonino
All best,
mjb
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