directory replication between two servers

[Arthur van Leeuwen]

On Wed, 3 Jul 2002, Eric Ziegast wrote:

> > I am two Linux servers with rsync server running on both. Now I am
> > replicating directories in both servers with the command rsync -avz ....
> > My requirement is, if I made any changs in the first server, say server
> > A,   I want to see the changes in the scond server immediately....some
> > thing similar to mysql database replication....how can I do that..??
> 
> ... a vague question.  It depends on the application.
> 
> If you need read-write access on one server and need to replicate data
> to a read-only server and need synchronous operation (i.e.: the
> write must be completed on the remote server before returning to the
> local server), then you need operating-system-level or storage-level
> replication products.
> 
>     Veritas:
>     Andrew File System (AFS)
>     Distributed File System (DFS)
>     NetApp, Procom (et.al.):
>     EMC, Compaq, Hitachi (et.al.):

> If others know of other replication methods or distributed filesystem
> work, feel free to chime in.

Well, for Linux there's DRBD and NBD as well. NBD is the Network Block Device,
which allows you to export blockdevices over a network. Using this together 
with software-RAID you can build a replication-system. DRBD is the
Distributed Replicated Block Device which provides block devices replicated
over the network.

Doei, Arthur.

-- 
+- Arthur van Leeuwen, Systems Consultant, arthurvl at xos.nl -+
|  X/OS Experts in Open Systems BV                          |
|  Kruislaan 419                     Phone: +31 20 6938364  |
|  1098 VA  Amsterdam                Fax:   +31 20 6948204  |