[KLUG Members] Server Mirroring

[Rusty Yonkers]

I know that the package that was initially referenced as an example
for mirroring actually intercepts the network traffic prior to it
being written to disk and sends a copy of that to the other server. 
So you are actually mirroring the data pre-write not post-write. 
This works well and the failover works pretty flawlessly.  I set one
up a few years ago for M$ Windows and it worked good.  

--- Adam Tauno WIlliams <adam at morrison-ind.com> wrote:

> > The software I want to mirror is Novell GroupWise.
> > I think I've found a solution. DRBD.
> > This will create a virtual block device that will mirror the data
> between two servers.
> 
> But don't block devices exist below the locking layer?  Most
> engines
> cache data, so if multiple engines are sharing the same block
> devices
> and are not somehow aware of each other your data will probably be
> turned into sticky-paste in short order.
> 
> Replication is not the problem,  replication+concurrency is the
> problem.
> 
> > This is below the file level.
> > This coupled with HeartBeat should do the trick.
> 
> Doesn't groupwise offer some kind of 'forest' technology within
> itself?
> 

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=====
Russell C. Yonkers Jr. 
CNE, MCP, A+, CCNA, Linux+, Server+, Network+ certified
-----------------------------------------
Currently using SuSE 9, Mac OS X, Windows 2000, and WinXP 
And yes I run a network at home with Linux and Windows servers
See my personal website http://www.geocities.com/therustycook
Or my consulting site at http://www.atomicsupergeek.com