On Mon, 12 Apr 2010, Troy Dawson wrote:

> Hello,
> We are looking at puting drbd into SL5.  I do not think our packaging is
> ready to go into SL 5.5, but I'd like to have it tested before putting
> it into contrib, and then we'll see whether we want to put it in SL 5.6.
>
> "DRBD is a block device which is designed to build high availability
> clusters. This is done by mirroring a whole block device via (a
> dedicated) network. You could see it as a network raid-1."

I know nothing about DRBD but isn't there already another implementation 
of something very similar (NBD, ENBD etc)?

   http://nbd.sourceforge.net/
   http://www.it.uc3m.es/~ptb/nbd/

I know that some of the cluster vendors were taking the NBD/ENBD code and 
improving it in various ways.  Is this what DRBD is or does it do more 
than md over NBD can?

[ Not that I've used NBD/ENBD either but I've been told that another 
department are using it a lot as part of a backup solution (not that this 
means much to us)... ]


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