[Dirvish] A conceptual doubt

Eric Searcy emsearcy at osuosl.org
Wed Jun 4 21:42:50 UTC 2008

On Jun 4, 2008, at 7:06 AM, Leopold Palomo-Avellaneda wrote:

> Hi,
> changing my current configuration using nfs (local) to another one  
> with rsync
> and I have realised that probably I have a missunderstand the dirvish
> program. So, I would like to ask you if I have done a big mistake.
> I have a box (ris) with the /home of my users. I have another box  
> (ulises)
> where I would like to put the backup files. If I mount (nfs) the  
> partition
> from ulises to ris, and I run dirvish in ris, I can do a local  
> backup, as I
> have done.
> But,  but reading again the documentation I have found that, if I  
> want to use
> my transport as ssh, I would need to run dirvish in ulises, not in  
> ris,
> because the server is the box where the backup is stored and the  
> client is
> the box where I take the files from.
> Is this correct? Or can I run dirvish in one box and store the files  
> in
> another box using ssh?

You are correct in your reevaluation of how it works.  Dirvish is  
meant to be used on the backup server (it does `pulls', not `pushes').

The reason you can't push is because Dirvish depends on having  
information about inode numbers for hard-links, which you can't do  
when you're pushing the data elseware.  The only way (I can think of)  
to save the files remotely is what you were doing first: mount the  
remote drive via NFS (NFS preserves inode information).  In theory,  
you're still doing a `pull'---just from one location on the virtual  
filesystem to a second location which happens to be mounted NFS.   
Assuming you can optimize your NFS options and network as was  
discussed in the previous thread, there isn't a reason you can't do  
this.  But if you can toss a few perl scripts on ulises (which is all  
dirvish is, after all) and run them via cron, then you can do a pull  
over rsync.

Eric Searcy
OSU Open Source Lab

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