Re: [Sheflug] how good is rsync linux

["Chris J" <cej [at] xxxxxxxxxxxxxxxx>]

And Lo! The Great Prophet fred dodd uttered these words of wisdom:
> Hi Everyone,
> 
> At work we have been looking for a method of remote backup, over WAN
> link, came up with rsync. however the system uses embeded winxp, after
> some search with google came up with rsyn2nas and cwrsync, client and
> server.
> 
> Q. on the NAS server should we remove windozexp embeded and install
> minimal linux installation and use rsync --daemon ?

I've done a quick google for rsync2nas to get some background about it, but 
google returns two links on a french mailing list :-) So I can't answer in 
full.

rsync between Linux boxes however works very well; we have a duty-standby 
system at work, where rsync is ran out of cron to keep the standyby box 
mostly up-to-date (I can't remember how often it syncs).


> 
> Q what are is the plus side of using linux rsync, than windows ?
> 

[[ see comment above about current search success ]]. Also I have no idea 
how well rsync runs on Win32. 

> Q. if you have say a LARGE file, I have tested using iso image and alter
> the files within, delete or add to the file size, does ALL of the imaged
> file get copied over to the NAS server, or only the changes ?

rsync can copy in various ways; however we use it so it only copies changes 
in data blocks, this keeps bandwidth use down and sync times are thus 
rather quick. You can add various verification options as well.

> 
> Q. if only the changes are sent, does the file get re-builded at the
> server end
> 

rsyncd handles this.

> Q. any one using rsync to backup remote, in real time, say sync each
> hour ?
> 

See first answer :)

> Q. any problems with restore if the client (server) has a fatal crash ?
> 

No idea what rsync does if one end or the other suddenly disapears. Google 
is your friend here I think.

> Q. does anyone have a good string command line for the client, should
> -delete be used, and when -ie mail !!!

man rsync; there's plenty of examples, and what you'll need will depend on 
your requirements. If you're using rsync2nas as well, then there's probably 
other issues involved...(but as I've not ofund owt about it, I can't say 
what they might be :-) ).

Chris...

-- 
\ Chris Johnson                 \ NP: 
 \ cej [at] nightwolf.org.uk          \  
  \ http://cej.nightwolf.org.uk/  \ 
   \ http://redclaw.org.uk/        ~---------------------------------------


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