[Dirvish] Is this a dumb idea? rsync without ssh

Petcher, Daniel danielp at audioprecision.com
Thu Mar 6 00:52:48 UTC 2008

My boss just had a good idea: he suggested exporting an NFS share, then
rsync will think it's working locally and not bother with the SSH tunnel.


-----Original Message-----
From: dirvish-bounces at dirvish.org [mailto:dirvish-bounces at dirvish.org] On
Behalf Of Shawn (Red Mop)
Sent: Wednesday, March 05, 2008 3:28 PM
To: Dirvish user and developer mailing list
Subject: Re: [Dirvish] Is this a dumb idea? rsync without ssh

On Wednesday 05 March 2008 03:39:59 pm Petcher, Daniel wrote:
> I greatly appreciate your offer, Keith, but it wouldn't be practical 
> in this situation.
> I need to keep the old machine running 24 x 7 (it's also a Samba file
> server) until the new one is fully operational. The new machine's data 
> array is already a SCSI-attached 3U cage full of SATA-II drives (so I 
> don't really need to borrow another cage.)
> The new machine only uses the motherboard-controlled hard drive for 
> booting and a swap-file, and it only uses the 12 TB drive array (9 TB 
> after its internal RAID-6 controller boosts reliability and 
> performance at the expense of space) for data storage.
> When I started the migration project, I decided that I couldn't afford 
> to bring the old server down long enough to connect & disconnect the 
> SCSI array twice, so I took a couple of spare Gbit NICs and a 
> cross-over cable to connect the hosts. Now I can move my data over a 
> private "network" while the old server continues to serve the LAN's 
> requests. While the data moves in the background, I am also working on 
> configuring the NFS and Samba shares I'll want on the new server. 
> Nobody has complained about the diminished performance of the old 
> server... yet. If they do complain, I'll re-nice the rsync to a lower
priority or something.
> It just chafes me a little that I'm wasting CPU cycles on both sides 
> with encryption when I absolutely trust the security of my link. I 
> suppose I could have asked my rsync question on a more directly 
> rsync-related site, but I didn't want to have to explain Dirvish to those
> -dP

Since you have that crossover link, why not setup rsync to run as a daemon
on the originating server listening only on the crossover network and rsync
that way?  You won't lose any work you've already done, and yet it bypasses
ssh's encryption.  Maye sure you use "chroot", "listen", perhaps "hosts
allow", and when you sync, don't use compression.
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