Re: [vserver] Hashify and efficient cross-server copying

From: Gordan Bobic <>
Date: Thu 26 Aug 2010 - 11:25:15 BST
Message-ID: <>

On 08/26/2010 11:14 AM, Jeff Jansen wrote:
> Gordan Bobic<> wrote on 2010-Aug-26:
>> Is there an efficient way to copy hashified data across hosts? e.g.
>> using tar or rsync?
>> I want to have a backup host that I can periodically rsync data to, but
>> would like to avoid having to re-hashify the files at the destination
>> since they will already be hashified at source.
> If you rsync the directory where your vservers all "live" and include the "-H"
> switch, then rsync will create the hard links on the target side.
> Something like:
> rsync -avH --delete --numeric_ids /vservers/ target:/vservers/

Indeed, I thought of that, but my concern is about these then not being
marked COW. Would re-hashifying rectify this correctly or would it
assume that since the files are already hard-linked it is deliberate and
that it should leave them alone? And would this be as cheap in terms of
disk I/O as writing the COW flag to the affected files?

Received on Thu Aug 26 11:25:52 2010

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