always copy the whole file?

[AndyWu]

Thanks for your help.
The linux.iso is 640MB.
I guess you indicate this thread, "[RFC] dynamic checksum size".
I must review the whole archive again, since most files > 8GB in my case.


I'm trying to add some realtime replication funciton to rsync.
I also found that someone did it with the changedfiles package(http://freshmeat.net/projects/changedfiles/).
My idea is to use the netlink socket plus a module to replace sys_close.

Any help/comment/pointer would be appreciated.


Andy

-----Original Message-----
From: rsync-bounces+andywu=iei.com.tw at lists.samba.org [mailto:rsync-bounces+andywu=iei.com.tw at lists.samba.org]On Behalf Of jw schultz
Sent: Monday, August 04, 2003 11:20 AM
To: rsync mailing list
Subject: Re: always copy the whole file?


On Mon, Aug 04, 2003 at 10:55:55AM +0800, AndyWu wrote:
> Here's how it works in my 2 computers.
> 
> First, on auk2
> # rsync -a auk1::pub/linux.iso .
> It takes about 4 minutes. Everything is fine.
> 
> However, after doing this on auk1,
> # echo "hello" >> /pub/linux.iso
> 
> Then, on auk2
> # rsync -a auk1::pub/linux.iso .
> 
> The execution time of the first command is still 4 minutes.
> I think it's supposed to be much shorter than the first case?
> The same results appear in local rsync, too.
> Is there anything wrong with my commands?

Unlikely.

I'll bet that file is several hundred megabytes.  Rsync has
been known that have some difficulty with checksum
collisions on files that large.  If you run with -vv i'll
bet it will report "redoing linux.iso(0)" or something very
similar.

With released versions of rsync this is avoidable to some
degree with the --block-size option.  At one time someone
produced a list of suitable block/file sizes.  Search the
archives if this matters to you.  This problem has already
been addressed in CVS.

-- 
________________________________________________________________
	J.W. Schultz            Pegasystems Technologies
	email address:		jw at pegasys.ws

		Remember Cernan and Schmitt
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