Re: 30GB file transfers using scp
From: Joshua Goodall (joshua_at_myinternet.com.au)
To: "Petty, Robert" <rpetty@DenverNewspaperAgency.com> Date: Fri, 10 Oct 2003 13:23:48 +1000
On Thursday 02 October 2003 04:10, Petty, Robert wrote:
> We have a 30GB oracle database that is being copied to a server which will
> be our production server when a client application upgrade is complete.
> The file transfers will happen twice a week. The Solaris destination
> servers were locked down using Jass and as such the remote tools (rcp, rsh,
> etc) no longer work. I would like to keep them off but the transfer speeds
> are around 600K/s using scp. Much too slow for the window of opportunity.
I'v seen local data transfer speeds sometimes reported that low for years and
the cause is always, without exception, a mismatch between half and full
duplex on a switched ethernet network.
(Example common situation: a Cisco switchport configured to 100/full and the
server incorrectly autodetecting this as 100/half).
It is possible to modify OpenSSH to negotiate null encryption. This is a Bad
Idea and is Not Recommended. Anyway, on modern hardware the speed of the disk
or network is usually the limiting factor.
-- Joshua Goodall <firstname.lastname@example.org> Solutions Architect / Principal Security Architect myinternet Limited.
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