I think the problem might be the encryption scp uses in contrast to SMB.
Which most probably explains the speed difference there.
Speed of encryption/decryption in scp also heavily depends on cipher used and
cpu's available (sending/receiving party).
So you could experiment with different ciphers.
Try using RC4 as cipher .. you'll probably see an increase in throughput
example scp -c arcfour
(note - rc4 not so secure ;-) )
Lastly - you might want to experiment with compression in on scp (might
decrease throughput or increase depending on cpu load)
cheers
Kurt
Van: "tim evdbt" <tim.evdbt@xxxxxxxxx>
Aan: justin@xxxxxxx, JBECKSTROM@xxxxxxxxx
Cc: "oracle-l" <oracle-l@xxxxxxxxxxxxx>, "oracle-db-l"
<oracle-db-l@xxxxxxxxxxxxxxxxxxxx>
Verzonden: Vrijdag 3 maart 2017 07:08:01
Onderwerp: Re: Migrating database from Windows to Linux
Jeff,
Please consider first measuring the throughput between the servers using the [
https://iperf.fr/ ;| iPerf3 ] package. Doing so should provide the maximum
bandwidth to be expected on that particular network segment, and if it is
possible to improve that bandwidth somehow, iPerf is a good way to measure.
Also, please consider using the [ https://www.slac.stanford.edu/~abh/bbcp/ ;|
bbcp ] package, pretty much the fastest and most full-featured method of
copying files over TCP.
Hope this helps!
-Tim
On 3/2/17 22:00, Justin Mungal wrote:
It would be interesting to see how fast SCP is between your Linux servers, and
then comparing that speed with transfers from Windows to Linux with an SCP
client (assuming all else is equal). SCP between Linux servers has always
seemed fast to me, while using WinSCP has always seemed slow. I've never had to
migrate large files with WinSCP so I've never put much thought into it. But if
SCP between Linux servers is much faster then you at least know that the issue
is not the SCP protocol itself (although a client may be using a version that
may have something to do with the issue). I agree with Hans; you should give
other clients a shot.
On Thu, Mar 2, 2017 at 1:37 PM, Beckstrom Jeffrey < [
mailto:JBECKSTROM@xxxxxxxxx ;| JBECKSTROM@xxxxxxxxx ] > wrote:
BQ_BEGIN
We are copying our database files and have noticed some strange results.
Copying from Windows to a Linux server using putty (pscp) is orders of
magnitude slower than copying to a samba drive and then moving the files to the
Linux server. Can someone suggest places to look as to why copying directly to
the Linux server is so much slower?
Jeffrey Beckstrom
Lead Database Administrator
Information Technology Department
Greater Cleveland Regional Transit Authority
1240 W. 6th Street
Cleveland, Ohio 44113
BQ_END
