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RE: Remote NAS via FTP
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Its not only the speed but also the latency that determines and something
c=
alled window size that will determine your max throughput.
=20
Essentially TCP/IP will only send a certain amount of data (window size)
be=
fore it will wait for the acknowledgement from the far end. Whilst almost
n=
egligble on the LAN .. on a WAN the latency quickly starts to become a
fact=
or. With a single connection (i.e. single FTP transfer) between 2
broadban=
d links that may well be a limiting factor.
=20
Its possible to calculate if you know the various OS (to assume default
TCP=
window size) what latency will equal what throughput.
=20
e.g.
https://www.switch.ch/network/tools/tcp_throughput/
=20
80ms might equate to only about 1.1 Mbits/sec =3D 175 Kbytes/sec (Windows
f=
ile transfer often reports in =E2=80=9CBytes/Sec=E2=80=9D not
=E2=80=9Cbits=
/sec)
=20
One end being on a proper low latency fat pipe (i.e. a Data Centre) and
mul=
tiple parallel transfers will negate the effect in most cases.
=20
Regards
Dean
=20
From: ukha_d@xxxxxxx [mailto:ukha_d@xxxxxxx]=20
Sent: 29 August 2014 11:33
To: ukha_d@xxxxxxx
Subject: [ukha_d] Remote NAS via FTP
=20
=20=20
HI, I'm getting a bit frustrated trying to do what appears a relatively
si=
mple operation - ie site a NAS at a mate's house and use it as an offsite
b=
ackup using FTP and filesync. I have hit a number of bumps in the road -
o=
ne is the date and time returned by the FTP server on the synology NAS
(and=
Drobo) differs from that in the filelist - so every remote file has to be =
recopied to catch up on the correct date - this wouldn't be such an issue
i=
f the speed was decent but I'm only getting a few hundred K upload even
tho=
ugh my upload speed is >5Megs and the download speed at the remote site
is =
40Megs - anyone got any ideas as to why it would be so slow?
=20
I am getting a bit fed up and am planning a potential PLAN B - get an old
f=
ire safe, drill a hole in it for power and ethernet site it in my shed and
=
run cat5 to it. Should cover almost all eventualtites.
Cheers
=20
Tim.
=20
=20=20
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<!-- **begin egp html banner** -->
<br><br>
<!-- **end egp html banner** -->
<div class=3DWordSection1><p class=3DMsoNormal><span
style=3D'font-size:11.=
0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:E=
N-US'>Its not only the speed but also the latency that determines and
somet=
hing called window size that will determine your max
throughput.<o:p></o:p>=
</span></p><p class=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family=
:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><o:p>&nbs=
p;</o:p></span></p><p class=3DMsoNormal><span
style=3D'font-size:11.0pt;fon=
t-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>E=
ssentially TCP/IP will only send a certain amount of data (window size)
bef=
ore it will wait for the acknowledgement from the far end. Whilst almost
ne=
gligble on the LAN .. on a WAN the latency quickly starts to become a
facto=
r. With a single connection (i.e. single FTP transfer) =C2=A0between 2
broa=
dband links that may well be a limiting
factor.<o:p></o:p></span></p><p cla=
ss=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri","sans-=
serif";color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></=
p><p class=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri=
","sans-serif";color:#1F497D;mso-fareast-language:EN-US'>Its
possible to ca=
lculate if you know the various OS (to assume default TCP window size)
what=
latency will equal what
throughput.<o:p></o:p></span></p><p
class=3DMsoNor=
mal><span
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";colo=
r:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p
class=
=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";color:#1F497D;mso-fareast-language:EN-US'>e.g.<o:p></o:p></span></p><p=
class=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri","s=
ans-serif";color:#1F497D;mso-fareast-language:EN-US'><a
href=3D"https://www=
.switch.ch/network/tools/tcp_throughput/">https://www.switch.ch/network/too=
ls/tcp_throughput/</a></span><span
style=3D'font-size:11.0pt;font-family:"C=
alibri","sans-serif";mso-fareast-language:EN-US'><o:p></o:p></span></p><p
c=
lass=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri","san=
s-serif";mso-fareast-language:EN-US'><o:p> </o:p></span></p><p
class=
=3DMsoNormal><span
style=3D'font-size:11.0pt;font-family:"Calibri","sans-se=
rif";mso-fareast-language:EN-US'>80ms might equate to only about
1.1 Mbits/=
sec =3D 175 Kbytes/sec (Windows file transfer often reports in
=E2=80=9CByt=
es/Sec=E2=80=9D not =E2=80=9Cbits/sec)<span
style=3D'color:#1F497D'><o:p></=
o:p></span></span></p><p
class=3DMsoNormal><span style=3D'font-size:11.0pt;=
font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US=
'><o:p> </o:p></span></p><p
class=3DMsoNormal><span style=3D'font-size=
:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-langua=
ge:EN-US'>One end being on a proper low latency fat pipe (i.e. a Data
Centr=
e) and multiple parallel transfers will negate the effect in most
cases.<o:=
p></o:p></span></p><p class=3DMsoNormal><span
style=3D'font-size:11.0pt;fon=
t-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:EN-US'><=
o:p> </o:p></span></p><p
class=3DMsoNormal><span style=3D'font-size:11=
.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-language:=
EN-US'>Regards<o:p></o:p></span></p><p
class=3DMsoNormal><span style=3D'fon=
t-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-fareast-=
language:EN-US'>Dean<o:p></o:p></span></p><p
class=3DMsoNormal><span style=
=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D;mso-f=
areast-language:EN-US'><o:p> </o:p></span></p><div><div
style=3D'borde=
r:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p
class=
=3DMsoNormal><b><span lang=3DEN-US
style=3D'font-size:11.0pt;font-family:"C=
alibri","sans-serif"'>From:</span></b><span
lang=3DEN-US style=3D'font-size=
:11.0pt;font-family:"Calibri","sans-serif"'>
ukha_d@xxxxxxx [mailto=
:ukha_d@xxxxxxx] <br><b>Sent:</b> 29 August 2014
11:33<br><b>To:</b=
> ukha_d@xxxxxxx<br><b>Subject:</b> [ukha_d] Remote
NAS via FTP<o:p=
></o:p></span></p></div></div><p
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal> <o:p></o:p></p><div
id=3Dygrp-mlmsg><div id=3Dygrp=
-msg><div id=3Dygrp-text><p>HI, I'm getting a bit
frustrated trying t=
o do what appears a relatively simple operation - ie site a NAS at a
mate's=
house and use it as an offsite backup using FTP and filesync. I
have=
hit a number of bumps in the road - one is the date and time returned by t=
he FTP server on the synology NAS (and Drobo) differs from that in the
file=
list - so every remote file has to be recopied to catch up on the correct
d=
ate - this wouldn't be such an issue if the speed was decent but I'm only
g=
etting a few hundred K upload even though my upload speed is >5Megs
and =
the download speed at the remote site is 40Megs - anyone got any ideas as
t=
o why it would be so
slow?<o:p></o:p></p><p><o:p> </o:p></p><p>I
am ge=
tting a bit fed up and am planning a potential PLAN B - get an old fire
saf=
e, drill a hole in it for power and ethernet site it in my shed and run
cat=
5 to it. Should cover almost all
eventualtites.<o:p></o:p></p><p><br>=
<br><o:p></o:p></p><p>Cheers<o:p></o:p></p><p><o:p> </o:p></p><p>Tim.<=
o:p></o:p></p><p><o:p> </o:p></p><p> <o:p></o:p></p></div><=
div><p class=3DMsoNormal><span
style=3D'color:white'><o:p></o:p></span></p>=
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