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Beginner

Bandwidth...utilization issue

We are Copying file(bakup or any other) in Lan Network ...... from pc1 to other location (please refer the attached Diagram)..

My quistion is.. My Link 1  is 100 mb but it's not utilizing it's spped its only using 10 mbps and

gig link utilize 100 mbps ...why this Happens... how can  i solve this issue.

Some traffic is there but  every time it takes same amount of time.

Please help........

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Beginner

I think you are confusing MegaByte(MByte) with Megabit(Mbit).

8Mbit = 1MByte

100Mbit = 12MByte

1000Mbit = 120MByte

at 100Mbit it would take a 300MByte file 25 seconds with no overhead( ~30 sec with basic TCP/IP overhead)

at 1000Mbit it would take a 300MByte file 2.5 seconds with no overhead( ~3.0 sec with basic TCP/IP overhead)

So what you are seeing is correct, and per speed specifications.

Best regards,

Paul

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Hi,

of course link speeds are in bps not Bps.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

View solution in original post

7 REPLIES 7
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Beginner

I think you are confusing MegaByte(MByte) with Megabit(Mbit).

8Mbit = 1MByte

100Mbit = 12MByte

1000Mbit = 120MByte

at 100Mbit it would take a 300MByte file 25 seconds with no overhead( ~30 sec with basic TCP/IP overhead)

at 1000Mbit it would take a 300MByte file 2.5 seconds with no overhead( ~3.0 sec with basic TCP/IP overhead)

So what you are seeing is correct, and per speed specifications.

Best regards,

Paul

View solution in original post

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That Means switch has 100 megabit Links not 100 megabyte.......

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Hi,

of course link speeds are in bps not Bps.

Regards.

Alain

Don't forget to rate helpful posts.

Don't forget to rate helpful posts.

View solution in original post

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thank u .... paul & cadet.

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Hi Paul,

One doubt, could you please tell me how this calculation is done ?

Thanks in advance

Thomas

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VIP Expert

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Posting

Just want to also note, beside hosts normally dealing with bytes/sec and networks bits/second, there are often many layers of overhead between the network's bits/second and what you might see on a host for bytes/seconds.  There's L2 protocol overhead (e.g. Ethernet), L3 protocol overhead (e.g. IP), L4 protocol overhead (e.g. TCP) and even other layers of overhead (e.g. FTP, CIFS, SMB, etc.).

Also, when copying large files between hosts, you can bump into physical limitions of the hosts, such as disk drives might not be able to sustain network high speed (even with modern hosts, it can be issue when you're dealing with gig interfaces).

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thanks for additional information Joseph

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