Re: uplinking slowdown

2000-12-08 Thread jakob krabbe

At 10:42 2000-12-07 -0900, you wrote:
Did the speed decrease happen between the backup switch and the 
basement switch?  or was that within one switch?

I haven't done so much research on this topic since it came so
unexpectedley. I have LOADS of stuff to do so the good old phrase "if it
works don't touch it" could be very appropriet here... I'm a webbprogrammer
and the network guy at the same time.

Take a look at duplexing if you are crossing over the switches.  Make 
sure everything got set to either half or full (one OR the other). 
Be sure that the duplexing between the switches is all the same, full 
duplex them all if you can.

Duplex seems to be an important issue. All our hardware runs at 100 MBit
(one computer excluded).

Is the network fairly quiet when the backup is running (besides the 
backup of course)?
Meaning, is there other traffic while the backup is taking place?  Do 
you have more than one backup machine going across the uplinks?

I would say the network is nothing but quiet! Back-up starts at 10 PM and
used to be finished before I come to work at 7:00.

You have a fairly decent setup, and switches should not be showing 
internal traffic (traffic local to that switch) to the other switches.

In the basement we have the "printhouse section" so during day that part is
fairly bussy. But still, if above is true we have a pretty quite network
all the time!

--

I have just done the uplink. no extra fiddle with software etc. maybe
that's the problem!? :-)

thanx,

/ jakob


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RE: uplinking slowdown

2000-12-07 Thread Thone, Bradley A (Sbcsi)

It could be half-duplex vs full-duplex on the 100Mb connections.

If one switch port is trying to talk at full-duplex, but the other side of
the connection (other switch's port) is trying to talk half-duplex, then
performance drops dramatically.

If the switches are configurable (managed), ensure that both switches are
half-duplex, or both switches are full-duplex.

We've run into this here, but it's been between workstations and switches,
not inter-switch.

Hope this helps.

Brad.

-Original Message-
From: jakob krabbe [mailto:[EMAIL PROTECTED]]
Sent: Thursday, December 07, 2000 1:34 AM
To: retro-talk
Subject: uplinking slowdown



How much speed is wasted when uplinking 100MBit swiches?

He have just expended and the back-up used to be something like 70 MB / min
and now it's down to less than 40 MB / min!

[backup switch] - [main switch] - [basement switch]

The arrows indicates the uplink.

Backup switch is an Asante, the main is a D-Link and the basement switch is
an Intelswitch.

This post is more a network issue rather than Retrospect but I don't know
where to turn and I know there are many networking geeks on this list! :-)

thanx,

/ jakob


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Re: uplinking slowdown

2000-12-07 Thread matt barkdull

Did the speed decrease happen between the backup switch and the 
basement switch?  or was that within one switch?

Take a look at duplexing if you are crossing over the switches.  Make 
sure everything got set to either half or full (one OR the other). 
Be sure that the duplexing between the switches is all the same, full 
duplex them all if you can.

Is the network fairly quiet when the backup is running (besides the 
backup of course)?
Meaning, is there other traffic while the backup is taking place?  Do 
you have more than one backup machine going across the uplinks?

You have a fairly decent setup, and switches should not be showing 
internal traffic (traffic local to that switch) to the other switches.

Hope this helps.


How much speed is wasted when uplinking 100MBit swiches?

He have just expended and the back-up used to be something like 70 MB / min
and now it's down to less than 40 MB / min!

[backup switch] - [main switch] - [basement switch]

The arrows indicates the uplink.

Backup switch is an Asante, the main is a D-Link and the basement switch is
an Intelswitch.

This post is more a network issue rather than Retrospect but I don't know
where to turn and I know there are many networking geeks on this list! :-)

thanx,

/ jakob



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