How not to install fibre links between data centres!
Hi Folks,
A couple of years ago we had to replace the core switches between two of our data centres, a simple task for the most part - these new switches would be state of the art Cisco Catalyst units.
The link between the two sites was a dark fibre, with 8Gb bandwidth running full duplex over a redundant cable pair. It was quite a surprise when we started to tidy up the cables to find this - see the attached images.
The cables comprised two male to male cables, with the ends joined with Bluetack. I'm amazed that it worked for so long. - Actually I'm amazed it worked at all!
hi. I am newbie in Unix. I wanted to install Free BSD 5.2.1 to my computer which winXp was already installed. But i couldn't.
I chose Standard. Then it said you are going to use dos style fdisk partitioning. Then a window displayed begining like this.
WARNING: A geometry of 155127/16/63 for... (0 Replies)
Hi,
I have variables like mentioned below and want to separate as mentioned in output.
var1="4 x fibre cards"
var2="2 fibre cards"
var3="6 - fibre cards"
var4="4 x dual-port"
I have variables like this.I want to separate numbers from this and fibre cards from this.
output has to be... (4 Replies)
Hello,
I have two systems that are being prepared to be SAN attached ..
can anyone tell me any specific checks I should perform prior to the cards being installed...
I am aware of firmware / OS level and relevant drivers, is there anything else?
thanks
Chris. (8 Replies)
We will be buying new Xeon E5-based servers for our datacenter and were wondering which Fibre Channel host bus adapters we should select for these. The choices are Emulex or QLogic (8Gb FC HBAs). Anybody have any recommendations on which is the better choice?
Thanks in advance. (1 Reply)
Hi guys,
I've been trying to tackle this issue for days and I'm stumped. Hopefully someone can give more light on what else I can do.
I have a p7 series box, with dual VIOS and 10 lpars and everything was working fine until I had to move the box to another location in the data centre. Ensured... (16 Replies)
Discussion started by: aixkidbee
16 Replies
LEARN ABOUT REDHAT
plipconfig
PLIPCONFIG(8)PLIPCONFIG(8)NAME
plipconfig - fine tune PLIP device parameters
SYNOPSIS
plipconfig interface
plipconfig interface [nibble NN] [trigger NN] [unit NN]
DESCRIPTION
Plipconfig is used to (hopefully) improve PLIP performance by changing the default timing parameters used by the PLIP protocol. Results are
dependent on the parallel port hardware, cable, and the CPU speed of each machine on each end of the PLIP link.
If the single interface argument is given, plipconfig displays the status of the given interface only. Otherwise, it will try to set the
options.
OPTIONS
nibble NN
Sets the nibble wait value in microseconds. Default is 3000.
trigger NN
Sets the trigger wait value in microseconds. Default is 500.
PLIP speed can in some cases be improved by lowering the default values. Values which are too low may cause excess use of CPU, poor inter-
rupt response time resulting in serial ports dropping characters, or in dropping of PLIP packets. Changing the plip MTU can also affect
PLIP speed.
NOTE
If you get no response it is far more likely the irq is wrong and needs setting with ifconfig. The few cases where the default parameters
will be too fast are those using very long cables. Something you should never do as the parallel port is not specified or designed for
driving long cable runs.
SEE ALSO ifconfig(8)BUGS
Non.
AUTHOR
John Paul Morrison, <jmorriso@bogomips.ee.ubc.ca>, <ve7jpm@ve7jpm.ampr.org>
17 February 1995 PLIPCONFIG(8)