04-17-2008
I think i have told you already in the other thread the concept of PPs and PP size.
The value is freely selectable upon creation of the VOLUME GROUP, not the LUN. However it limits your disk size as well as the total capacity of the Volume Group you create: maximum 1019 PPs per PV (=hdisk device) and maximum 32 PVs per VG.
Since you plan to create only one PV (as you said in the other thread) you should select the PP size so that you are not near the 1019 PPs per PV limit.
Example: If the LUN is, say, 50GB in size you should use a PP size of 256MB or 512MB if no other aspects apply.
This way you will be able to use LUNs of up to roughly 250 (500) GB in size giving you a theoretical total of approx. 8 (16) TB in the VG. This should be enough space to grow into for most practical purposes when right now your VGs data fit into the 50 GB i based my example on.
I hope this helps.
bakunin
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LEARN ABOUT DEBIAN
trafgen
trafgen(8) netsniff-ng-toolkit trafgen(8)
NAME
trafgen - a high-performance zero-copy network packet generator
SYNOPSIS
trafgen [-d|--dev <netdev>][-c|--conf <file>][-J|--jumbo-support] [-x|--interactive][-n|--num <uint>][-r|--rand][-t|--gap <usec>]
[-S|--ring-size <size>][-k|--kernel-pull <usec>][-b|--bind-cpu <cpu>] [-B|--unbind-cpu
<cpu>][-H|--prio-high][-Q|--notouch-irq][-v|--version] [-h|--help]
DESCRIPTION
A high-performance network traffic generator that uses the zero-copy TX_RING for network I/O. For instance, on comodity Gigabit hardware up
to 1,488,095 pps 64 Byte pps have been achieved with trafgen.
OPTIONS
trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0
Use packet configuration trafgen.txf, eth0 as transmission device and CPU0 for binding the process.
OPTIONS
-h|--help
Print help text and lists all options.
-v|--version
Print version.
-d|--dev <netdev>
Device for transmission i.e., eth0.
-c|--conf <conf>
Path to packet configuration file.
-x|--interactive
Start trafgen in interactive mode.
-J|--jumbo-support
Support for 64KB Super Jumbo Frames
-n|--num <uint>
Number of packets to generate before exiting. 0 means forever until SIGINT.
-r|--rand
Randomize packet selection process instead of round-robin.
-t|--gap <uint>
Interpacket gap in microseconds.
-S|--ring-size <size>
Manually set ring size to <size>: mmap space in KB/MB/GB.
-k|--kernel-pull <uint>
Kernel pull from user interval in microseconds. Default value is 10 microseconds.
-b|--bind-cpu <cpu>
Bind to specific CPU (or CPU-range).
-B|--unbind-cpu <cpu>
Forbid to use specific CPU (or CPU-range).
-H|--prio-high
Make this high priority process.
-Q|--notouch-irq
Do not touch IRQ CPU affinity of NIC.
EXAMPLES
Generate traffic defined in trafgen.txf on eth0 using CPU 0
trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0
Generate traffic on eth0 using CPU 0, wait 100 us between packets
trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --gap 100
Generate 100,000 packet on eth0 using CPU 0
trafgen --dev eth0 --conf trafgen.txf --bind-cpu 0 --num 100000
AUTHOR
Written by Daniel Borkmann <daniel@netsniff-ng.org>
DOCUMENTATION
Documentation by Emmanuel Roullit <emmanuel@netsniff-ng.org>
BUGS
Please report bugs to <bugs@netsniff-ng.org>
2012-06-29 trafgen(8)