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13%

30.11.2025

Home » Archive » 2012 » Issue 08: FreeNAS »

of read requests issued to the device per second. w/s : Number of write requests issued to the device per second. rMB/s : Number of megabytes read from the device per second. wMB/s : Number

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Enterprise communication with IRC

30.11.2025

Home » Archive » 2012 » Issue 10: Traff... »

; 12 13 /* sendq: servers need a higher sendq as they send more data */ 14 sendq=2 megabytes; 15 }; Additionally, ircd.conf lacks a block that allows connections to other servers ... Running an IRC server might seem almost anachronistic, but the classic service from the early 1990s offers a huge amount of functionality with very little in the line of resources. In the daily grind

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Beyond monitoring: Mathematical load simulation in Perl

30.11.2025

Home » Archive » 2011 » Issue 6: Perfor... »

Model"; 11 $work = "ebiz-tx"; 12 $node1 = "WebServer"; 13 $node2 = "AppServer"; 14 $node3 = "DBMServer"; 15 $think = 0.0 * 1e-3; # as per test system 16 $dtime = 2.2 * 1e-3; # dummy service time 17 18

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An IT nomad's daily diary

30.11.2025

Home » Archive » 2011 » Issue 6: Perfor... »

\ 02 --hostname=foo.bar.de --mac- address=00:40:26:CA:10:DD \ 03 --kopts="stage=test app=www" --ksmeta="stage=test app=www" 04 # cobbler system edit --name=foo --interface=eth0 --mac=00:40:26:CA

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Tracing applications with OProfile and SystemTap

30.11.2025

Home » Archive » 2010 » Issue 1: System... »

686 oprofile-0.9.5-4.fc12.i686 To profile the kernel, you need to tell OProfile where the kernel image is located with the --vmlinux option: opcontrol --setup --vmlinux=/usr/lib/debug/lib/ modules

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ARP cache poisoning and packet sniffing

30.11.2025

Home » Archive » 2011 » Issue 6: Perfor... »

Destination MAC address Listing 1 Nemesis arp Packets 01 $ while true 02 > do 03 > sudo nemesis arp -v -r -d eth0 -S 192.168.1.2 -D 192.168.1.133 -h 00:22:6E:71:04:BB -m 00:0C:29:B2

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RAM revealed

30.11.2025

Home » Archive » 2011 » Issue 6: Perfor... »

GKF8S 16 DDR3, Registered, ECC, 4 rank 8.710 0.54 AL24M72E4BKH9S 8 DDR3, Registered, ECC, 2 rank 6.132 0.77 AL12M72B8BKH9S

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Managing virtual machines

30.11.2025

Home » Archive » 2012 » Issue 09: Windo... »

/sysconfig/network-scripts/ifcfg-eth0-e "s///" You need a similar approach with the Udev rules mentioned earlier. In this way, you can also replace the hostname so that it matches the name assigned during

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I/O benchmarks with Fio

30.11.2025

Home » Archive » 2011 » Issue 5: Pen Te... »

/0K /s] [4137 /0 iops] [eta 00m:06s] In the example, the first job is performing a sequential read, marked as r in square brackets, while Fio hasn't initialized the second job, marked as P

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Debugging the Linux kernel with the Qemu emulator

30.11.2025

Home » Archive » 2012 » Issue 07: Xen v... »

. The following command tells the system the hex address of the code segment and the two data segments: add-symbol-file path/hello.ko 0xd8817000 -s .data 0xd88170e0 -s .bss 0xd8817294 Now you can set a breakpoint

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