Linux-use

Wake-On-Lan

Netzwerkkarte in System->Gerätemanager erlauben und Magic Paket einstellen im Bios PCI aufwecken erlauben Mac-Adresse und Netzwerk-IP wissen Linux-Konsolen-Befehl zum Aufwecken auf Uni-Rechner Big-Blue2:

wol -i 132.187.33.255 90:e6:ba:43:c2:dc 

Busfahrer an Uni:

wol -i 132.187.33.255 b8:ac:6f:67:e6:43 

Brücknerstrasse: Bachus

wol -i 192.168.1.255 00:1e:8c:45:f5:df 

Myth

wol -i 192.168.1.255 00:14:85:e8:10:4c

Tool um Windows um Remote-Verbindung schlafen zu legen PowerOff z.B. bei

http://www.chip.de/downloads/Poweroff_21571048.html

Linuxbefehl für OpenSuse um per Konsole zu suspenden:

pm-suspend 

-> Vorsicht: Festplatten verhalten sich komisch

"HDIO_DRIVE_CMD(identify) failed: Invalid exchange" 

bei

 /root/bin/diskserial_sort.sh 

Aufwecken über Fritzbox direkt möglich

Remote-Desktop

Big-Blue: SSH auf wolf.physik.uni-wuerzburg.de mit Tunnel: 33889 auf Ziel 132.187.33.133:3389 Dann localhost:33889

Myth: dergagi.dyndns.org normal (ohne Angabe gilt Port 3389)

Bachus: dergagi.dyndns.org:33890

Ordnergröße in Konsole anzeigen

du -sh /home

Für Platzstatus auf Partitionen

df -h

DU-Meter für SuSE

KTrafficAnalyzer, z.B. über 1-Klick Installation bei http://software.opensuse.org/search

Manuel RPM Pakete installieren

rpm -ihv nedit-5.5-31.8.x86_64.rpm

Locate auf Data/Data2

locate -i -d /data/locatedb "mein suchbegriff"

USB-Device mounten

mount -t ntfs-3g /dev/sdj5 /usb -o force

Opensuse: IP über DHCP erneuern

  1.  Open a terminal and su - to root.
  2. Type ifconfig to show the current IP address that you received from DHCP.
  3. Type dhcpcd -k to send the appropriate signals to dhcpcd.
  4. Now bring the interface back up by typing ifup eth0.
  5. Type ifconfig to show the new IP address.

System-Backup-Image von USB-Platte mounten

mount -o loop /media/Data5/store_root.img /mnt/loop/

Verzeichnisse synchronisieren

mit grsync

Devices neu einlesen im laufenden Betrieb ohne Reboot

blockdev --rereadpt /dev/sdx

KDE Remote Desktop

krdc -> Client

TightVNC -> Client

krfb -> Server (über Konsole z.B. mit Xming starten, wegen Grafik)

Port Forwarding im Router: Kontrolle unter: vi home/root/kde4/share/config/krfbrc

One-Click Install auf Konsole

OCICLI <YMP URL>

Data Scrubbing, automatische Suche einmal im Monat nach BadBlocks

In short: Especially if you run a RAID5 array, trigger an active bad block check on a regular basis, or there is a high chance of hidden bad blocks making your RAID unusable during reconstruction.

Normally, RAID passively detects bad blocks. If a read error occurs, the data is reconstructed from the rest of the array, and the bad block is rewritten. If the block can not be rewritten, the defective disk is kicked out of the active array.

Once the defective drive is replaced, reconstruction will cause all blocks of the remaining drives to be read. If this process runs across a previously undetected bad block on the remaining drives, another drive will be marked as failed, making RAID5 unusable. The larger the disks, the higher the odds that passive bad block detection will be inadaquate. Therefore, with today's large disks it is important to actively perform data scrubbing on your array.

With a modern (>=2.6.16) kernel, this command will initiate a data consistency and bad block check, reading all blocks, checking them for consistency, and attempting to rewrite inconsistent blocks and bad blocks.

echo check >> /sys/block/md127/md/sync_action
echo check >> /sys/block/md125/md/sync_action

You can monitor the progress of the check with:

watch -n .1 cat /proc/mdstat

You should have your array checked daily or weekly by adding the appropriate command to /etc/crontab.

Steht für jeden 8. des Monats in Crontab.

If you find yourself needlessly checking your array (like I was) and want to stop it safely, you can either stop the entire array, or:

echo idle >> /sys/block/md127/md/sync_action
echo idle >> /sys/block/md125/md/sync_action