Linux Cache-Speicher freigeben

#works for Kernels 2.6.16 and up
#flush file system buffers (sync to disc)

sync

#drop page-cache directory-entries and inode-cache

echo 3 > /proc/sys/vm/drop_caches

#more info at http://www.linuxinsight.com/proc_sys_vm_drop_caches.html

Centos 5.5 Live auf USB Stick

Receipe adapted from http://www.pendrivelinux.com/usb-centos-5-live-install-via-windows/ :

Create a CentOS 5.5 64bit Live USB Flash Drive in Windows:

1. Download the Fedora liveusb-creator-x-x.zip and extract
https://fedorahosted.org/releases/l/i/liveusb-creator/liveusb-creator-3.7.zip
2. Download CentOS-5.5-x86_64-LiveCD.iso
http://ftp.halifax.rwth-aachen.de/centos/5.5/isos/x86_64/CentOS-5.5-x86_64-LiveCD.iso
3. Navigate to the liveusb-creator-x-x folder and click liveusb-creator.exe to launch the tool

4. A progress bar will indicate the progress of your USB CentOS creation. Once the process has finished, restart your PC and set your System BIOS or Boot Menu to boot from the USB flash drive

Resizing + creating LVM partitions

display logical volumes:

:~# vgdisplay -v vg00

#resize a partition and the filesystem on it:

:~# lvextend -L +20G /dev/vg00/var
:~# xfs_growfs /var

#create a new volume in volumegroup vg00

:~# lvcreate -L 75G -n data2 vg00
:~# mkfs.xfs /dev/vg00/data2

:~# mkdir /data2
:~# mount -t xfs /dev/vg00/data2 /data2
:~# nano /etc/fstab