ext4 optimization and throughput (Preview)

Scenario: Debian Stable 6.0 under VmWare ESXi 4.1

Cases:

• 1 core and 497 Mb RAM
• 4 cores and 4Gb RAM

Test used:  Phoronix Test Suite

Mount options:

• defaults
• noatime
• long  noatime,barrier=0,data=writeback,nobh,commit=100,nouser_xattr
• no_journal - defaults, but fs created with "mkfs.ext4 /dev/sdb1 -O^has_journal" defaults

Results Case1 (1 Core):

http://openbenchmarking.org/result/1103167-IV-EXT45694130

Results Case2 (4 Cores):

http://openbenchmarking.org/result/1103166-IV-EXT44CORE94
Results Case1 & Case 2 Mixed:

http://openbenchmarking.org/result/1103160-IV-MERGE353122 (It has some visualization problems)

Comments:

To be update... soon

Improvements to do:

Test in a bare installation, and testing hypervisor overload (vmware Vs. kvm)

Avoiding unnecesary restarts

When you have a lot of servers to manage from a single keyboard/monitor, sometimes is easy to reboot a Linux system when trying to login into a Windows one using the crtl+alt+del keys. To solve this, just comment this line in the /etc/inittab file:

ca:12345:ctrlaltdel:/sbin/shutdown -t1 -a -r now

apt-get install without recommends

To automatically ignore recommends packages just:

echo 'APT::Install-Recommends "0";' >> /etc/apt/apt.conf.d/70debconf