ext4 block reservation

The filesystem ext4 has a feature called block reservation. When you create an ext4 filesystem then 5% of your available space will be reserved for block reservation by default. For an 20GB filesystem it is only 1GB of reserved space. But if you have an 1.5TB filesystem then 5% are about 75GB already. And that is my case. I have a 1.5TB partition with an ext4 filesystem:

Turning off the Leds on the Cubietruck

Since the Cubietruck (running Linaro) has replaced my home server and has its place in my living room I figured out that the Leds are very annoying! So I deceided to turn them off - all of them! The easiest way is to set the brightness to 0:

# echo 0 > /sys/devices/platform/leds-sunxi/leds/white\:ph11\:led3/brightness

Extend a VXFS filesystem in HP-UX with LVM

Today I needed to extend a VXFS filesystem in HP-UX with LVM. The first thing I did was to figure out the logical volume, the volume group and the size of the volume:

# mount
...
/u04 on /dev/vg02/u04 ioerror=mwdisable,largefiles,delaylog,nodatainlog,dev=40020003 on Thu May 28 11:11:30 2015

Implementing autofs

On the NFS server create your shares by editing the /etc/exports file:

# vi /etc/exportfs
/local/music    192.168.1.0/24(rw,sync,no_root_squash,no_subtree_check)
/local/movie    192.168.1.0/24(rw,sync,no_root_squash,no_subtree_check)

mupen64plus for Slackware

mupen64plus is a N64 emulator. I haven't to much experience with this emulator but the emulator seems to do the job pretty well. So here is a little installation instruction for Slackware.
Start by creating a location were you can store all packages:

# mkdir -p /usr/src/mupen64plus

Before you can install mupen64plus you need three additional libraries:

VxVM vxdg ERROR V-5-1-0 Disk Group ...

Today a colleague asked me about a strange situation when adding new disks to a existing disk group in AIX 7.1. He had two new disks from two different storages. The first disk could be added easily as always:

# vxdg -g oradg adddisk emc_clariion1_79

But when he tried to add the second disk he became the following error:

# vxdg -g oradg adddisk emc_clariion0_80
VxVM vxdg ERROR V-5-1-0 Disk Group oradg has only standard disks and trying to add cloned disk to diskgroup.Mix of standard and cloned disks in a diskgroup is not allowed. Please follow the vxdg (1M) man page.

Migrate/Move PPs in AIX LVM

Today I needed to replace a disk which is used by AIX LVM and which wasn't mirrored. Of course all data should remain.
The first thing I did was to list all volumes on the specific disk (in my case hdisk2):

Apache virtual host

My company asks me to create two new websites. One for the internal intranet another one for the internal blog. For the intranet drupal should be used and for the blog wordpress should be used. To sum it up: two new websites accessable under:

http://intranet.company.com
http://blog.company.com

Configure Nagios statusmap with User-supplied coords

The statusmap is most useful if you use the User-supplied coords function (imho). This article covers the following topics:

Add coords to the host definition
Set the User-supplied coords statusmap as default
Change the image from ? to a valid gd2

WeeWX with simulated data

WeeWX is a nice software that allows you to communicate with your weather station. Unfortunately I don't own a weather station (currently I'm thinking about buying one - that's why I stumbled over WeeWX) but WeeWX offers to simulate a weather station. And that is was this article is about: install WeeWX under Slackware and run it in simulator mode.
Before you can install WeeWX you need a few more python modules, at least configobj, six, pyserial and Cheetah. If you have a weather station than you might more python modules.
Start by creating a build location where you can store all your sources etc: