Hard drives can be forced into hibernate using hdparm. While it was quite easy to implement automatic setting this hibernation values by inserting the appropriate command (hdparm -B intervall device) into /etc/rc.local (which was executed after the boot) on sysvinit-based Linux distributions this changed on newer …

Read More

When a RAID controllers cache battery fails it is a benefit if you can gather the spare part number without any downtime. If your server is equipped with a HP SmartArray controller you can easily get t hose information using the sautil utility. This requires the HP-UX products RAIDSA and RAIDSA-PROVIDER to be …

Read More

I'm not administrating Solaris systems very often - it is even more rare that I need to mount optical media on Solaris. This is just a short reminder so that I don't need to use a search engine everytime. First of all the CD / DVD drive is determined by the iostat command. Afterwards the drive is mounted using the …

Read More

Files can be easily transfered from an Android device to Windows computer using MTP (Media Transfer Protocol). Unfortunately this protocol is not supported in Finder which means that you need to connect your smartphone as hard drive - if this function is supported. My Android 4.4.x ROM isn't supporting this function …

Read More

There is no standard sensor that can be used with lm_sensors to get the temperature of the Raspberry Pi embedded board - what a pity! Fortunately for this function there is a dedicated command called vcgencmd which is already included in the Raspbian image. To make it work you will need to customize the LD library …

Read More

While importing the recent EPEL7 YUM repositories I stumbled upon the following error: 1# /usr/bin/spacewalk-repo-sync --channel epel-el7-x86_64 2> --url http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/ 3> --type yum -c epel-el7-x86_64 4Repo URL: http://dl.fedoraproject.org/pub/epel/beta/7/x86_64/ 5ERROR: xz …

Read More

It is possible that RHEL7 channels aren't available to Red Hat Satellite even though you're having a valid Red Hat Enterprise Linux subscription. The appropriate software channel (rhel-x86_64-server-7) is not part of the list of available channels - it also cannot be downloaded manually: 1# satellite-sync …

Read More

Sometimes it is sufficient to know which RPM GPG-Keys have been imported. You can get this information with the following command: 1# rpm -qa --qf '%{VERSION}-%{RELEASE} %{SUMMARY}\n' gpg-pubkey* 2c105b9de-4e0fd3a3 gpg(CentOS-6 Key (CentOS 6 Official Signing Key) <centos-6-key@centos.org>) …

Read More

A couple of days ago I stumbled upon the following error message while activating Fault Tolerance on a particular virtual machine: Replay is unavailable for the current configuration. First I wasted time by verifying the following topics: checking the VM configuration (vCPUs, OS support, disk provisioning,...) tested …

Read More

If you want to create and sign RPM packages for Enterprise Linux 5 and 6 you will have to consider some things while creating and using the GPG key so that EL5 systems can also use the signed packages. If you create a GPG key using the standard settings and sign a RPM package under EL6 you will get the following error …

Read More