When a process in Linux has issued an IO and is waiting for a response there are basically two different possibilities. The good case is that there is other work pending and the CPU can continue to work. If there … Read the rest
(updated 3/12/2013)
Virtual Dynamically-linked Shared Object (VDSO) is a shared library provided by the kernel. This allows normal programs to do certain system calls without the usual overhead of system calls like switching address spaces.
For … Read the rest
Recently there has been quite some discussion around the support for OCFS2. SUSE has published their support statements in two blog entries:
More and more installation tools use the cio_ignore kernel parameter. This parameter has been developed to allow hiding of devices from Linux, especially when using production Linux systems in LPAR.
The approach used in installers / automation systems is to … Read the rest
The startup time for servers increased during the last years. So even for development and test servers it’s now common to either let them run or pause them. On z/VM with Linux on System z there are two different methods … Read the rest
Recently there has been a small bug fix for the swap behavior of Linux on System z. The following problem has been observed by several users:
The first time Linux started swapping it was doing so really extensively even though … Read the rest
There have been several complaints with respect to the RMAN CPU usage on Linux on System z. At the bottom of this was always the use of the ‘BASIC’ compression method in RMAN.
So if your CPU is also too … Read the rest
A frequently asked question for Linux on System z is which distributions are supported with what hardware. There are two different sources for this: