AIX

It has been a while… Today – Monitor I/O in AIX

Byetzion 25/11/2006

It is a question I’ve been asked a while back, and didn’t find the time to search for it.

I have searched for an answer just now, and got to an answer given by one of the old-time gurus (most likely) in news servers (where the gurus lurk, usually). The answer is to use the command "filemon" in a syntax such as this:

filemon -O lf -o outputfile.txt

To stop the monitoring session, run "trcstop". Review the output file generated by this command, and you will be able to view the I/O interactions which happened during that time on the system.

Disk Storage | Linux

Reduce traverse time of large directory trees on Linux

Byetzion 14/12/202127/01/2023

Every Linux admin is familiar with the long time running through a large directory tree (with hundred of thousands of files and more) can take. Most are aware that if you re-run the same run-through, it will be shorter. This is caused by a short-valid filesystem cache, where the memory is allocated to other tasks,…

Disk Storage | Linux

net-snmp broken in RHEL (and Centos, of course) – diskio

Byetzion 09/06/2007

I’ve had a belief for quite a while now that Linux, unlike other types of systems, was unable to produce any I/O SNMP information. I only recently found out that it was partially true – all production-level distros, such as RedHat (and Centos, for that matter) were unable to produce any output for any SNMP…

Linux

Some few small insights

Byetzion 12/03/2008

Lately I have been overloaded above my capabilities. This did not prevent me from doing all kind of things, but most of them are too small to justify a real entry here, so I have decided to make a small collection of small stuff someone might need to know, in order to make it indexed…

Linux

Graphing on-demand Linux system performance parameters

Byetzion 20/05/2008

Current servers are way more powerful than we could have imagined before. With quad-core CPUs, even the simple dual-socket servers contain lots of horse-power. Remember our attitude towards CPU power five years ago, and see that we’re way beyond our needs. When modern servers are equipped with at least eight cores, other, non-CPU related issues…

Disk Storage | Linux | Scripting/Programming | Virtualization

Quick provisioning of virtual machines

Byetzion 01/02/2008

When one wants to achieve fast provisioning of virtual machines, some solutions might come into account. The one I prefer uses Linux LVM snapshot capabilities to duplicate one working machine into few.

This can happen, of course, only if the host running VMware-Server is Linux.

LVM snapshots have one vast disadvantage

Linux

Audit delete commands in Linux

Byetzion 22/10/2017

(This article is the essence of a post from this Redhat Archive and it goes as follows: Problem: You need to detect what deletes files on your Linux Solution: Using auditd, with the right flags, you could get a lot of information. In Practice: If the mount point/directory is /oracle, then: (as root:) auditctl –w /oracle -k whodeletedit -p…

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