FreeBSD Turn On Process Accounting – Track System Resources Used By Users

Posted on in Categories FreeBSD, Howto, Monitoring, Security, Sys admin, Tips, Troubleshooting, Tuning last updated January 8, 2009

I’ve already written about Linux process accounting under Linux ( see how to keep a detailed audit trail of what’s being done on your Linux systems). You can easily setup process accounting under FreeBSD. This tutorial expalins how to enable and utilizing FreeBSD process accounting including many other useful options are explained to keep track of system resources used, and their allocation among users.

FreeBSD Kernel Critical Update: arc4random predictable sequence vulnerability

Posted on in Categories FreeBSD, Security, Security Alert last updated November 25, 2008

FreeBSD today released a core (kernel) patched to plug “arc4random predictable sequence vulnerability” security hole in its operating systems version 6.x and 7.x stable release. When the arc4random random number generator is initialized, there may be inadequate entropy to meet the needs of kernel systems which rely on arc4random; and it may take up to 5 minutes before arc4random is reseeded with secure entropy from the Yarrow random number generator. All security-related kernel subsystems that rely on a quality random number generator are subject to a wide range of possible attacks. This update has been rated as having important security impact.

Linux: Should You Use Twice the Amount of Ram as Swap Space?

Posted on in Categories data center, Debian Linux, fedora linux, File system, FreeBSD, Gentoo Linux, kernel, Linux, Linux desktop, Linux laptop, OpenBSD, RedHat/Fedora Linux, Solaris, Storage, Suse Linux, Tuning, Ubuntu Linux, UNIX last updated December 8, 2008

Linux and other Unix-like operating systems use the term “swap” to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast as swap partitions. Now, many admins (both Windows and Linux/UNIX) follow an old rule of thumb that your swap partition should be twice the size of your main system RAM. Let us say I’ve 32GB RAM, should I set swap space to 64 GB? Is 64 GB of swap space really required? How big should your Linux / UNIX swap space be?

FreeBSD Forums Launched

Posted on in Categories FreeBSD, Links, News last updated November 18, 2008

Excellent news, now you can get FreeBSD support directly from Freebsd community.

The FreeBSD project is finally, after much work, pleased to announce the availability of an official FreeBSD web based discussion forum. This forum will serve as a public support channel for FreeBSD users around the world and as a complement to fine mailing lists.

=> FreeBSD forum

RAID 5 vs RAID 10: Recommended RAID For Safety and Performance

Posted on in Categories File system, FreeBSD, Hardware, Linux, OpenBSD, RedHat/Fedora Linux, Storage, Suse Linux, UNIX, Windows server last updated December 28, 2009

A Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks) (RAID) is an term for data storage schemes that divide and/or replicate data among multiple hard drives. RAID can be designed to provide increased data reliability or increased I/O performance, though one goal may compromise the other. There are 10 RAID level. But which one is recommended for data safety and performance considering that hard drives are commodity priced?