OpenZFS: Using zpool iostat to monitor pool perfomance and health

If you’re familiar with the iostat command—a core tool on FreeBSD, and a part of the optional sysstat package on Debian-derived Linuxes—then you already know most of what you need to know about zpool iostat, which is simply “iostat, but specifically for ZFS.”

Part of our “OpenZFS in Depth” series, we talk about zpool iostat. One of the most essential tools in any serious ZFS storage admin’s toolbox – a tool as flexible as it is insightful.

bhyve: The FreeBSD Hypervisor

Virtualization at a glance

You might know vmware workstation or virtualbox, but do you know about bhyve?
FreeBSD has had varying degrees of support as a hypervisor host throughout its history. For a time during the mid-2000s, VMWare Workstation 3.x could be made to run under FreeBSD’s Linux Emulation, and Qemu was ported in 2004, and later the kQemu accelerator in 2005. Then in 2009 a port for VirtualBox was introduced. All of these solutions suffered from being a solution designed for a different operating system and then ported to FreeBSD, requiring constant maintenance.

OpenZFS: All about the cache vdev or L2ARC

The first thing to know about the “L2ARC” is the most surprising—it’s not an ARC at all. Want to learn more about ARC and it’s primary function?

Part of our “OpenZFS in Depth” series, we talk about the CACHE vdev, better (and rather misleadingly) known as L2ARC.

History of FreeBSD – Part 1: Unix and BSD

FreeBSD, a free and open-source Unix-like operating system has been around since 1993. However, its origins are directly linked to that of BSD, and further back, those of Unix. During this History of FreeBSD series, we will talk about how Unix came to be, and how Berkeley’s Unix developed at Bell Labs.
This is part 1 from a multi-part article series on The History of FreeBSD.

OpenZFS: Understanding Transparent Compression

Transparent (inline) configurable compression is one of OpenZFS’ many compelling features—but it is also one of the more frequently misunderstood features.

Part of our “OpenZFS in Depth” series, we talk about transparent compression and performance-related optimizations.