Tuning VM Disk Performance

Qemu/kvm provides you with a plethora of ways to configure your storage devices. Yet no other type of device shows such a variance in its performance, with disk I/O throughput anywhere from stellar to abysmal using the very same hardware.

In this post I like to show some configuration options that have worked well for me. For an in-depth presentation on the latest developments and features, with hands-on examples, see Storage Performance Tuning for FAST! Virtual Machines. Continue reading “Tuning VM Disk Performance”

Monitoring Hard Drives Using Smartmontools

Yesterday I wrote about Linux security and the need for monitoring hard drives for failure symptoms. As if this was an omen, today the following message popped up on my screen:

Smartmontools notify: Hard Disk Health Warning

Continue reading “Monitoring Hard Drives Using Smartmontools”

qemu-system-x86_64 -drive options

In an attempt to make the qemu -drive command line options more accessible, here is an extract from the qemu-system-x86_64 man page. You can get the complete man page by entering the following in a terminal window:
man qemu-system-x86_64

The options below are valid for qemu-system-x86_64 version 2.5.0. Please refer to the qemu documentation at qemu.weilnetz.de – look for the version you got and select the corresponding sub-folder. You find the latest documentation (qemu 3.0.0) here. Continue reading “qemu-system-x86_64 -drive options”