Should We Worry About Virtual Disk Fragmentation?

Recently, I explained about qcow2 or QEMU Copy-On-Write v2 and some performance trade-offs for virtual disks. One thing that might alarm you is the appearance of a high percentage reported fragmentation on compressed qcow2 disks. Don’t worry, this isn’t what you probably think! That’s all you really need to know, keep reading if you want […]
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Performance Tuning on Virtual Machines

The qcow2 virtual disk format uses copy-on-write to delay allocation of storage until it is needed, reducing the amount of disk space used. It can use Zlib compression to further save space. Last week, I showed you an example of a virtual machine with a 16 GB disk with 2.7 GB in use on its […]
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Efficient Storage for Linux Virtualization

I was recently helping someone migrate some virtual machines from VMware to Linux. That is, the virtual machines had been running on top of VMware Workstation, which was running as an application on Windows. The plan was to move the VMs to a Linux platform, taking advantage of the KVM (or Kernel Virtual Machine) support […]
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Virtualization for Compartmentalization

Virtualization usually first enters an organization for economic reasons. Either the cost for buying physical servers, for power and cooling needs, or else for paying the staff needed to maintain full operating systems on independent hardware platforms. Cost is a compelling reason, but there’s more. Also consider your ability to compartmentalize processes to a degree […]
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Don’t Fall Behind — Learn About UEFI

I was recently surprised when I found myself CC’ed on a forwarded email from a company marketing itself as a significant provider of cloud computing Infrastructure-as-a-Service (or IaaS). The message, from one of the cloud provider’s engineers to a group mostly comprised of his co-workers, bore what to him had been surprising news: Hey, there's […]
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