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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How Do LVM and RAID Compare?

LVM is storage distributed across several physical disks, which tempts people into thinking it has the same benefits as RAID. But in some ways LVM and RAID are opposites! In Learning Tree’s Linux server administration course we teach you about LVM, but we don’t try to convince you that it’s either great or dangerous. It […]
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How to Set Up LVM Physical Volumes

Does LVM need a disc-wide partition? One nice thing about teaching courses is that I also get to learn. A wide range of attendees means a wide range of views. I was recently teaching Learning Tree’s Linux server administration course, which has a chapter on storage management with an emphasis on creating and expanding LVM […]
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How To Use Linux Containers (LXC) With LVM

Last week I was explaining how Logical Volume Management or LVM was useful for file system maintenance on Linux. Containers are all the rage on Linux now, and LVM supports them very nicely. Let’s see how to do that! First, though, what are Linux Containers or LXC? LXC or a container is a virtualization environment. […]
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How Can Linux Logical Volume Management (LVM) Help You?

Logical Volume Management or LVM is commonly used for Linux storage. If everyone is using it, there must be some good reason, right? Actually, there are several. Let’s see how we can take advantage of LVM. LVM Terminology and Concepts Physical volumes are disks or partitions. UEFI firmware needs a small EFI System Partition (or […]
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