You Just Installed Red Hat? Now It’s Time to Fix the Names

The installer for Red Hat Enterprise Linux ported faithfully to CentOS, doesn’t give you a lot of control. Or at least not obvious control. You can work around some of the annoyances if you know the right tricks. Let’s look into fixing some of them after the fact. This will be a usefully challenging test […]
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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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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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Linux File Systems: Heading Toward Btrfs

I’ve recently told you about the Ext–Ext2–Ext3–Ext4 series of Linux file systems, and the XFS file system originally invented by Silicon Graphics and now the default file system in many Linux distributions. Where are things going? Enterprise-Class File Systems Linux came from humble beginnings, just consider Linus Torvalds’ original announcement. Meanwhile the engineers at Sun […]
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