Name: The Power of the Device Mapper - From Dm-cache To Dm-zoned - Werner Fischer, Thomas-Krenn.AG
Start: 2025-08-26T11:55:00+0200
End: 2025-08-26T12:35:00+0200

25-27, August 2025
Amsterdam, Netherlands
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Tuesday August 26, 2025 11:55 - 12:35 CEST

G102-103

The device mapper has been part of the Linux kernel since kernel version 2.6. It allows the creation of virtual block devices by mapping their address space to other block devices or special functions. In this way, it can map physical block devices such as hard disks or SSDs to higher-level virtual block devices. It is the basis for the Logical Volume Manager (LVM), Linux software RAIDs and dm-crypt encryption, and provides additional features such as file system snapshots.

However, the use of Device Mapper targets is not limited to that. Many other targets offer often unknown features. Most of these are intended for production use. However, there are also some targets designed specifically for debugging.

In this talk, Werner gives a full overview of all Device Mapper targets.

For production use these are: dm-cachd, dm-clone, dm-crypt, dm-ebs, dm-era, dm-integrity, dm-linear, dm-mirror, dm-raid, dm-stripe, dm-switch, dm-thin, dm-unstripe, dm-verity, dm-vdo, dm-writecache and dm-zoned.

For debugging: dm-delay, dm-dust, dm-flakey and dm-zero.

He also briefly shows drbd, md (RAID) and bcache, which, like device mapper targets, can work as devices "on top" of normal block devices.

Speakers

Werner Fischer

Product Manager, Thomas-Krenn.AG

Werner studied computer and media security in Hagenberg and then worked at IBM for two years, where he wrote two Redbooks with colleagues. He has been working in the Linux area at Thomas-Krenn.AG since 2005. His previous roles include HA clusters, devops, 3rd level support, security... Read More →

Tuesday August 26, 2025 11:55 - 12:35 CEST
G102-103

Linux

Audience Experience Level Beginner

Open Source Summit Europe 2025

Werner Fischer

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