Challenges Implementing a Generic Backup-Restore API for Linux

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2 Challenges Implementing a Generic Backup-Restore API for Linux Matthias G. Eckermann Senior Product Manager mge@suse.com Vault, Boston, March :45 UTC

3 Picture: "Escribano" by Jean Le Tavernier [1]. Licensed under Public Domain via Wikimedia Commons 3

4 Agenda Traditional Backup/Restore approaches Challenges of the traditional approach Unused capabilities in Linux Missing Features in Linux Requirements to a Generic Backup-Restore API Proposal 4

5 Traditional Backup/Restore approaches

6 Challenges Implementing a Generic Backup-Restore API for Linux Traditional Approaches Physical Layer Block Level incl. Device Mapper Filesystem Application 6

7 Challenges of the traditional approach

8 Challenges Implementing a Generic Backup-Restore API for Linux Challenges Re-Invention of the wheel Missing efficiency Slow adaption to new development Unexpected behaviour 8

9 Unused capabilities in Linux

10 Challenges Implementing a Generic Backup-Restore API for Linux xfs Backup / Restore xfsdump/xfsrestore/xfsinvutil xfs_freeze Clone (with/without new UUID) xfs_copy xfs_freeze 10

11 Challenges Implementing a Generic Backup-Restore API for Linux ocfs2 11 RefLinks (CoW)

12 Challenges Implementing a Generic Backup-Restore API for Linux device mapper Snapshots Deduplication 12

13 Challenges Implementing a Generic Backup-Restore API for Linux ceph Snapshots RBD Level Layering Diff Incremental Snapshots Can be used for Backup/Restore 13

14 Challenges Implementing a Generic Backup-Restore API for Linux btrfs CoW everywhere RefLinks Deduplication Snapshots Send/Receive Diff 14 Implemented as Send without sending the data

15 Missing Features in Linux

16 Challenges Implementing a Generic Backup-Restore API for Linux Missing Features in Linux Local Generic Freeze/Unfreeze for filesystems Synchronized Checkpoint/Restart for applications cgroups? systemd? Distributed Multi system freeze Distributed Snapshots 16

17 Requirements to a Generic BackupRestore API

18 Challenges Implementing a Generic Backup-Restore API for Linux Requirements List = Diff (no data) Resume of a diff Sizing information Export (data) partial full clone Restore full incremental with/without history with/without deduplication 18

19 Challenges Implementing a Generic Backup-Restore API for Linux Requirements (2) Enforce consistency Freeze/Unfreeze incl. application notification 19 Information / Capabilities

20 Proposal

21 Challenges Implementing a Generic Backup-Restore API for Linux The Backup Bus Or Why not a library or just sysfs? Self inspection easy to extend Integrates with other approaches using a bus systemd snapper Option, to transfer messages across machines Easy to plug in for 3rd parties 21

22 MgE

23 Your comments!? Thank you. 23

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