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Zumastor: Enterprise NAS for Linux Daniel Phillips phillips@google

Zumastor: Enterprise NAS for Linux Daniel Phillips phillips@google.com. or: It is high time Tux arrived in the NAS space. Zumastor Linux Storage Server. Multiple live volume snapshots User accessible snapshots Remote volume replication Online volume backup Kerberized NFS and Samba

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Zumastor: Enterprise NAS for Linux Daniel Phillips phillips@google

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  1. Zumastor: Enterprise NAS for Linux Daniel Phillips phillips@google.com

  2. or: It is high time Tux arrived in the NAS space...

  3. Zumastor Linux Storage Server • Multiple live volume snapshots • User accessible snapshots • Remote volume replication • Online volume backup • Kerberized NFS and Samba • CIFS previous versions API • Easy administration interface • NVRAM acceleration (work in progress)

  4. ddsnap virtual block device • ddsnap is the engine of zumastor • Originally designed for cluster snapshots • Small kernel driver coupled to biggish user space server • rpc-like interface between kernel and user space • but not big and fat like rpc • Copy-before-write snapshot strategy

  5. ddsnap remote replication • Which chunks are different between two snapshots? • ddsnap server peeks into metadata • Then read snapshot data to build a volume delta • Get delta as a file or stream it • Various kinds of delta compression

  6. Zumastor Volume Monitor • Hides the details of ddsnap, dmsetup, virtual device names, mountpoints • Scheduled snapshot rotations • Implements complex replication topology • All driven by a filesystem based database • Easy to use database editing interface

  7. Snapshot write performance • Origin Read performance is great • Write performance does not degrade with number of snapshots • Write performance improves with larger chunk size • Write performance improves a lot with metadata in NVRAM • Write performance still pretty bad overall, partly covered up by NFS slowness

  8. Delta compression performance • Delta size equates to replication time • Compression is a big payoff for slow links • Extent oriented, need big chunks to work on but still need to stream • zlib (gzip) for compression • xdelta for binary differencing • Compress or binary difference? • Try both and pick the best

  9. Delta compression performance

  10. Zumastor Futures • It's going to get more features • It's going to get faster and more robust • It's going to get bigger

  11. Zumastor Futures • Give me a graphical front end • Give it to me over the web • Give me a real volume manager • What about online resizing? • Can I have incremental backup too? • Faster, yah Faster! • I don't want to buy NVRAM, can you make it so I don't need it?

  12. Zumastor Linux Storage Server Zumastor homepage: http://zumastor.org IRC channel: irc.oftc.net #zumastor

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