OpenZFS Developer Summit 2015
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The third annual OpenZFS Developer Summit was held in San Francisco, October 19 - 20, 2015. This was the 10th anniversary of the open sourcing of ZFS! All OpenZFS developers were invited to participate.
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The event was streamed live, and you can find all videos and presentations below.
Follow @openzfs or use the #OpenZFS tag on twitter.
Thanks to the 2015 Beer Bash and Platinum sponsors for their support!
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Event
Photos
Photos of the event can be viewed on the OpenZFS Google+ page.
Presentations
| Title | Speaker | Company | Slides | Video |
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| Keynote | Matt Ahrens | Delphix | Slides | Video |
| OpenZFS Success Stories | Tarkan Maner | Nexenta | Slides | |
| ZFS Internals Overview | Kirk McKusick | Independent | Slides | Video |
| ZFS Send and Receive | Paul Dagnelie | Delphix | Slides | Video |
| Compressed Send and Receive | Dan Kimmel | Delphix | ||
| Live Migration with Zmotion | Francois Lesage | OVH | Slides | Video |
| The Birth of ZFS | Jeff Bonwick | DSSD, EMC | None | Video |
| Parity Declustered RAID-Z/Mirror | Isaac Huang | Intel | Slides | Video |
| Improve Performance on AWS with Eager Zero | Joe Stein | Delphix | Slides | Video |
| Compressed ARC | George Wilson | Delphix | Slides | Video |
| Discontiguous Caching with ABD | David Chen | OSNexus | Slides | Video |
| Persistent L2ARC | Saso Kiselkov | Nexenta | Slides | Video |
| Dedup Ceiling | Saso Kiselkov | Nexenta | ||
| Writeback Cache | Alex Aizman | Nexenta | Slides | Coming Soon |
| Sandboxing OpenZFS on Linux | Albert Lee | OmniTI | Slides | Coming Soon |
| SPA Metadata Allocation Classes | Don Brady | Intel | Slides | Coming Soon |
| Ztour | Don Brady | Intel | Slides | Coming Soon |
| Day 1 Closing | Matt Ahrens | Delphix | None | Coming Soon |
| Day 2 Hackathon Presentations & Awards | Hackathon Participants | - | None | Coming Soon |
Projects started at the hackathon
Medium-size hackathon projects
- zfs clone --nopromote (Dan K)
- store total # blocks on disk (of each type, in each ds, etc) (George W)
- use refcount_t for v_count (fileystem-ey but not ZFS)
- embedded slog (George W)
- on-disk map from dataset GUID -> set of object IDs
- Simplify dbuf_free_range by removing dn_unlisted_l0_blkid (perf testing)
- scrub specific dataset
- channel programs! (Alvin)
- add LZ4HC compression
- allow receive of -L / -e / -c streams on systems with the required feature flags disabled
- allow spacemap to represent larger range with one entry (increase entry size)
Simpler hackathon projects
- break zfs/zpool manpages into one page per subcommand
- zfs send —current-format
- “zfs API” subcommand to enumerate software capabilities (e.g. what CLI flags are allowed, when things change (zfs send -nv now outputs to stdout instead of stderr))
- expose send size estimation from bookmarks through sbin/zfs
- we should not attempt to write to ZFS while panicking (illumos-specific)
- more type safety in ZFS: typedef struct { uint64_t doi_id} dmu_object_id_t
- ::spa -h should show free space histogram for whole pool
- metaslab size can exceed offset addressable by spacemap
Backlog ideas
- error counts in per-vdev object
- scrub on readonly pool (on top of sorted scrub code?)
- “resilver groups”/“vdev-directed resilver” where additional failure does not cause scrub to restart
- preferred allocation alignment (george)
- promote prefetch reads to sync reads
- runtime lock analyzer (like freebsd WITNESS)
- test suite for system attributes
- show clone-origin relationships with zfs list --graph
- feature flags support for disabling inactive features
- ZFS should prefer gethrtime() to ddi_get_lbolt()
- create vdev in syncing context (with sync task)
- Add interface for creating file with specific recordsize
- does ::abuf_find still work?
- make spa_load_impl() always use config from the MOS (except for finding devices)
- also spa_unload() would have to be made more airtight
- JSON command output
- zfs help command
- zfs set print usage message specific to property you're trying to set
- make zfs recv less trusting
- convert some AVL trees to b-trees or hash tables
- cross platform xattr
A huge THANK YOU to the sponsors of the 2015 OpenZFS Developer Summit:
Beer Bash
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Platinum
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Gold
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Silver
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Bronze
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Special thanks:
- Hackathon prizes - Thank you Nexenta!
- Conference branding, t-shirt and banner design - Thank you Aaron Holding!
- Design and creation of conference badges - Thank you Syneto!
Harassment Policy
OpenZFS Developer Summit is dedicated to providing a harassment-free conference experience for everyone, regardless of gender, gender identity and expression, sexual orientation, disability, physical appearance, body size, race, age or religion. We do not tolerate harassment of conference participants in any form. Sexual language and imagery is not appropriate for any conference venue, including talks. Conference participants violating these rules may be sanctioned or expelled from the conference at the discretion of the conference organizers.
For information about last year's event, see the OpenZFS Developer Summit 2014 page.