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SmartOS ZFS Architecture


Presented at BayLISA meetup, August 16, 2012

Presented at BayLISA meetup, August 16, 2012

Published in Technology
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  • 1. SmartOS ZFS Architecture Bill Pijewski Software Engineer, Joyent @pijewskiFriday, August 17, 2012
  • 2. ZFS 101 • ZFS is a copy-on-write filesystem from Sun originally shipped with Solaris 10 • Many innovative features: data compression, snapshot/rollback, ZFS send/receive, SSD integration • Enterprise-grade reliability and data integrity • Two main components relevant here: • ZFS pools • ZFS datasetsFriday, August 17, 2012
  • 3. ZFS Pools • Aggregate disks into a single storage pool from which “datasets” are allocated • No parted/LVM needed • Mix both spinning disks and SSDs: • L2ARC: extends filesystem buffer cache • ZIL: absorbs synchronous write activityFriday, August 17, 2012
  • 4. ZFS Datasets • Datasets are a tree of blocks within the storage pool, presented as either: • A filesystem (file interface) • A volume (block interface) • Datasets can be flexibly resized, and volumes can even be thinly provisioned • Administrative controls on datasetsFriday, August 17, 2012
  • 5. SmartOS Diskless Boot • Instead of installing OS to root disks, SmartOS boots from a USB key • Entire kernel and userland fit in about 200 MB (compressed) • Other software can be installed from pkgsrc • For our cloud, we network boot each system • Single ZFS pool for all virtual machines • Swap device, dump device, zone configuration all live on that single poolFriday, August 17, 2012
  • 6. Diskless Boot Advantages • Upgrade is as simple as a reboot • All disks are available for zone/VM storage, thereby increasing both performance and capacity • Encourages users to provision a zone for each application, rather than using the GZ • Discourages customization and one-off patching • Easy to “bring your OS with you”Friday, August 17, 2012
  • 7. Zones and VMs • A zone is a lightweight software-virtualized container • Uses the systemʼs OS platform • Allocated its own ZFS filesystem (more in a sec) • A VM is a hardware-virtualized container for GNU/ Linux, Windows, BSD, etc. • Uses its own ZFS volume • VMʼs filesystem installed into ZFS volume • Both machines have resource controls for CPU, memory, and disk I/OFriday, August 17, 2012
  • 8. Advantages of ZFS • Snapshots: zone/VM backup and recovery • Space management: reservations and quota flexibly allocate space between zones • Delegated administration: each tenant can administer their own dataset: • Set compression level and other properties • Take snapshots of application data • Generate send streams for replication/backupFriday, August 17, 2012
  • 9. Advantages of ZFS (2) • Data integrity: verifies data of VM guest filesystems (ext4, XFS, NTFS, etc.) • Multiple storage configurations available: mirrored, RAID-Z2, and others • System fully supported on any storage configurations, can even take a crash dump to a RAID-Z poolFriday, August 17, 2012
  • 10. Summary • Netboot from USB key, no OS install required • Single ZFS pool for all tenants • Individual controls for each tenantʼs filesystemFriday, August 17, 2012
  • 11. Questions? FOR MORE INFORMATION VISIT OR www.smartos.orgFriday, August 17, 2012
  • 12. SmartOS ZFS Architecture Bill Pijewski Software Engineer, Joyent @pijewskiFriday, August 17, 2012