1. ZFS on Linux
Mircea MITU – Co-Founder IT Assist / CTO
www.itassist.ro
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2. ZFS (quotes)
● “ZFS is the most advanced file system ever
invented” - zfs-fuse.net
● “ZFS is a new kind of file system that provides
simple administration, transactional semantics,
end-to-end data integrity, and immense
scalability” - opensolaris.org
● “ZFS is a combined file system and logical
volume manager designed by Sun
Microsystems. “ - wikipedia.org
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3. ZFS (translation)
● Storage manager
● Modern
● Smart
● Reliable
● Efficient
● Scalable
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4. ZFS attributes
● Storage manager:
● Storage pools
– Devices, Blocks, Files
– Raid arrays
zpool create pool raidz /dev/dsk1 /tmp/file cache /dev/shm/zfscache
● Volume Manager
– Snapshots, clones, volumes
● File System
zfs create pool/root; zfs snapshot pool/root@today
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5. ZFS attributes
● Reliable
● Checksums
● Intent log
● Detects & protects against silent disk corruption (bit
rot)
● Avoids RAID5 write hole
Story: http://blogs.sun.com/elowe/entry/zfs_saves_the_day_ta
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6. ZFS attributes
● Efficient
● Copy-on-write
● Deduplication
● Dynamic stripping
● Cache
● Scalable
● 128bit File System
● “640K ought to be enough for anybody”
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7. Cool stuff
● Instant snapshots: zfs snapshot pool/filesystem@2011-02-24
● Real Copy-on-Write
● Clone/rollback snapshots
● Cache on dedicated fast device (SSD)
● Filesystem migration (to another pool / host)
● zfs send pool/filesystem@2011-02-24 | ssh newhost zfs
receive pool/newfs
● Dynamic stripping (hot add/remove/replace devices from pools)
● Disc scrubbing
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8. NAME USED AVAIL REFER MOUNTPOINT
zfspool/zabbix 157G 2.53T 46.3G /z
zfspool/zabbix@week3 20.7G - 45.5G -
zfspool/zabbix@week2 2.93G - 45.7G -
zfspool/zabbix@week1 2.91G - 45.7G -
zfspool/zabbix@week0 14.9G - 45.9G -
zfspool/zabbix@day7 5.47G - 46.1G -
zfspool/zabbix@day6 3.20G - 46.1G -
zfspool/zabbix@day5 3.65G - 46.1G -
zfspool/zabbix@day4 3.09G - 46.2G -
zfspool/zabbix@day3 3.69G - 46.2G -
zfspool/zabbix@day2 3.21G - 46.2G -
zfspool/zabbix@day1 3.07G - 46.2G -
zfspool/zabbix@day0 0 - 46.3G -
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9. How to get ZFS running on Linux
● On your distro
● ZFS-FUSE.net
● Userland (FUSE) implementation
● Not very fast but stable & easy to run
● ZFSonLINUX.org: native, sources
● KQStor.com (native)
● bins for RHEL6/Fedora 14 & Ubuntu 10.04/10.10
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10. How to get ZFS running on Linux
● Dedicated distros
● Debian GNU/kFreeBSD
● Nexenta (Ubuntu + OpenSolaris kernel)
● OpenSolaris
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11. Benchmarks (Phoronix)
● Benchmarks Of The Official KQ ZFS Linux
Module: http://xurl.ro/1nq0 (Jan 2011)
● Debian GNU/kFreeBSD Benchmarks With Its
New Kernel: http://xurl.ro/75n0 (Oct 2010)
● Running The Native ZFS Linux Kernel Module,
Plus Benchmarks: http://xurl.ro/73020 (Nov 2010)
● Benchmarks Of ZFS-FUSE On Linux Against
EXT4, Btrfs: http://xurl.ro/67p0 (Aug 2010)
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12. ZFS @ IT Assist
● Used in a Disaster Recovery Service
● Offsite ZFS storage for hundreds of servers
● Major benefits:
● High density (due to Copy-on-Write)
● Reliable (fault tolerant, atomic write, checksums)
● Ability to instantly clone current/previous versions of
critical servers
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13. IT Assist - IT as a Service
● Complete IT Outsourcing
● Dedicated services (i.e. Disaster Recovery)
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14. Contact
Thank you for your attention
More information:
Mircea MITU <mircea.mitu@itassist.ro>
Co-Founder / Chief Technical Officer
IT Assist - Your IT Department
www.itassist.ro
twitter.com/mirceamitu
twitter.com/itassist
www.itassist.ro