ZFS at a Glance

A presentation on NIU LUG. Basic concepts and features about the ZFS file system.

Transcript

1. ZFS at a Glance by Zhihao Yuan <lichray@gmail.com>
2. Concept 0: Copy-on-Write • Data integrity vs. File system consistency • COW: No journal*, no locking, SSD friendly. * O_FSYNC is an exception
3. Concept 1: Pooled Storage zpool create ztank mirror ada0p1 ada1p1 da1s1 log ada2p1 zfs create -o compression=on -o setuid=off ztank/home zfs create -o atime=off ztank/var zfs create ztank/usr zfs create ztank/usr/local
4. Pool Maintenance • Portability zpool import -R /fakeroot ztank2 zpool export ztank2 • Scalability & Availability # adds/replaces the devices online zpool add ztank raidz gpt/disk3 gpt/disk4 da0s1 zpool replace ztank /dev/da1s1 gpt/disk6 • Updatability zpool upgrade # updates to the latest on-disk format online zfs upgrade # as well as the file systems
5. Concept 2: Datasets A zpool can be used to create: • File system zfs set mountpoint=/usr/home ztank/home • Volume A raw/block device with ZFS Copy-on-Write semantic zfs create -V 10G ztank/linux mkfs.ext4 /dev/zvol/ztank/linux • Snapshot A read-only, light-weight copy of a file system or volume zfs snapshot ztank@now zfs rollback ztank@now
6. Snapshot Usage Perform version control on your file system!
7. Features • Performance Prefetch, ARC/L2ARC, dynamic striping • Stability & Safety Copy-on-Write transactions, self-healing with checksum • Space Utilization Variable length blocks, compression, dedup (ZFS v28) • Security NFSv4 ACL, zfs-cryto (Oracle® only)
8. Resources 1. Man pages: zpool(1M), zfs(1M) 2. Oracle Solaris ZFS Administration Guide: http://download. oracle.com/docs/cd/E19253-01/819-5461/index.html 3. ZFS blogs: http://blogs.oracle.com/main/tags/zfs 4. FreeBSD: http://wiki.freebsd.org/ZFS
9. Thanks for watching Questions?