Create a new file on the pool we just created (Listing 2). ![]() NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT Now let’s create a zpool with zpool # zpool create tutorial /array/disk00 You can check what zpools exist with zpool # zpool list Before creating new zpools, you should check for existing zpools to avoid confusing them with your tutorial pools. We can check pools with the zpool(8) command. Here, I’m creating 4 disks of 128MB each as you can see in the ls output.Īll ZFS file systems live in a pool, so first we need to create a zpool. Now let’s create some disks! NOTE: If you don’t have the mkfile utility, you just need to: Listing 1. The default size is in bytes, but it can be flagged as exabytes, petabytes, terabytes, gigabytes, megabytes, kilobytes, or blocks with the e, p, t, g, m, k, or b suffixes, respectively. The file is padded with zeros by default. mkfile creates one or more files that are suitable for use as NFS-mounted swap areas, or as local swap areas. I will use the mkfile(8) utility to create some files and use those as disks. We will use files to simulate real disks so we can test things safely. To try some ZFS features, first we need to create pools. We will take a look at these basic functionalities: The purpose of this tutorial is to explore some ZFS features in a safe way to grasp the power and flexibility of this file system. Around 512 MB of disk space (for simulating disks).US.ISO8859-1/books/handbook/filesystems-zfs.html). clone (file system with initial contents of a snapshot)įor more information about this you can always.snapshot (read-only copy of file system or volume).cache (L2 cache, may not be mirror or raidz)Įach ZFS pool contains ZFS datasets.log (separate ZIL device, may not be raidz).raidz, raidz2, raidz3 (single to triple parity RAID-Z).A ZFS pool is a storage object consisting of virtual devices. The ZFS file system uses two main objects: Pools and Datasets. checksums and self-healing (scrub, resilver).transactional semantics (copy-on-write).pooled storage (integrated volume manager).8.0 – new ZFS v13 code, lots of bug fixes – recommended over all past versions (no longer supported).7.3+ – backport of new ZFS v13 code, similar to the 8.0 code.7.2 – still ZFS v6, improved memory handling, amd64 may need no memory tuning (no longer supported).7.0+ – original ZFS import, ZFS v6 requires significant tuning for stable operation (no longer supported).FreeBSD’s ZFS file system has been updated by merging improvements from the illumos project.Ĭurrent FreeBSD implementation of ZFS is ZFS Pool version 28. ZFS has many innovative features including an integrated volume manager with mirroring and RAID capabilities, data checksumming and compression, writable snapshots that can be transferred between systems and many more. ![]() It originates from the OpenSolaris project and first appeared in FreeBSD in 2008. ZFS is a modern 128-bit file system based on the copy-on-write model. RAID-Z provides redundancy similar to hardware RAID, but is designed to prevent data write corruption and to overcome some of the limitations of hardware RAID.” It uses a software data replication model, known as RAID-Z. ![]() It is also designed for maximum data integrity, supporting data snapshots, multiple copies, and data checksums. “The Z file system, originally developed by Sun™, is designed to use a pooled storage method in that space is only used as it is needed for data storage.
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