Software update: OpenZFS 2.1.0

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The open source zfs file system was originally developed by Sun for Solaris, but in 2013 a number of developers founded OpenZFS to ensure further development. The file system is currently officially supported on Linux and FreeBSD. It includes methods to prevent data corruption in both the data and metadata, provides data redundancy via raid-z and saves space by transparently compressing the data. For more information, we refer you to the OpenZFS website. The developers released version 2.1.0 this summer with the following notes:

Supported Platforms

  • Linux: compatible with 3.10 – 5.13 kernels
  • FreeBSD: compatible with releases starting from 12.2-RELEASE

Major New Features

  • Distributed Spare RAID (dRAID) – Create pools using a new distributed variant of RAIDZ which enables dramatically faster resilver times using integrated hot spares. Full redundancy can be restored to the pool in a fraction of the time normally required to do a full disk replacement. #10102
  • Compatibility Property – The new compatibility property lets administrators specify the set of features which should be enabled on the pool. This fine grained control makes it easy to create portable pools and maintain pool compatibility between OpenZFS versions and across platforms. #11468 #11861
  • InfluxDB Support – Collect pool statistics with the zpool influxdb command in an InfluxDB time-series database for analysis and monitoring. #10786

Changes to the zpool / zfs commands

  • zpool create -u – Prevent filesystems from being automatically mounted. #11254
  • zpool history -i – Pool history now includes how long each command took for performance analysis. #11440
  • zpool status – Informs users of any disks which are using a non-optimal block size. #11088
  • zfs send –skip-missing|-s – Skip missing snapshots when sending replication streams. #11710
  • zfs rename -u – Rename a filesystem without remounting. #10839

Notable Changes

  • Extensive modernization of the man pages. #12125 #12129 #12149 #12169 #12212
  • Updated vdev_id to support daisy-chained JBODs in multipath mode. #11526
  • Updated arcstat with new L2ARC statistics and added -a (all) and -p (parsable) command line options. #10743
  • Support for memory and CPU hot plugging. #11212
  • Renamed acltype=posixacl to acltype=posix, an alias was added for compatibility. #10918
  • Added automated ABI validation for public library interfaces. #11287
  • Added sysctl for fletcher4 on FreeBSD #11270


  • Improved performance for interactive I/O. #11166 #11116
  • Optimized prefetch for parallel workloads. #11652
  • Improved scalability by reduced contention on locks and atomics. #11288 #12172 #12145 #11904
  • Reduced pool import time. #11470 #11502 #11469 #11467 #11467
  • Reduced fragmentation from ZIL blocks. #11389
  • Improved zfs receive performance with lightweight write. #11105
  • Improved memory management. #12152 #11429 #11574 #12150
  • Improved module load time. #11282

Additional Information

  • Documentation – Updated OpenZFS documentation for Linux and FreeBSD.
  • Change log – Complete v2.0.0 – v2.1.0 change log
  • Module options – The default values ​​for the module options were selected to yield good performance for the majority of workloads and configurations. They should not need to be tuned for most systems but are available for performance analysis and tuning. See the module parameters documentation for the complete list of the options and what they control.

Version number 2.1.0
Release status Final
Operating systems Linux, BSD
Website OpenZFS
License type Conditions (GNU/BSD/etc.)
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