FreeBSD ZFS snapshots and "previous versions"

[Dennis Steinkamp]

Thank you for your reply.
Yeah, i know about FreeNAS and it`s great dont get me wrong but its 
often a little bit behind the most recent
freebsd versions and i`d like to do this in a more "puristic" approach.

I always thought that FreeNAS doesn`t support snapshots through previous 
versions properly.
Did that change in any way with Samba4?


Am 29.03.2016 um 18:08 schrieb Matthew Seaman:
> On 2016/03/29 16:35, Dennis Steinkamp wrote:
>> - Are OmniOS and FreeBSD are on the same ZFS version (or at least equal
>> feature wise)
> Pretty much, yes.  Since the end of the Oracle code, there's hasn't been
> a version number per-se, but a set of feature flags.  Given you're using
> a system based on OpenZFS code, so long as you have support for the same
> set of feature flags then you should have compatible functionality.
>
> You can see what feature-flags are supported on any system by running
> 'zpool upgrade -v' -- this is what you get on a recent 10.3-PRERELEASE
> machine:
>
> {{{
> % zpool upgrade -v
> This system supports ZFS pool feature flags.
>
> The following features are supported:
>
> FEAT DESCRIPTION
> -------------------------------------------------------------
> async_destroy                         (read-only compatible)
>       Destroy filesystems asynchronously.
> empty_bpobj                           (read-only compatible)
>       Snapshots use less space.
> lz4_compress
>       LZ4 compression algorithm support.
> multi_vdev_crash_dump
>       Crash dumps to multiple vdev pools.
> spacemap_histogram                    (read-only compatible)
>       Spacemaps maintain space histograms.
> enabled_txg                           (read-only compatible)
>       Record txg at which a feature is enabled
> hole_birth
>       Retain hole birth txg for more precise zfs send
> extensible_dataset
>       Enhanced dataset functionality, used by other features.
> embedded_data
>       Blocks which compress very well use even less space.
> bookmarks                             (read-only compatible)
>       "zfs bookmark" command
> filesystem_limits                     (read-only compatible)
>       Filesystem and snapshot limits.
> large_blocks
>       Support for blocks larger than 128KB.
>
> The following legacy versions are also supported:
>
> VER  DESCRIPTION
> ---  --------------------------------------------------------
>   1   Initial ZFS version
>   2   Ditto blocks (replicated metadata)
>   3   Hot spares and double parity RAID-Z
>   4   zpool history
>   5   Compression using the gzip algorithm
>   6   bootfs pool property
>   7   Separate intent log devices
>   8   Delegated administration
>   9   refquota and refreservation properties
>   10  Cache devices
>   11  Improved scrub performance
>   12  Snapshot properties
>   13  snapused property
>   14  passthrough-x aclinherit
>   15  user/group space accounting
>   16  stmf property support
>   17  Triple-parity RAID-Z
>   18  Snapshot user holds
>   19  Log device removal
>   20  Compression using zle (zero-length encoding)
>   21  Deduplication
>   22  Received properties
>   23  Slim ZIL
>   24  System attributes
>   25  Improved scrub stats
>   26  Improved snapshot deletion performance
>   27  Improved snapshot creation performance
>   28  Multiple vdev replacements
>
> For more information on a particular version, including supported releases,
> see the ZFS Administration Guide.
>
> }}}
>
>> - Am i able to build a prooduction stable zfs filer with freebsd that
>> supports zfs snapshots for windows clients the same way OmniOS does.
> Yes.
>
> In fact, for NAS use, take a look at http://www.freenas.org/ which is a
> project built on FreeBSD and ZFS.
>
> 	Cheers,
>
> 	Matthew
>
>