Date: Tue, 29 Mar 2016 23:42:14 +0200 From: Dennis Steinkamp <dennis@lightandshadow.tv> To: <freebsd-questions@freebsd.org> Subject: Re: FreeBSD ZFS snapshots and "previous versions" Message-ID: <56FAF6B6.9070300@lightandshadow.tv> In-Reply-To: <56FAA86D.6070404@FreeBSD.org> References: <56FAA0B1.4000901@lightandshadow.tv> <56FAA86D.6070404@FreeBSD.org>
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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
>
>
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