Date: Tue, 29 Mar 2016 17:08:13 +0100 From: Matthew Seaman <matthew@FreeBSD.org> To: freebsd-questions@freebsd.org Subject: Re: FreeBSD ZFS snapshots and "previous versions" Message-ID: <56FAA86D.6070404@FreeBSD.org> In-Reply-To: <56FAA0B1.4000901@lightandshadow.tv> References: <56FAA0B1.4000901@lightandshadow.tv>
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From: Matthew Seaman <matthew@FreeBSD.org>
To: freebsd-questions@freebsd.org
Message-ID: <56FAA86D.6070404@FreeBSD.org>
Subject: Re: FreeBSD ZFS snapshots and "previous versions"
References: <56FAA0B1.4000901@lightandshadow.tv>
In-Reply-To: <56FAA0B1.4000901@lightandshadow.tv>
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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 release=
s,
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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