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Date:      Tue, 02 Dec 2008 20:04:04 +0100
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-questions@freebsd.org
Subject:   Re: Disenchanted with ZFS; alternatives?
Message-ID:  <gh40r9$n66$1@ger.gmane.org>
In-Reply-To: <20081202110922.T14849@wojtek.tensor.gdynia.pl>
References:  <200812010959.15647.kirk@strauser.com> <gh1erh$n6s$1@ger.gmane.org>	<4934E276.3050308@comcast.net>	<9bbcef730812020120w539a8f14jc496b14c2fbd52ad@mail.gmail.com> <20081202110922.T14849@wojtek.tensor.gdynia.pl>

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Wojciech Puchar wrote:
>>
>>> What about DragonFlyBSD's new HAMMER FS?  I hear it has similar
>>> capabilities
>>> as ZFS without the overhead.  Though, strangely, I haven't really hea=
rd
>>> anyone discuss it even though it was released some months ago.
>=20
> it's maybe pre-pre-prerelease.
>=20
> it's not finished yet.

I don't think HAMMER intends to implement a significant portion of ZFS's
features. In particular, IIRC Matt specifically said he won't do
anything about volume management (the data storage / RAID layer of ZFS)
which among many other things means no ad-hoc file system creation.
Also, HAMMER needs to be "vacuumed" periodically by design (the reason
for this seems to me similar to that of pgsql) which isn't a
particularly nice design.


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