Date: Fri, 1 Jun 2012 23:14:10 -0400 From: David Magda <dmagda@ee.ryerson.ca> To: Chris Nehren <apeiron+freebsd-stable@isuckatdomains.net> Cc: freebsd-stable@freebsd.org Subject: Re: Why Are You NOT Using FreeBSD ? Message-ID: <4D744565-4073-485E-B769-82BE1F7E2C0A@ee.ryerson.ca> In-Reply-To: <20120602010346.GA27660@isuckatdomains.members.linode.com> References: <CAOgwaMvsv3e1TxDauV038Pp7LRiYeH7oAODE%2Bw-pxHt9oGrXMA@mail.gmail.com> <20120601121555.GF5335@home.opsec.eu> <4FC8B67D.5090208@digsys.bg> <20120601131236.GJ8591@macbook.bluepipe.net> <20120602010346.GA27660@isuckatdomains.members.linode.com>
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On Jun 1, 2012, at 21:03, Chris Nehren wrote: > You say your'e using ZVOLs but then recommend gluster for large > filesystems. I would like to take a moment to point out that one of = the > design goals of ZFS was to scale beyond the capabilities of current > hardware.=20 >=20 > What does gluster do that ZFS does not? I'm not trying to troll here, > but am genuinely curious about ZFS's shortfalls in one of the problem > domains it seeks to address. ZFS is for storing file systems on locally connected block devices. = Gluster is a network file system where data can be distributed over many = nodes. So ZFS can ensure that bits-on-disk stay safe through checksums and = mirroring / RAIDZ, while Gluster allows entire file servers to go = offline and the files are still accessible because you have a kind of = network-level RAID going on. This also helps in performance since = instead of clients pounding on one file server (as usually happens with = NFS), every write is sent to many data nodes so you're striping across = many network elements. Think of it as NFS on steroids. A competitive open source equivalent would be Lustre, while Isilon and = Panasas would probably be commercial alternatives (though they do NFS / = CIFS on the 'front-end' and the distributed "magic" occurs on a = 'back-end' network between the appliances). http://en.wikipedia.org/wiki/GlusterFS http://en.wikipedia.org/wiki/Lustre_(file_system)
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