Date: Fri, 1 Jun 2012 21:19:15 -0700 From: Freddie Cash <fjwcash@gmail.com> To: Glen Barber <gjb@freebsd.org> Cc: David Magda <dmagda@ee.ryerson.ca>, freebsd-stable@freebsd.org Subject: Re: Why Are You NOT Using FreeBSD ? Message-ID: <CAOjFWZ7rq_NaAdaKL6Woi-ATy390ax20KWO=V_Jpf9-vJWwgLg@mail.gmail.com> In-Reply-To: <20120602032529.GE1377@glenbarber.us> 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> <4D744565-4073-485E-B769-82BE1F7E2C0A@ee.ryerson.ca> <20120602032529.GE1377@glenbarber.us>
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On Jun 1, 2012 8:27 PM, "Glen Barber" <gjb@freebsd.org> wrote: > > On Fri, Jun 01, 2012 at 11:14:10PM -0400, David Magda wrote: > > 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. > > > > Pardon my ignorance to not knowing what gluster is, but is this > conceptually similar to HAST? Similar in concept, but different layers in the storage stack. HAST sits between the physical disks and the filesystem, replicating data between two systems. So, disks -- HAST -- ZFS. Glustre sits above the storage system, replicating data between systems. So, disks -- ZFS (via Zvols) -- Glustre. The primary difference is that HAST provides only a single master node that all I/O goes through. The filesystem(s) above HAST cannot be mounted on more than one host. I/O is limited to what the master can handle. Glustre is distributed across hosts, so I/O is multiplied (to some extent), and data is accessible across multiple hosts.
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