Date: Sun, 6 Sep 2015 18:18:32 -0400 (EDT) From: Rick Macklem <rmacklem@uoguelph.ca> To: Jordan Hubbard <jordanhubbard@icloud.com> Cc: freebsd-fs@freebsd.org, Rakshith Venkatesh <vrock28@gmail.com> Subject: Re: CEPH + FreeBSD Message-ID: <838814506.1858817.1441577912291.JavaMail.zimbra@uoguelph.ca> In-Reply-To: <1564D4FA-9BE1-4E37-8E91-F14A009D6B62@icloud.com> References: <CANw0z%2BVhYCPNWrjByXLf8yO9wA0sc05_8eVJsM-McjcGNU9KQg@mail.gmail.com> <CA%2BKW7xQrN60kH37hu2Keja60a0huVjAyP6=SQNSrqus2EUMUMA@mail.gmail.com> <CANw0z%2BXrwK=6y%2BLpoiewc_eLDBYB5UZ5XpU6-YP0-K2FKwSa5w@mail.gmail.com> <A19FDEB5-1DEF-4EBF-8E9E-A1AD4688F1AA@icloud.com> <100306673.40344407.1441279047901.JavaMail.zimbra@uoguelph.ca> <1564D4FA-9BE1-4E37-8E91-F14A009D6B62@icloud.com>
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Jordan Hubbard wrote: > > > On Sep 3, 2015, at 4:17 AM, Rick Macklem <rmacklem@uoguelph.ca> wrote: > > > > Slightly off topic but, btw, there is a port of GLusterFS and those folks > > do seem > > interested in seeing it brought "up to speed". I am not sure how mature it > > is at > > this point, but it has been known to build on amd64. (I don't have an amd64 > > machine, > > so I haven't gotten around to building/testing it, but I do plan to try and > > use > > it as a basis for a pNFS server, if I can figure out how to get the FH info > > out of it. > > I'm working on that;-) > > There are at least two distributed (multi-node) object stores for FreeBSD > that I know of. > > One is glusterfs, for which I’m not even really clear on the status of the > ports for. I don’t see any glusterfs port in the master branch of > https://github.com/freebsd/freebsd-ports (or > https://github.com/freebsd/freebsd-ports/tree/branches/2015Q3 for that > matter). > > Our FreeNAS ports tree (https://github.com/freenas/ports), in which we have a > bit more latitude to add and curate our own ports, has both a net/glusterfs > and sysutils/glusterfs, from separate sources (looks like we need to clean > things up) - net/glusterfs lists craig001@lerwick.hopto.org as the > MAINTAINER and is at version 3.6.2. The sysutils/glusterfs port lists > bapt@FreeBSD.org as the MAINTAINER and is at version 20140811. > > I’m not really sure about the provenance since we were simply evaluating > glusterfs for awhile and may have pulled in interim versions from those > sources, but obviously it would be best to have an official maintainer and > someone in the FreeBSD project actually curating a glusterfs port so that > all users of FreeBSD can use it. It would also be fairly key to your own > efforts, assuming you decide to pursue glusterfs as a foundation technology > for pNFS. > > The other object store, which is pretty mature and is currently leading the > pack (of two :) ) for inclusion into FreeNAS is RiakCS from Basho. There is > a port currently in databases/riak but it’s pretty out of date at version > 1.4.12 (the current version is 2.0.1, with 2.0 being a major upgrade of > RiakCS). > > We are very interested in investigating various ways of shimming RiakCS to > NFS, using RiakCS a back-end store. Is that something you’d be amenable to > discussing? I’d be happy to send you an amd64 architecture machine to > develop on. :) > Hmm. From a quick look at their web page (I looked once before as well), I don't think RiakCS has what I need to do pNFS in a reasonable (for me) amount of effort. Two things that glusterFS has that I am hoping to use (and I don't think RiakCS has either of these) are: - A Fuse file system interface which allows the kernel nfsd to access the store as a file system, so that it can provide the metadata services (NFS without the reads/writes). - A userland NFSv3 server in each node which will allow the node to act as a data server. If I am wrong and RiakCS does support a VFS file system interface (via Fuse or ???), then please correct me. With that, it might be a reasonable alternative. I'll admit I've spent a little time looking at the glusterFS sources and haven't yet solved the problem of how to generate the file handles I need, but that sounds trivial compared with an entire Fuse and/or VFS file system interface, I think? In general, using a cloud object store to implement a pNFS server is a *mis*use of the technology, imho. I think it may be possible with glusterFS, since that technology seems to be based on a cluster file system, which is what a pNFS server can also use. I think there would be a lot of work involved in mapping a POSIX file system onto the Riak database and then exporting that via NFS, etc. It might also be more practical to do this via a userland NFS service than the kernel based one currently in FreeBSD. (glusterFS is starting to use the NFS-ganesha server, but I believe it is pretty Linux specific, so I doubt it would be useful for Riak running on FreeBSD?) rick > - Jordan > >
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