Date: Tue, 24 Apr 2018 08:14:32 +0200 From: Karli =?ISO-8859-1?Q?Sj=F6berg?= <karli@inparadise.se> To: Rick Macklem <rmacklem@uoguelph.ca>, "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org> Subject: Re: pNFS server completed Message-ID: <1524550472.1130.10.camel@inparadise.se> In-Reply-To: <YQBPR0101MB104218411EF6ABD1B660DEBDDD890@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> References: <YQBPR0101MB1042CB0BF460C68A908D9340DD8A0@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> ,<1524471526.9560.51.camel@inparadise.se> <YQBPR0101MB104218411EF6ABD1B660DEBDDD890@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM>
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On Mon, 2018-04-23 at 21:00 +0000, Rick Macklem wrote: > Karli Sjöberg wrote: > > > > On Sun, 2018-04-22 at 21:18 +0000, Rick Macklem wrote: > > > > > > Hi, > > > > > > I have now updated the projects/pnfs-planb-server subtree of svn > > > with > > > what > > > I believe is a complete pNFS server. It now handles mirrored Data > > > Servers (DSs) > > > and recovery of a failed mirrored DS while the service is > > > operational. > > > It handle non-pNFS clients (such as NFSv3 mounts) via having the > > > MetaData > > > Server act as a proxy for Read/Write operations. > > > For pNFS capable NFSv4.1 clients, the Read/Write operations are > > > done > > > directly > > > on the appropriate DS(s), avoiding the MetaData Server (which act > > > like a normal > > > NFS server except for pNFS capable clients). > > > > > > If you are interested in more information or doing testing, see: > > > http://people.freebsd.org/~rmacklem/pnfs-planb-setup.txt > > > > > > I hope that this should be ready for head/current with some > > > additional testing. > > > I will post here asking the "collective" about this when I think > > > it > > > is ready. > > > > > > If there are any volunteers on the doc side who would like to > > > turn > > > the above > > > text file into a useful document, that would be greatly > > > appreciated. > > > > > > Good luck with it, if you test it, rick > > Hi Rick! > > > > I think this sounds amazing to have a distributed file server > > natively > > in FreeBSD, awesome! > > > > One question that comes to mind is about the MDS: wouldn´t that be > > a > > SPOF? > Yes, the MDS is just like a regular NFS server on FreeBSD. It is a > single point > of failure. > > > > > Maybe that has already been discussed and explained and I´ve just > > missed it, but would be nice to know. And if it is a SPOF, are > > there > > any plans of also mirroring MDS's as well? Perhaps a DS can be MDS > > to, > > something like that? > No plans w.r.t. mirroring the MDS. The pNFS client using Flexible > File Layout > knows to write to both mirrors (and the MDS can do so acting as a > proxy > for a client). > > However, NFS clients don't know how to do NFS operations on multiple > NFS servers. As such, any mirroring would have to be implemented > "behind the > curtain" and I'll admit I don't know how to do that. > > I did try using a clustered file system (GlusterFS) as a backend when > I first > implemented a pNFS server two years ago, but that was a failure, due > to > terrible performance. (Using a clustered file system as a storage > backend would > make multiple NFS servers/MDSs more feasible, but it didn't work.) > > rick OK, I think I understand, thank you for the explanation! So you could say that this enhancement is more about the performance benifit of scaling out, rather than resiliance/tolerance? /K
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