Date: Tue, 24 Apr 2018 12:36:24 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: "freebsd-fs@freebsd.org" <freebsd-fs@freebsd.org>, "karli@inparadise.se" <karli@inparadise.se> Subject: Re: pNFS server completed Message-ID: <YQBPR0101MB104267CADDD5EA9758B88EEFDD880@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <1524550472.1130.10.camel@inparadise.se> References: <YQBPR0101MB1042CB0BF460C68A908D9340DD8A0@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM> ,<1524471526.9560.51.camel@inparadise.se> <YQBPR0101MB104218411EF6ABD1B660DEBDDD890@YQBPR0101MB1042.CANPRD01.PROD.OUTLOOK.COM>, <1524550472.1130.10.camel@inparadise.se>
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Karli Sjöberg wrote: [stuff snipped] >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? Yes, although without the DS mirroring (which is optional and doesn't have to be done), you would go from one SPOF to N SPOFs. To be honest, this pNFS service will not be useful for many. Only people who need to scale out beyond the limits of one NFS server and find it more convenient that creating a second NFS server. Improving resiliance/tolerance for an NFS server is a separate topic (and would apply to the MDS of this pNFS service as well). I don't have any expertise w.r.t. this, but something like HA (which I just learned about from the email thread) might be appropriate. If you can build a storage subsystem with internal redundancy (raid at the drive level) and then have two servers "attached" to the storage subsystem so that it can fail over from the 1st to 2nd server, that would be a good start. With that, you would just need to have something that would tell the nfs servers to start/stop when the HA failover happens, I think? This is a really interesting problem, but not one for me. Of course if someone gets to the point where it needs an nfsd tweak to make the fail over work, I could help with that. Thanks for your interest, rickhome | help
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