Date: Tue, 04 Jan 2022 07:42:39 +0100 From: Alexander Leidinger via freebsd-current <freebsd-current@freebsd.org> To: freebsd-current@freebsd.org Subject: Re: [RFC] Making mount_nfs to attempt NFSv4 before NFSv3 and NFSv2? Message-ID: <20220104074239.Horde.lTehmFlQWMv_N_QIcF1h1Wq@webmail.leidinger.net> In-Reply-To: <YQXPR0101MB0968ECB48F192ABA86AF3DFFDD4A9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> References: <dc6de81f-ce20-a772-18b6-d94a3aea97e1@delphij.net> <20220104090747.7767144800c564ca2cff43d5@dec.sakura.ne.jp> <YdO5Tj4CwX7fIKb8@kib.kiev.ua> <YQXPR0101MB0968ECB48F192ABA86AF3DFFDD4A9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM>
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Quoting Rick Macklem <rmacklem@uoguelph.ca> (from Tue, 4 Jan 2022 03:18:36 +0000): > Konstantin Belousov wrote: > [good stuff snipped] >> The v4 NFS is very different from v3, it is not an upgrade, it is rather >> a different network filesystem with some (significant) similarities to v3. >> >> That said, it should be fine changing the defaults, but you need to ensure >> that reasonable scenarios, like the changed FreeBSD client mounting >> from v3-only server, still work correctly. The change should be made in a >> way that only affects client that connects to the server that has both >> v4 and v3. > A particular test case that needs to be done is the diskless NFS root fs. > This case must use NFSv3 and if it is not the default, it might break? > I am not really set up to test this at this time. > (There are assorted reasons that NFSv4 does not, or at least might not, > work for a diskless root fs, but that is a separate topic.) > > Other than testing diskless NFS root file systems, I do not have a > strong opinion w.r.t. whether the default should change. > > If the default stays as NFSv3, a fallback to NFSv4 could be done, which > would handle the NFSv4 only server case. (No one uses NFSv2 any more, > so the fallback to NFSv2 is almost irrelevant, imho.) As you particiate in interoperability tests, would it make sense to check how those other implementations handle this case? I naively assume you have some contacts or a mailinglist you could use for that. Bye, Alexander. -- http://www.Leidinger.net Alexander@Leidinger.net: PGP 0x8F31830F9F2772BF http://www.FreeBSD.org netchild@FreeBSD.org : PGP 0x8F31830F9F2772BF
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