Date: Tue, 4 Jan 2022 03:18:36 +0000 From: Rick Macklem <rmacklem@uoguelph.ca> To: Konstantin Belousov <kostikbel@gmail.com>, Tomoaki AOKI <junchoon@dec.sakura.ne.jp> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>, "d@delphij.net" <d@delphij.net>, "rmacklem@freebsd.org" <rmacklem@freebsd.org>, "re@FreeBSD.org Engineering Team" <re@freebsd.org> Subject: Re: [RFC] Making mount_nfs to attempt NFSv4 before NFSv3 and NFSv2? Message-ID: <YQXPR0101MB0968ECB48F192ABA86AF3DFFDD4A9@YQXPR0101MB0968.CANPRD01.PROD.OUTLOOK.COM> In-Reply-To: <YdO5Tj4CwX7fIKb8@kib.kiev.ua> References: <dc6de81f-ce20-a772-18b6-d94a3aea97e1@delphij.net> <20220104090747.7767144800c564ca2cff43d5@dec.sakura.ne.jp> <YdO5Tj4CwX7fIKb8@kib.kiev.ua>
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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.) rickhome | help
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