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From:   NeilBrown <neilb@suse.com>
To:     Tom Talpey <tom@talpey.com>, Olga Kornievskaia <aglo@umich.edu>,
        Chuck Lever <chuck.lever@oracle.com>
Date:   Wed, 12 Jun 2019 08:55:40 +1000
Cc:     Anna Schumaker <Anna.Schumaker@netapp.com>,
        Trond Myklebust <trondmy@hammerspace.com>,
        Linux NFS Mailing List <linux-nfs@vger.kernel.org>
Subject: Re: [PATCH 0/9] Multiple network connections for a single NFS mount.
In-Reply-To: <e33a22ef-b335-36e1-ea7f-2d2b5b2ed390@talpey.com>
References: <155917564898.3988.6096672032831115016.stgit@noble.brown> <001DED71-0E0D-46B1-BA34-84E6ACCBB79F@oracle.com> <87muj3tuuk.fsf@notabene.neil.brown.name> <4316E30B-1BD7-4F0E-8375-03E9F85FFD2B@oracle.com> <87lfy9vsgf.fsf@notabene.neil.brown.name> <3B887552-91FB-493A-8FDF-411562811B36@oracle.com> <CAN-5tyEdu7poNWrKtOyic6GgQcjAPZhB5BJeQ7JMSfmgMx8b+g@mail.gmail.com> <16D30334-67BE-4BD2-BE69-1453F738B259@oracle.com> <CAN-5tyHQz4kyGqAea3hTW0GKRBtkkB5UeE6THz-7uMmadJygyg@mail.gmail.com> <ac631f3c-af1a-6877-08b6-21ddf71edff2@talpey.com> <A74B7E29-CAC7-428B-8B29-606F4B174D1A@oracle.com> <CAN-5tyFP9qK9Tjv-FCeZJGMnhhnsZh0+VCguuRaDOG2kB9A-OQ@mail.gmail.com> <e33a22ef-b335-36e1-ea7f-2d2b5b2ed390@talpey.com>
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On Tue, Jun 11 2019, Tom Talpey wrote:

> On 6/11/2019 5:10 PM, Olga Kornievskaia wrote:
...
>>=20
>> Solaris has it, Microsoft has it and linux has been deprived of it,
>> let's join the party.
>
> Let me be clear about one thing - SMB3 has it because the protocol
> is designed for it. Multichannel leverages SMB2 sessions to allow
> retransmit on any active bound connection. NFSv4.1 (and later) have
> a similar capability.
>
> NFSv2 and NFSv3, however, do not, and I've already stated my concerns
> about pushing them too far. I agree with your sentiment, but for these
> protocols, please bear in mind the risks.

NFSv2 and NFSv3 were designed to work with UDP.  That works a lot like
one-connection-per-message.   I don't think there is any reason to think
NFSv2,3 would have any problems with multiple connections.

NeilBrown

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