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Network File System Version 4 (Active WG)
Tsv Area: Mirja Kühlewind, Spencer Dawkins | 1998-Jul-30 —  
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IETF-102 nfsv4 minutes

Session 2018-07-16 0930-1200: Notre Dame - Audio stream - nfsv4 chatroom

Minutes

minutes-102-nfsv4-00 minute



          NFSv4 WG
          IETF 102, Montréal QC CA
          July 16, 2018
          
          Start 9:30
          6 in room
          6+ on meetecho
          ?? on a/v stream
          
          Blue sheet distributed, Note Well presented.
          Agenda not bashed
          
          Chuck Lever  IMA integrity
          
          Per-file integrity hash, of entire file
           Executables, stable file content
           End-to-end, computed above NFS and passed by NFS client
           Returned by NFS server for verification before execution
          Also applicable to certain file attributes
          Performance, scenarios discussed - to be part of the work
          Additional "file capabilities" possible (Linux)
           Focus of a later draft
           Implications on "namespace" - i.e.containers
          
          Discussion as to standardization of hash format(s), PKI infrastructure,
          other needed references
          
          Chuck Lever RPC/RDMA Crediting
          
          Review of RPC/RDMA crediting as today
           Credits are not "windowed" - typically a stable, constant number
           Adaptive, but only via recall
           Several other shortcomings listed in deck
          Goals for RPC/RDMA v2
           Larger (fragmented) inline request
           RDMA remote invalidation
           Cancelation of ongoing RPC transaction
           Larger RPC Reply
           Callback RPC parsing/management
          Possible "fixes"
           Listed in deck (and draft)
          Existing rpcrdmav2 draft is expired
          Consider concall to discuss ideas in deck, and update draft after
          
          Tom Haynes Open vs Deleg Stateid / Offline files / Getattr storm
          
          File browsers open file on hover to provide preview
           Very expensive - how to deal?
           Proposal - add an "offline" bit to suggest client not open file
          Clients may issue large number of getattr on write workloads
           Proxying - convert non-NFSv4.2 traffic ("FlexFile server")
           "Time proxying" - DS is not authoritative on times, so MDS still
           consulted (72K gatattrs on 40K writes!)
            MDS infers skew when client requests specific (new?) attribute(s)
          Open vs Delegation stateid
           Server needs to maintain extra state, which client may not need
           Make this explicit - client requests Open XOR Delegation stateid
            Note, MDS might return both, and client must handle if so
          Draft in review - please send comments
          Next draft ideally becomes a WG task
          Question - one draft or three? Suggestion: one.
          
          Dave Noveck Multiserver namespace
          
          Multiserver namespace history
           Areas to be addressed listed
            Trunking detection, trunking discovery, state migration, connection
            types
            For NFSv4.0, 4.1 and 4.2 (need for earlier versions to be revised?)
           Table of RFCs and mv0, mv1 drafts
          Migration issues history
           Common document for all minor versions
           draft-ietf-nfsv4-migration-issues-15 is current,but some issues possible
           remain
            rca_one_fs attribute handling tbd
           Details of vmware esx server discussion
          Discussion of WGLC process
           Is document done and publishable?
            it's a worthwhile doc with good content
            Unclear who would consume/implement it
           Opinion - WG should reach rough consensus on content, then larger
           decision on publication as Informational
          
          Trunking update
           MSNS draft moving toward -01, will request as WGLC
           Authors believe work is complete
          
          MSNS update
           -01 has been out about a month, needs discussion
           Is a conference call needed? Can do if so
           Current target March 2019 completion, meaning WGLC by January
           Desire to include rca_one_fs clarifications
          
          Dave Noveck NFSv4 WG milestones
          
          Many non-controversial tasks listed
          
          Flex files - may desire a small layout change
           This would require a layout type id change - heavy handed but required
           by layouts
           May need to discuss how to make this lighter weight
          NVMe for pNFS
           Author still interested, but no recent work
           Seeking momentum - should it remain on milestone list in
           interim? Consensus: yes
          pNFS RDMA Layout
           I-D is expired
           Some known issues, identified by Oracle researcher
           How realistic is date of 9/2019? TBD, should remain as milestone though
           NFSv4 WG could "take over" the draft, if needed/desired
          
          



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