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Linux

Linux/NFS. Current status of Linux/NFS in v2.2NFS v2NFS v3NFS v4Some comparisions of NFS V2 vs. NFS V3Linux/NFS links/mailing list information.. Status. Linux v2.2.12 only has NFS V2 client/server support.kNFSD is broken in all v2.2 kernels.NFS V3 support is available via patchesWill never

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Linux

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    1. Linux/NFS

    2. Linux/NFS Current status of Linux/NFS in v2.2 NFS v2 NFS v3 NFS v4 Some comparisions of NFS V2 vs. NFS V3 Linux/NFS links/mailing list information.

    3. Status Linux v2.2.12 only has NFS V2 client/server support. kNFSD is broken in all v2.2 kernels. NFS V3 support is available via patches Will never be in V2.2. Doubtful appearance in v2.4 (Linus doesn't like read-ahead/write caching code) NFS V4 is still in "embryo" stage.

    4. Status (more) Linux

    5. V2 Performance NFS V2 performance against Solaris is bad. Can be improved by: Disk subsystem (raid0, raid5 is faster than a single drive) Lots of ram (for caching) Applying NFS v3 clients to Linux kernel

    6. Performance (continued) Sample NFS v2 performance: -------Sequential Output-------- -Per Char- --Block--- -Rewrite-- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU pdsfdv08 1024 1392 20.6 1342 3.1 1746 7.4 ---Sequential Input-- --Random-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU /sec %CPU pdsfdv08 1024 3894 54.0 7964 11.8 115.5 2.4

    7. NFS V3 Performance Available only as a patch Some bonnie results -------Sequential Output-------- -Per Char- --Block--- -Rewrite-- Machine MB K/sec %CPU K/sec %CPU K/sec %CPU pdsfdv08 1024 4096 59.1 6127 6.5 3310 7.0 ---Sequential Input-- --Random-- -Per Char- --Block--- --Seeks--- Machine MB K/sec %CPU K/sec %CPU /sec %CPU pdsfdv08 1024 6231 94.9 9780 7.5 141.2 2.8

    9. Kernel NFSD Kernel based NFS Supports file locking! Much faster! Has passed connectathon tests! (with patches) Sadly, off-the-shelf Linux v2.2.12 kernel still needs patches to interoperate correctly with other NFS clients properly.

    10. Known nfsd problems Must export all filesystems - can't do just one, and other points in tree automatically exported. Has problems talking Solaris older than v2.6 See patch-ID # 105299-02 for details. Can only export local file systems Can't re-export NCPFS, SMBFS, Appletalk file systems.

    11. Links/Mailing list NFS links NFS v3 client/mount: http://www.fys.uio.no/~trondmy/src/ NFS v2 knfsd patches: ftp://ftp.us.kernel.org/pub/linux/gcc/devel NFS v3 knfsd patches:http://csua.berkeley.edu/~gam3/knfsd/ NFS Mailing list http://lists.varesearch.com/lists/listinfo/nfs

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