Max size of R2 DFS

Discussion in 'File Systems' started by G Park 3, Sep 7, 2006.

  1. G Park 3

    G Park 3 Guest

    Hello,

    According to KB840675 the maximum limit for DFS/FRS data under 2000 or 2003
    servers is 64Gb.

    If this is the case (assume this limit is for all data although with a max
    staging area size of 2TB perhaps the max is not per root but something else)
    what are the limits under R2 DFS?

    The total data I would be looking to replicate between two geographically
    diverse Windows servers would be at least 600Gb today to 2TB in the next two
    years.
     
    G Park 3, Sep 7, 2006
    #1
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  2. http://technet2.microsoft.com/Windo...7326bd76-2904-4cd2-95cb-1fc0052095891033.mspx

    DFS Replication scalability guidelines
    Updated: July 25, 2006
    DFS Replication is a highly scalable replication engine that was built to
    efficiently replicate large sets of content over wide area networks. The
    following list provides a set of scalability guidelines that have been
    tested by Microsoft:

    • Each server can be a member of up to 256 replication groups.

    • Each replication group can contain up to 256 replicated folders.

    • Each server can have up to 256 connections (for example, 128 incoming
    connections and 128 outgoing connections).

    • On each server, the number of replication groups multiplied by the number
    of replicated folders multiplied by the number of simultaneously active
    connections must be kept to 1024 or fewer.

    • A replication group can contain up to 256 members.

    • A volume can contain up to 8 million replicated files, and a server can
    contain up to 1 terabyte of replicated files.

    • The maximum tested file size is 64 gigabytes.

    ====

    Now, my long-winded clarification on the file size bullets:

    - The 8 million file, 1 terrabyte limit

    DFSR has no real limit on the size of files that can be replicated.
    The DFSR Jet database has a theoretical limit of 32TB, with roughly 8TB
    available
    for file ID records.
    The assumption in the limit is that with a file ID records taking up to 1KB
    at
    most, the upward practical limit would be 8 million files.
    In practical experience at MS, 50 million files have been replicated in one
    2-server replication group - the Jet DB takes up 20GB, and the data over
    1TB - as
    you can see here, the 1K max size of each file ID record is not shown to be
    common
    in reality.

    The real limitation here with 8 million files would be performance - the MS
    example
    above is primarily static data.
    Some factors noted by Dev that can affect replication performance with this
    many
    files:

    * Bandwidth throttling settings
    * Speed of the network
    * Ability to compress changes using RDC and whether cross-file RDC is used
    * Size of the staging folder quota
    * Speed of the disk subsystem
    * Whether you have optimized the servers by placing the replicated folder
    and
    staging folders on separate disks

    - The 64GB file size limit

    This is just the largest file size that was tested. With a properly sized
    staging
    area, it's conceivable that the file could be much larger. typically, files
    that
    large are databases, which should not be replicated.

    ====

    All make sense?


    --

    Ned Pyle
    Microsoft Enterprise Platforms Support

    All postings on this newsgroup are provided "AS IS" with no warranties, and
    confer no rights.
    For more information please visit
    http://www.microsoft.com/info/cpyright.mspx to find terms of use.
     
    Ned Pyle [MSFT], Sep 7, 2006
    #2
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  3. G Park 3

    G Park 3 Guest

    Makes perfect sense, thanks for taking the time to explain it.

    Regards,
    gp
     
    G Park 3, Sep 7, 2006
    #3
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