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Distributed File System at DAPNIA Dora Merelli Joël Surget 24.4.2001
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DFS: why? §Just for the classical reasons: ¦ A single name space ¦ Independent from the physical location of data
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DFS Root §Domain-based DFS ¦ Possibility to have Root Replicas ¦ DFS topology in Active Directory ¦ DFS server name = domain name \\DAPNIA\data
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DFS root servers § 2 DFS root servers = 2 domain controllers §On each root server, a network share is created, named as the DFS root; for each DFS link, a folder is created under the share §ExampleExample
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The DFS tree (1) §For each user: ¦ \\dapnia\data\users\user-name ` \\dapdc5\users\user-name ¦ \\dapnia\data\users\user-name_pub ` \\dapnia\data\users\user-name\public ¦ \\dapnia\data\scratch\user-name ¦ \\dapnia\data\profiles\user-name ¦ \\dapnia\data\dapdiv\user-name ` \\dapnt5\user-name
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The DFS tree (2) §\\dapnia\data\produits For all distributions, including Group Policy deployed applications
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Another DFS link exemple §\\dapnia\data\manip\CaoMeca\Catia\Doc_R4f ¦ \\sgpipcz19\b04fdoc §\\dapnia\data\manip\CaoMeca\Catia\Doc_R5 ¦ \\sgpipcz19\b05doc §\\dapnia\data\manip\CaoMeca\Projets ¦ \\dapdc5\manip\CAOProjets §ExampleExample
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From the user point of view … §My Documents : Group Policy \\dapnia\data\users\user_name\My Documents §J: home directory \\dapnia\data\users\user-name §Logon Script (Braunschweig meeting) ¦ K: connected to \\dapnia\data\scratch\user-name ¦ N: connected to \\dapnia\data\dapdiv\user-name ¦ Network Place: DFS root (data on dapnia …) ` Script Script §ExampleExample
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To manage the DFS tree (1) § "Distributed file system" snap-in ¦ Define/delete DFS links ¦ Check link status ¦ Define root replicas ¦ Check root replicas status Example
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To manage the DFS tree (2) §DFSCMD command-line tool ¦ Comes with the DFS server installation ¦ Allows to completely manage a DFS tree: ` /map ` /unmap ` /view ` /view \batchrestore Output a batch file to recreate the DFS using the /restore switch Example
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Clients §Windows 2000 §Windows NT4 sp4 in the same domain (?) §W95/98/Me with DFS Client in the same domain (?) §Does not work with NT4 in another domain (sp7 needed)
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Problems §Slow §If one of the servers goes offline, clients are disconnected … §DFS tree corruption (important to regularly execute: dfscmd /view \batchrestore) §Problems mapping network drives to dfs links when home directory points to a dfs link
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