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Network home folders are structured identically to local home folders. They contain the same subdirectories that perform the exact same function. The difference between the two lies in where a user s data is stored. When a user with a local home directory logs into a computer, that user s home directory will be stored on that computer s hard drive. Any new files that the user creates will be stored locally to that drive. When that user later logs into a different computer, they will not have access to any files created on a different computer. If your users move from computer to computer, this creates a problem. It s certainly possible to enable file sharing on all of the workstations, so users could connect to the other computer and access their data, but this quickly turns into an unmanageable nightmare. Users need to remember which computer has which document. Those documents will get duplicated and version tracking will go out the window. Your users will be miserable, and you, in turn, will be miserable. Most often, a centralized file server comes into play, offering users the ability to upload their files and then they will be able to access them from different nodes by connecting to that server. The central flaw here is that it promotes the illusion that data is centralized. Often times
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CHAPTER 7: Client Management
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in these scenarios, desktop resident data is completely forgotten. If it s not on the server, it doesn t exist, and doesn t require protection. This mind-set can lead to expensive mistakes because your data is only as protected as your users are regimented. Enter network home folders. Network home folders store data on a network file server. (It s not just a clever name.) When a user logs into a computer, the user s home directory is never stored on that local machine, but rather directly referenced from a remote network file server. When a user creates or edits documents, those documents are actually updated on a remote server. This all happens transparently, unbeknownst to the user. The main benefit provided by this is mobility. By freeing user data from the embrace of each individual workstation, users are capable of freely moving from node to node, traveling with them their entire computing experience. If your organization does not use assigned workstations, with network home directories, your users will enjoy a single experience wherever they login. The benefits of this experience are reaped by IT as well. The advantage of having all user data centralized on the home directory server(s) is not small. Indeed, the ability to mass deploy software, settings, files, audit security, and provide data protection are all greatly increased when data is consolidated. OS X currently supports home directories over a handful of network file protocols, such as AFP, SMB, as well as NFS. AFP is your native protocol and will typically be your first choice when available. SMB support has greatly improved in OS X over the years, and can be utilized for an acceptable experience as well, though it will typically be relegated to environments with Windows-based file servers. NFS flaws are traditional to the protocol, security being the primary barrier. However, the introduction of Kerberized NFS in 10.5 provides improvement here, trusting your environment globally supports it. The network home folder model is not without its flaws. The largest barrier to entry is the necessary server-side resources needed to provide an acceptable computing experience, let alone approach the performance provided by fast local storage used by local homes. Robust server, network, and storage infrastructure are needed. Gigabit Ethernet to the desktop will help and to the server is also highly recommended. A dedicated Intel Xserve with fast external RAID storage and gigabit Ethernet can acceptably host 40--50 simultaneous light to moderate users when implemented properly. This is not a hard limit or a guarantee because the qualification for acceptable performance will vary greatly from workflow to workflow and from user to user. If performance is paramount in your environment, or if you are unfortunate enough to host particularly feisty users, then the decision to migrate to network home folders should not be taken lightly. Special consideration must be paid to your user s workflow to identify data usage patterns, which can be detrimental to a file server. Economies of scale play a large role here. If all of your users run applications that are IO heavy, then all of those transactions hit the wire, and your server will begin to lag. Likewise, if your users are in the habit of dealing with large data sets, then even a gigabit pipe on a server can be easily saturated. Luckily, Mac OS X supports 802.3ad link aggregation, also referred to as NIC bonding. This is the process of taking two network interfaces on a server, and presenting them to the network as a single unified connection. This provides benefits both in redundancy and in throughput. It doesn t offer perfect 50/50 load balancing,
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