tailieunhanh - Red Hat Linux Networking and System Administration Third Edition phần 4

Nếu nó không phải là có thể sử dụng nhiều máy chủ, ít nhất là cố gắng để situate xuất khẩu NFS trên đĩa vật lý riêng biệt và / hoặc trên các bộ điều khiển đĩa riêng biệt. Làm như vậy làm giảm đĩa I / O xác định các hệ thống tập tin xuất khẩu, | The Network File System 273 Similarly overall disk and network performance improves if you distribute exported file systems across multiple servers rather than concentrate them on a single server. If it is not possible to use multiple servers at least try to situate NFS exports on separate physical disks and or on separate disk controllers. Doing so reduces disk I O contention. When identifying the file systems to export keep in mind a key restriction on which file systems can be exported and how they can be exported. You can export only local file systems and their subdirectories. To express this restriction in another way you cannot export a file system that is itself already an NFS mount. For example if a client system named userbeast mounts home from a server named homebeast userbeast cannot reexport home. Clients wishing to mount home must do so directly from homebeast. Configuring an NFS Server This section shows you how to configure an NFS server identifies the key files and commands you use to implement maintain and monitor the NFS server and illustrates the server configuration process using a typical NFS setup. On Fedora Core and Red Hat Enterprise Linux systems the etc exports file is the main NFS configuration file. It lists the file systems the server exports the systems permitted to mount the exported file systems and the mount options for each export. NFS also maintains status information about existing exports and the client systems that have mounted those exports in var lib nfs rmtab and var lib nfs xtab. In addition to these configuration and status files all of the daemons commands initialization scripts and configuration files in the following list are part of NFS. Don t panic because the list is so long though you have to concern yourself with only a few of them to have a fully functioning and properly configured NFS installation. Notice that approximately half of the supporting files are part of NFSv4 presumably the price one pays for added .