Best web design - 670 Part V . Running Servers The default
670 Part V . Running Servers The default is to mount an NFS file system as read/write. However, the default for exporting a file system is read-only. If you are unable to write to an NFS file system, check that it was exported as read/write from the server. Mounting noauto File Systems Your /etc/fstab file contains devices for other file systems that are not mounted automatically (probably /dev/cdrom and /dev/fd0, for your CD-ROM and floppy disk devices, respectively). The noauto option for these devices is what prevents them from being mounted at boot time. A noauto file system can be mounted manually when you need it. The advantage is that when you type the mount command, you can type less information and have the rest filled in by the contents of the /etc/fstab file. For example, you could type: # mount /oak/apps With this command, mount knows to check the /etc/fstab file to get the file system to mount (oak:/apps), the file system type (nfs), and the options to use with the mount (in this case ro for read-only). Instead of typing the local mount point (/oak/apps), you could have typed the remote file system name (oak:/apps) and had other information filled in. When naming mount points, including the name of the remote NFS server in that name can help you remember where the files are actually being stored. This may not be possible if you are sharing home directories (/home) or mail directories (/var/spool/mail). For example, you might mount a file system from a machine called duck on the directory /mnt/duck. Using mount Options You can add several mount options to the /etc/fstab file (or to a mount command line itself) to influence how the file system is mounted. When you add options to /etc/fstab, they must be separated by commas. The following are some options that are valuable for mounting NFS file systems: . hard If this option is on and the NFS server disconnects or goes down while a process is waiting to access it, the process will hang until the server comes back up. This is helpful if it is critical that the data you are working with not get out of sync with the programs that are accessing it. (This is the default behavior.) . soft If the NFS server disconnects or goes down, a process trying to access data from the server will time out after a set period of time when this is on. An input/output error is delivered to the process trying to access the NFS server. . rsize The number of bytes of data read at a time from an NFS server. The default is 1024. Using a larger number (such as 8192) will get you better performance on a network that is fast (such as a LAN) and is relatively error-free (that is, one that doesn t have a lot of noise or collisions). . wsize The number of bytes of data written at a time to an NFS server. The default is 1024. Performance issues are the same as with the rsize option. Tip Tip
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