HP ProLiant DL380G5-WSS 3.7.0 HP StorageWorks HP Scalable NAS File Serving Sof - Page 193
Client mount options, and each try waits for
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Client mount options Soft and hard mounts can be characterized by how they handle errors. • Hard: When an NFS client with a hard-mounted share requests a file, it keeps trying until either it succeeds or someone interrupts its attempts. You can use the intr and nointr options to specify whether you want users to be able to interrupt an NFS request. • Soft: When an NFS client with a soft-mounted share requests a file, it tries to receive the file a specified number of times (retrans) and each try waits for a specified amount of time (timeo). After this, if the file has not been received, NFS will return an I/O error to the process on the client machine requesting the file. Following are some of the important parameters: Hard Mount Parameters: intr Specify intr if users are not likely to damage critical data by manually interrupting an NFS request. If a hard mount is interruptible, a user can press Ctrl-C or issue the kill command to interrupt an NFS mount that is hanging indefinitely because a server is down. nointr Specify nointr if users might damage critical data by manually interrupting an NFS request, and you would rather have the system hang while the server is down than risk losing data between the client and the server. Soft Mount Parameters: timeo The timeout, in tenths of a second, for NFS requests. The maximum value for timeo is 30 (3 seconds) and the default value is 7 (0.7 seconds). Try doubling the timeo value if you see several "servers not responding" messages within a few minutes. This can occur because you are mounting directories across a gateway, because your server is slow, or because your network is busy with heavy traffic. retrans The number of times an NFS request is retransmitted after it times out. If the request does not succeed after the specified number of retransmissions, an error is returned. The default value is 4. Increase the retrans value for a directory that is soft-mounted from a server that has frequent, short periods of down time. This gives the server sufficient time to recover so that the soft mount does not return an error. HP Scalable NAS File Serving Software administration guide 193