fs_getserverprefs - Displays preference ranks for File servers or Location servers


fs getserverprefs [-file <output to named file>] [-noresolve] [-vlservers] [-help]


The fs getserverprefs command (alias fs gp) displays the configured preference ranks for File Server endpoints (running the fileserver process) or, if the -vlserver flag is provided, for Location Server endpoints (which run the vlserver process). The ranks indicate the order in which the Cache Manager attempts to contact the endpoints of servers that are hosting a volume when it needs to fetch data. For Location Servers, the ranks indicate the order in which the Cache Manager attempts to contact a cell's Location Servers. For both types of rank, lower integer values are preferred over higher values.

The Cache Manager stores ranks in kernel memory. Once set, a rank persists until the machine reboots, or until the fs setserverprefs command is used to change it. fs_setserverprefs(1) explains how the Cache Manager sets default ranks, and how to use that command to change the default values.

Default ranks range from 40000 to 40014; the maximum possible rank is 65534. When the Cache Manager needs to perform a network request, it compares the ranks for the network endpoints of servers that can satisfy the request, and attempts to contact the endpoint that has the lowest integer rank. If it cannot reach the selected endpoint it tries to contact the one with the next lowest integer rank, and so on. If it cannot reach any of the endpoints, it cannot perform the request.

The fs getserverprefs command will only return ranks that have been set by the user via the fs setserverprefs command. Default ranks are not shown.


-file <output file>

Specifies the full pathname of a file to which to write the preference ranks. If the specified file already exists, the command overwrites its contents. If the pathname is invalid, the command fails. If this argument is not provided, the preference ranks appear on the standard output stream.


Displays the IP addresses of File Server or Location Server endpoints, rather than their hostnames. If this argument is not provided, the fs command interpreter has the IP addresses translated to hostnames such as


Displays preference ranks for Location Server endpoints rather than File Server endpoints.


Prints the online help for this command. All other valid options are ignored.


The output consists of a separate line for each rank specification. These consist of a server hostname, server IP address, or CIDR range followed by the stored rank. The Cache Manager stores IP addresses in its kernel list of ranks, but the fs command by default identifies endpoints by hostname, by calling a translation routine that refers to either the cell's name service (such as the Domain Name Server) or the local host table. If an IP address appears in the output, it is because the translation attempt failed. To bypass the translation step and display IP addresses rather than hostnames, include the -noresolve flag. This can significantly speed the production of output.

By default, the command writes to the standard output stream. Use the -file argument to write the output to a file instead.


The following example displays the local Cache Manager's preference ranks for file server machines. The local machine belongs to the cell named your-cell-name, and in this example the ranks of file server machines in its local cell are lower than the ranks of file server machines from the foreign cell, It is not possible to translate the IP addresses of two machines on the 138.255 network.

   % fs getserverprefs                    20000          20007          30002          20011          30010   40002                    40000   40012                    40005

The example shows how the -vlservers flag displays preference ranks for Location Server endpoints:

   % fs getserverprefs -vlservers        10052        10113        10005


No special privileges are required for this command.




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