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    Command:

    fs_getserverprefs

    
    
    
    

    SYNOPSIS

           fs getserverprefs [-file <output to named file>]
               [-numeric] [-vlservers] [-help]
    
           fs gets [-f <output to named file>] [-n] [-v] [-h]
    
           fs gp [-f <output to named file>] [-n] [-v] [-h]
    
    
    

    DESCRIPTION

           The fs getserverprefs command displays preference ranks for file server
           machine interfaces (file server machines run the fs process) or, if the
           -vlserver flag is provided, for Volume Location (VL) Server machines
           (which run the vlserver process). For file server machines, the Cache
           Manager tracks up to 15 interfaces per machine and assigns a separate
           rank to each interface. The ranks indicate the order in which the local
           Cache Manager attempts to contact the interfaces of machines that are
           housing a volume when it needs to fetch data from the volume. For VL
           Server machines, the ranks indicate the order in which the Cache
           Manager attempts to contact a cell's VL Servers when requesting VLDB
           information. For both types of rank, lower integer values are more
           preferred.
    
           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 VL Server ranks range from 10,000 to 10,126. The Cache Manager
           assigns ranks to every machine listed in its copy of the
           /etc/openafs/CellServDB file or found via DNS AFSDB or SRV records for
           the cell when it initializes. When the Cache Manager needs to fetch
           VLDB information from a cell, it compares the ranks for the VL Server
           machines belonging to that cell, and attempts to contact the VL Server
           with the lowest integer rank. If the Cache Manager cannot reach the VL
           Server (because of server process, machine or network outage), it tries
           to contact the VL Server with the next lowest integer rank, and so on.
           If all of a cell's VL Server machines are unavailable, the Cache
           Manager cannot fetch data from the cell.
    
           Default file server ranks range from 5,000 to 40,000, excluding the
           range used for VL Servers (10,000 to 10,126); the maximum possible rank
           is 65,534. When the Cache Manager needs to fetch data from a volume, it
           compares the ranks for the interfaces of machines that house the
           volume, and attempts to contact the interface that has the lowest
           integer rank. If it cannot reach the fileserver process via that
           interface (because of server process, machine or network outage), it
           tries to contact the interface with the next lowest integer rank, and
           so on. If it cannot reach any of the interfaces for machines that house
           the volume, it cannot fetch data from the volume.
    
           -numeric
               Displays the IP addresses of file server machine interfaces or VL
               Server machines, rather than their hostnames. If this argument is
               not provided, the fs command interpreter has the IP addresses
               translated to hostnames such as "fs1.abc.com".
    
           -vlservers
               Displays preference ranks for VL Server machines rather than file
               server machine interfaces.
    
           -help
               Prints the online help for this command. All other valid options
               are ignored.
    
    
    

    OUTPUT

           The output consists of a separate line for each file server machine
           interface or VL Server machine, pairing the machine's hostname or IP
           address with its rank. The Cache Manager stores IP addresses in its
           kernel list of ranks, but the command by default identifies interfaces
           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 -numeric 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.
    
    
    

    EXAMPLES

           The following example displays the local Cache Manager's preference
           ranks for file server machines. The local machine belongs to the AFS
           cell named abc.com, 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, "def.com". It is not possible to
           translate the IP addresses of two machines on the 138.255 network.
    
              % fs getserverprefs
              fs2.abc.com           20007
              fs3.abc.com           30002
              fs1.abc.com           20011
              fs4.abc.com           30010
              server1.def.com       40002
              138.255.33.34         40000
              server6.def.com       40012
              138.255.33.37         40005
    
           The following example shows hows the output displays IP addresses when
           the -numeric flag is included, and illustrates how network proximity
           determines default ranks (as described on the fs setserverprefs
           reference page). The local machine has IP address 192.12.107.210, and
           the two file server machines on its subnetwork have ranks of 20,007 and
    
           The example shows how the -vlservers flag displays preference ranks for
           VL Server machines:
    
              % fs getserverprefs -vlservers
              fs2.abc.com            10052
              fs3.abc.com            10113
              fs1.abc.com            10005
    
    
    

    PRIVILEGE REQUIRED

           None
    
    
    

    SEE ALSO

           fs_setserverprefs(1)
    
    
    

    COPYRIGHT

           IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
    
           This documentation is covered by the IBM Public License Version 1.0.
           It was converted from HTML to POD by software written by Chas Williams
           and Russ Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
    
    
    

    OpenAFS 2012-03-26 FS_GETSERVERPREFS(1)

    
    
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