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177 lines
6.9 KiB
Plaintext
177 lines
6.9 KiB
Plaintext
=head1 NAME
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fs_getserverprefs - Displays preference ranks for file servers or VL servers
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=head1 SYNOPSIS
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=for html
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<div class="synopsis">
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B<fs getserverprefs> S<<< [B<-file> <I<output to named file>>] >>>
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[B<-numeric>] [B<-vlservers>] [B<-help>]
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B<fs gets> S<<< [B<-f> <I<output to named file>>] >>> [B<-n>] [B<-v>] [B<-h>]
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B<fs gp> S<<< [B<-f> <I<output to named file>>] >>> [B<-n>] [B<-v>] [B<-h>]
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=for html
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</div>
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=head1 DESCRIPTION
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The B<fs getserverprefs> command displays preference ranks for file server
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machine interfaces (file server machines run the B<fs> process) or, if the
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B<-vlserver> flag is provided, for Volume Location (VL) Server machines
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(which run the B<vlserver> process). For file server machines, the Cache
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Manager tracks up to 15 interfaces per machine and assigns a separate rank
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to each interface. The ranks indicate the order in which the local Cache
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Manager attempts to contact the interfaces of machines that are housing a
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volume when it needs to fetch data from the volume. For VL Server
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machines, the ranks indicate the order in which the Cache Manager attempts
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to contact a cell's VL Servers when requesting VLDB information. For both
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types of rank, lower integer values are more preferred.
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The Cache Manager stores ranks in kernel memory. Once set, a rank persists
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until the machine reboots, or until the B<fs setserverprefs> command is
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used to change it. The reference page for the B<fs setserverprefs> command
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explains how the Cache Manager sets default ranks, and how to use that
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command to change the default values.
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Default VL Server ranks range from 10,000 to 10,126, and the Cache Manager
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assigns them to every machine listed in its copy of the
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F</usr/vice/etc/CellServDB> file. When the Cache Manager needs to fetch
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VLDB information from a cell, it compares the ranks for the VL Server
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machines belonging to that cell, and attempts to contact the VL Server
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with the lowest integer rank. If the Cache Manager cannot reach the VL
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Server (because of server process, machine or network outage), it tries to
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contact the VL Server with the next lowest integer rank, and so on. If all
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of a cell's VL Server machines are unavailable, the Cache Manager cannot
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fetch data from the cell.
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Default file server ranks range from 5,000 to 40,000, excluding the range
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used for VL Servers (10,000 to 10,126); the maximum possible rank is
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65,534. When the Cache Manager needs to fetch data from a volume, it
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compares the ranks for the interfaces of machines that house the volume,
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and attempts to contact the interface that has the lowest integer rank. If
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it cannot reach the B<fileserver> process via that interface (because of
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server process, machine or network outage), it tries to contact the
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interface with the next lowest integer rank, and so on. If it cannot reach
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any of the interfaces for machines that house the volume, it cannot fetch
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data from the volume.
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For both file server machines and VL Server machines, it is possible for a
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machine or interface in a foreign cell to have the same rank as a machine
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or interface in the local cell. This does not present a problem, because
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the Cache Manager only ever compares ranks for machines belonging to one
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cell at a time.
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=head1 OPTIONS
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=over 4
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=item B<-file> <I<output file>>
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Specifies the full pathname of a file to which to write the preference
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ranks. If the specified file already exists, the command overwrites its
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contents. If the pathname is invalid, the command fails. If this argument
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is not provided, the preference ranks appear on the standard output
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stream.
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=item B<-numeric>
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Displays the IP addresses of file server machine interfaces or VL Server
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machines, rather than their hostnames. If this argument is not provided,
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the B<fs> command interpreter has the IP addresses translated to hostnames
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such as C<fs1.abc.com>.
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=item B<-vlservers>
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Displays preference ranks for VL Server machines rather than file server
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machine interfaces.
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=item B<-help>
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Prints the online help for this command. All other valid options are
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ignored.
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=back
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=head1 OUTPUT
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The output consists of a separate line for each file server machine
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interface or VL Server machine, pairing the machine's hostname or IP
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address with its rank. The Cache Manager stores IP addresses in its kernel
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list of ranks, but the command by default identifies interfaces by
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hostname, by calling a translation routine that refers to either the
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cell's name service (such as the Domain Name Server) or the local host
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table. If an IP address appears in the output, it is because the
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translation attempt failed. To bypass the translation step and display IP
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addresses rather than hostnames, include the B<-numeric> flag. This can
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significantly speed the production of output.
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By default, the command writes to the standard output stream. Use the
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B<-file> argument to write the output to a file instead.
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=head1 EXAMPLES
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The following example displays the local Cache Manager's preference ranks
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for file server machines. The local machine belongs to the AFS cell named
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B<abc.com>, and in this example the ranks of file server machines in its
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local cell are lower than the ranks of file server machines from the
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foreign cell, C<def.com>. It is not possible to translate the IP addresses
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of two machines on the 138.255 network.
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% fs getserverprefs
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fs2.abc.com 20007
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fs3.abc.com 30002
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fs1.abc.com 20011
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fs4.abc.com 30010
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server1.def.com 40002
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138.255.33.34 40000
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server6.def.com 40012
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138.255.33.37 40005
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The following example shows hows the output displays IP addresses when the
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B<-numeric> flag is included, and illustrates how network proximity
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determines default ranks (as described on the B<fs setserverprefs>
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reference page). The local machine has IP address 192.12.107.210, and the
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two file server machines on its subnetwork have ranks of 20,007 and
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20,011. The two file server machines on a different subnetwork of the
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local machine's network have higher ranks, 30,002 and 30,010, whereas the
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ranks of the remaining machines range from 40,000 to 40,012 because they
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are in a completely different network.
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% fs getserverprefs -numeric
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192.12.107.214 20007
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192.12.105.99 30002
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192.12.107.212 20011
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192.12.105.100 30010
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138.255.33.41 40002
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138.255.33.34 40000
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138.255.33.36 40012
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138.255.33.37 40005
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The example shows how the B<-vlservers> flag displays preference ranks for
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VL Server machines:
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% fs getserverprefs -vlservers
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fs2.abc.com 10052
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fs3.abc.com 10113
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fs1.abc.com 10005
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=head1 PRIVILEGE REQUIRED
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None
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=head1 SEE ALSO
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L<fs_setserverprefs(1)>
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=head1 COPYRIGHT
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IBM Corporation 2000. <http://www.ibm.com/> All Rights Reserved.
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This documentation is covered by the IBM Public License Version 1.0. It was
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converted from HTML to POD by software written by Chas Williams and Russ
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Allbery, based on work by Alf Wachsmann and Elizabeth Cassell.
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