07-24-2013
Class = IN = Internet Protocol
List of DNS record types - Wikipedia, the free encyclopedia
http://tools.ietf.org/html/rfc1035
3.2.4. CLASS values
CLASS fields appear in resource records. The following CLASS mnemonics
and values are defined:
IN 1 the Internet
CS 2 the CSNET class (Obsolete - used only for examples in
some obsolete RFCs)
CH 3 the CHAOS class
HS 4 Hesiod [Dyer 87]
BTW, names ending in '.' are not tried with domain name prefixes. Often, the domain is also a host, like an email or web server. If an email server, it may have a stub web server to redirect everyone to
www.domain.
Last edited by DGPickett; 07-24-2013 at 04:07 PM..
This User Gave Thanks to DGPickett For This Post:
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LEARN ABOUT DEBIAN
gfsched
GFSCHED(1) GFSCHED(1)
NAME
gfsched - schedule and display available file system nodes
SYNOPSIS
gfsched -f gfarm-URL [ -D domain-name ] [ -n number ] [ -LMclw ]
gfsched [ -P gfarm-URL ] [ -D domain-name ] [ -n number ] [ -LMlw ]
DESCRIPTION
The gfsched command with the -f gfarm-URL option displays available file system nodes which have a file replica of the specified gfarm-URL.
When the -f gfarm-URL option is not specified, the gfsched command just displays available file system nodes. In this case, you can spec-
ify a metadata server by the -P gfarm-URL option, if necessary.
OPTIONS
-D domain-name
Limits file system node by specifying a domain name or a hostname.
-c Displays scheduling information for a file creation, if the file specified by -f doesn't exist.
Currently, this option creates the specified file. But please note that this behavior may be changed in future.
-L Suppresses authentication check. Without this option, the scheduler checks whether the user will be successfully authenticated with
the hosts or not. This option omits the check to make scheduling faster, but that creates a risk that hosts which fail authentica-
tion with the user may be scheduled.
-M Suppresses client-side scheduling and only performs metadata-server-side scheduling. This option makes scheduling faster, but also
creates a risk that hosts which is network-unreachable or fails authentication with the user may be scheduled.
-P gfarm-URL
Specifies a gfarm-URL or a pathname to identify a metadata server which is used for the scheduling. This option conflicts with the
-f option.
-f gfarm-URL
The gfsched command schedules file system nodes which have a replica of a file specified by this option. This option conflicts with
the -P option.
-l Long format. This option displays port numbers as well as hostnames. Note that the display format of this option may be changed in
future.
-n number
Displays specified number of file system nodes at most. If this option is not specified, it displays all available nodes.
-w Schedules with write-mode. When this option is specified, file system nodes which don't have enough free space won't be displayed.
When both this option and the -f are specified, and if the file is already opened by an existing process with write-mode, the
gfsched command only displays one file system node which is assigned for writing to the file.
-? Displays a list of command options.
EXAMPLES
The following is an example to inquire file system nodes that the metadata server thinks they are currently working.
$ gfsched -M
Gfarm 28 December 2010 GFSCHED(1)