GFSCHED(1)
NAME
gfsched - schedule and display available file system nodes
SYNOPSIS
gfsched -f gfarm-URL [ -D domain-name ] [ -n number ] [ -LMlw ] 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 specify 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.
- -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 authentication 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 host
- names. 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