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
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.
- -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 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
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