Red Hat GLOBAL FILE SYSTEM 5.2 Guida di Installazione Scaricare il pdf (Pagina 55)

Variable

Specifies a special reserved name from a list of values (refer to Table 3.5, “CDPN Variable

Values”) to represent one of multiple existing files or directories. This string is not the name

of an actual file or directory itself. (The real files or directories must be created in a separate

step using names that correlate with the type of variable used.)

LinkName

Specifies a name that will be seen and used by applications and will be followed to get to

one of the multiple real files or directories. When LinkName is followed, the destination

depends on the type of variable and the node or user doing the following.

Variable Description

@hostname This variable resolves to a real file or directory named with the

hostname string produced by the output of the following command:

echo `uname -n`

@mach This variable resolves to a real file or directory name with the

machine-type string produced by the output of the following

command: echo `uname -m`

@os This variable resolves to a real file or directory named with the

operating-system name string produced by the output of the

following command: echo `uname -s`

@sys This variable resolves to a real file or directory named with the

combined machine type and OS release strings produced by the

output of the following command: echo `uname -m`_`uname -s`

@uid This variable resolves to a real file or directory named with the

user ID string produced by the output of the following command:

echo `id -u`

@gid This variable resolves to a real file or directory named with the

group ID string produced by the output of the following command:

echo `id -g`

Table 3.5. CDPN Variable Values

Example

In this example, there are three nodes with hostnames n01, n02 and n03. Applications on each

node uses directory /gfs/log/, but the administrator wants these directories to be separate for

each node. To do this, no actual log directory is created; instead, an @hostname CDPN link is

created with the name log. Individual directories /gfs/n01/, /gfs/n02/, and /gfs/n03/ are

created that will be the actual directories used when each node references /gfs/log/.

Example

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Red Hat GLOBAL FILE SYSTEM 5.2 Guida di Installazione Pagina 55