IBM AS/400E 32

vThe directory entry is the name of the directory that you want to export. The

pathname you specify will be listed in the DIR parameter on the CHGNFSEXP

command. This entry speciﬁes the path name of the existing directory to be

exported (made available to NFS clients) or unexported (made unavailable to

NFS clients). This directory can not be a sub-directory or a parent of an already

exported directory (unless it is in a different ﬁle system). This parameter is not

allowed when the -A ﬂag is speciﬁed on the OPTIONS parameter.

vThe HOSTOPT parameter has four elements that specify additional information

about the NFS clients that a directory tree is being exported to. If you do not

specify a HOSTOPT parameter for a host name you are exporting the directory

tree to, the defaults for each of the elements of the HOSTOPT parameter are

assumed for that host.

1. The name of the host for which you are specifying additional options. This

host should be speciﬁed above in the OPTIONS -O list as a host that has

access to the exported directory tree. Specify either a single host name that

is an alias for an address of a single host or a netgroup name to be

associated with these options. Youcan assign names to an internet address

with the Work with TCP/IP host table entries option on the Conﬁgure TCP/IP

menu (CFGTCP command). Also, a remote name server can be used to map

remote system names to internet addresses.

2. The network data ﬁle code page is used for data of the ﬁles sent and

received from the speciﬁed HOST NAME (or netgroup name). For any hosts

not speciﬁed on the HOSTOPT parameter,the default network code page

(binary, no conversion) is used.

If the entry being exported resolves to an object within the QSYS.LIB ﬁle

system and the network data ﬁle code page is speciﬁed, then data ﬁles are

opened by OS/400 Network File System Support. NFS will use the open()

API with the O_TEXTDATA and O_CODEPAGE options.

Note: See the

System API Reference,

SC41-4801 book for more details on

the open() API and the O_TEXTDATA and O_CODEPAGE options.

3. The network path name code page is used for the path name components of

the ﬁles sent to and received from the speciﬁed HOST NAME (or netgroup

name). For any hosts not speciﬁed on the HOSTOPT parameter,the default

network path name code page (ASCII) is used.

4. The write mode speciﬁes whether write requests are handled synchronously

or asynchronously for this HOST NAME (or netgroup name). The default

*SYNC value means that data may will be written to disk immediately.The

*ASYNC value does not guarantee that data is written to disk immediately, and

can be used to improve server performance.

Note: The Network File System protocol has traditionally used synchronous

writes. Synchronous writes do not return control of the server to the

client until

after

the data has been written by the server.Asynchronous

writes are not guaranteed to be written.

Examples

Example 1: Exporting all entries from /etc/exports.

CHGNFSEXP OPTIONS('-A')

CHGNFSEXP '-A'

Both of these commands export all entries that exist in the /etc/exports ﬁle.

Example 2: Exporting one directory with options.

32 OS/400 Network File System Support V4R4