NFS file system attributes for z/OS UNIX file systems

For z/OS UNIX files, Table 1 and Table 2 show the file system values that are returned for NFS attributes.

Note: Static UNIX values are for general reference only and may change. Actual values are provided by UNIX System Services or an underlying physical file system such as zFS, TFS, HFS, or NFS client. Refer to these products for current values.

Table 1. File system values to get static file system information
Value	Description	UNIX value
rtmax	Maximum number in bytes for the read request supported by the server	65536 (64KB)
rtpref	Preferred size of the read request	32768 (32KB)
rtmult	Suggested multiple for the size read request	4096
wtmax	Maximum size of a write request supported by the server	65536 (64KB)
wtpref	Preferred size of the write request	32768 (32K)
wtmult	Suggested multiple for the size of a write request	4096
dtpref	Preferred size of the readdir request	8192

Table 2. File system values to retrieve POSIX information
Value	Description	UNIX Value
linkmax	Maximum number of hard links	2 ** 31
name_max	Maximum length of a component file name (file name + attributes)	255
no_trunc	Server will reject any name that is longer than the name_max	True
chown_restricted	Change either the owner or the group associated with the data set	False
case_insensitive	Server does not distinguish the case when interpreting file names	False
case_preserving	If True, the server file system will preserve the case of a name during a create, mkdir, mknod, symlink, rename, or link	True