The files
/pnfs/fs/admin/etc/exports/<hostIP>
and
/pnfs/fs/admin/etc/exports/<netMask>..<netPart>
are used to control the host-based access to the pnfs
filesystem via mount points. They have to
contain one line per NFS mount point. The lines are made of the following
four space-separated fields fields:
Mount point for NFS (the part after the colon in e.g.
host:/mountpoint)The virtual PNFS path which is mounted
Permission: 0 means all permissions and 30 means disabled I/O.
Options (should always be nooptions)
In the initial configuration there is one file /pnfs/fs/admin/etc/exports/0.0.0.0..0.0.0.0 containing
/pnfs /0/root/fs/usr/ 30 nooptions
thereby allowing all hosts to mount the part of the pnfs
filesystem containing the user data. There also is a file
/pnfs/fs/admin/etc/exports/127.0.0.1
containing
/fs /0/root/fs 0 nooptions /admin /0/root/fs/admin 0 nooptions
The first line is the mountpoint used by the admin node. If the
pnfs mount is not needed for client operations (e.g. in the
grid context) and if no tertiary
storage system (HSM) is connected, the file
/pnfs/fs/admin/etc/exports/0.0.0.0..0.0.0.0
may be deleted. With an HSM, the pools which write files into
the HSM have to mount the pnfs filesystem and suitable export
files have to be created.
In general, the user ID 0 of the root user on
a client mounting the pnfs filesystem will be mapped to
nobody (not to the user nobody). For the
hosts whose IP addresses are the file names in the directory
/pnfs/fs/admin/etc/exports/trusted/
this is not the case. The files have to contain only the number
15.