Emerson ATCA-S201 Manuel D’Utilisation
RTM-ATCA-SXXX Overview
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ATCA‐S201 Installation and Use Guide
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/export/nfs/Fileshare nfs_share1(rw,sync,no_wdelay,root_squash)
Export option syntax:
<export><host1>(<options>) <hostN>(<options>)
Note: Refer to the exports man page for details on other lesser-used options.
Table 36 Common nfs export option definitions
host1-hostN
Host specifies the directory on the storage blade that is the target of the export.
Option <wdelay|no_wdelay>
no_wdelay- (default) option turns off the delayed writes feature; no_wdelay must be accompanied with the
sync option.
wdelay- option causes the NFS server to delay writing to the disk if it suspects another write request is imminent.
This can improve performance by reducing the number of times the disk must be accessed by separate write
commands, reducing write overhead.
Option <root_squash>
This default setting prevents root users connected remotely from having root privileges and assigns them the
user ID for the user nfsnobody. This effectively "squashes" the power of the remote root user to the lowest local
user, preventing unauthorized alteration of files on the ATCA storage blade.
Option <ro|rw>
ro - Mounts of the exported file system are read-only. Remote hosts are not able to make changes to the data
shared on the file system.
rw- (default) Mounts of the exported file system are read/write. Remote hosts are able to make changes to data
shared on the file system
Option <sync>
The sync setting (default) instructs the Linux kernel to minimize the amount of write data kept in volatile system
memory. Though it is sometimes slower to complete all writes to disk, doing so can prevent data loss in the
event of a power failure.
Host specifies the directory on the storage blade that is the target of the export.
Option <wdelay|no_wdelay>
no_wdelay- (default) option turns off the delayed writes feature; no_wdelay must be accompanied with the
sync option.
wdelay- option causes the NFS server to delay writing to the disk if it suspects another write request is imminent.
This can improve performance by reducing the number of times the disk must be accessed by separate write
commands, reducing write overhead.
Option <root_squash>
This default setting prevents root users connected remotely from having root privileges and assigns them the
user ID for the user nfsnobody. This effectively "squashes" the power of the remote root user to the lowest local
user, preventing unauthorized alteration of files on the ATCA storage blade.
Option <ro|rw>
ro - Mounts of the exported file system are read-only. Remote hosts are not able to make changes to the data
shared on the file system.
rw- (default) Mounts of the exported file system are read/write. Remote hosts are able to make changes to data
shared on the file system
Option <sync>
The sync setting (default) instructs the Linux kernel to minimize the amount of write data kept in volatile system
memory. Though it is sometimes slower to complete all writes to disk, doing so can prevent data loss in the
event of a power failure.