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UNIX File System Management

115NAS 1000s Administration Guide

NFS Async/Sync Settings

As mentioned in a previous section, there are two versions of NFS: Version 2 and Version 3.

Version 3 supports additional file operations that Version 2 did not have, such as asynchronous

file operations.

To indicate whether to use asynchronous or synchronous write settings:

1. From the WebUI, access the NFS Protocol Properties menu by selecting Shares,

Sharing Protocols. Select NFS Protocol and then click Properties. The NFS Properties

menu is displayed.

2. In the NFS Properties menu, select NFS Async/Sync Settings. The NFS Async/Sync

Settings dialog box is displayed.

3. Select the desired write setting. The default setting is Synchronous writes.

Note: Using synchronous writes allows for greater data integrity. Asynchronous writes will increase

performance but will reduce data integrity as the data is cached before being written to disk.

Figure 63: NFS Async/Sync Settings dialog box

NFS Locks

NFS supports the ability to lock files. File locking helps prevent two or more users from

working with the same files at the same time.

NFS locking depends on the software application components to manage the locks. If an

application does not lock a file or if a second application does not check for locks before

writing to the file, nothing prevents the users from overwriting files.

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HP S1000 Betriebsanweisung Seite 115