Technical data

NFS Server
20.12 Modifying NFS Server Attributes
Table 20–3 (Cont.) Modifying NFS Server Attributes
Attribute Description
vnode_age Specifies the number of seconds in the time interval since the
last file access request.
The server keeps an activity timestamp for each opened file
to help manage the open file cache. You can also modify
this value with the /INACTIVITY qualifier to the SET NFS_
SERVER command.
The default setting for this variable is 120, or 2 minutes. Be
careful not to set this value to a small interval; this might
reduce performance.
20.13 Modifying File System Characteristics
The file SYS$STARTUP:TCPIP$NFS_SERVER_STARTUP.COM also defines a set
of logical names that set the file system parameters. Table 20–4 describes these
logical names.
Table 20–4 File System Logical Names
Logical Name Description
TCPIP$CFS_CACHE_LOW_LIMIT Defines the minimum size of the free buffer list. When the list
is smaller than the value of this logical name, the file system
starts to reclaim used buffers.
The default is 4 buffers.
The free buffer list needs at least 4 free buffers (not taken
by cache). If the actual number of free buffers is less than
TCPIP$CFS_CACHE_LOW_LIMIT, the used buffers are
returned to the free list until the size of the free list reaches
the value of TCPIP$CFS_CACHE_HIGH_LIMIT.
TCPIP$CFS_CACHE_HIGH_LIMIT Defines the number of buffers the file system tries to keep in
the free buffer list.
The default is 8 buffers. See TCPIP$CFS_CACHE_LOW_
LIMIT.
In a busy server environment, setting this parameter higher is
likely to improve performance.
TCPIP$CFS_CACHE_SIZE Defines the maximum number of cache buffers to be allocated.
TCPIP$CFS_TRANSFERSIZE Defines the optimum size (in bytes) of the data transferred
between server and client on READ and WRITE operations.
The default is 8K bytes (8192 bytes). This value is used in most
NFS server implementations.
TCPIP$CFS_SHOW_VERSION Sets the SHOW_VERSION logical name ON or OFF. If ON,
the NFS server returns to the client file names with version
numbers, even if there is only one version of the file.
The default is OFF.
TCPIP$CFS_MODUS_OPERANDI Defines various operating modes. Use only under the advice of
your Compaq support representative.
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20–18 NFS Server