08-27-2012
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Hi,
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Reply awaited.
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LEARN ABOUT HPUX
nfs4_bsize
nfs4_bsize(5) File Formats Manual nfs4_bsize(5)
NAME
nfs4_bsize - controls the logical block size used by NFS version 4 clients
VALUES
Failsafe
Default
Allowed values
Recommended values
A warning will be issued at runtime if the tunable is set to a value greater than 1048576 bytes since this is beyond the tested limit.
This is not a serious warning but just an information message for the administrator.
DESCRIPTION
controls the logical block size used by NFS version 4 clients. This block size represents the amount of data the client attempts to read
from or write to the server when it needs to do I/O.
Who Is Expected to Change This Tunable?
The distributed file system administrator should examine this value and change it if a larger transfer size is needed.
Restrictions on Changing
The tunable is dynamic; however, the logical block size setting for a file system is set when the file system is mounted. To affect a par-
ticular file system, unmount and mount the file system after changing this parameter.
When Should the Value of This Tunable Be Raised?
Increase this parameter and also the and parameters if larger transfers are desired.
What Are the Side Effects of Raising the Value?
More kernel memory is used to manage the transfer buffer.
When Should the Value of This Tunable Be Lowered?
Lower the value of this tunable if smaller transfer sizes are desired.
What Are the Side Effects of Lowering the Value?
Setting this value to less then 32 KB will increase the number of requests to the NFS Server.
WARNINGS
All HP-UX kernel tunable parameters are release specific. This parameter may be removed or have its meaning changed in future releases of
HP-UX.
Installation of optional kernel software, from HP or other vendors, may cause changes to tunable parameter values. After installation,
some tunable parameters may no longer be at the default or recommended values. For information about the effects of installation on tun-
able values, consult the documentation for the kernel software being installed. For information about optional kernel software that was
factory installed on your system, see at
AUTHOR
was developed by Sun Microsystems, Inc.
SEE ALSO
kctune(1M), sam(1M), gettune(2), settune(2), nfs3_bsize(5), nfs4_max_transfer_size(5), nfs4_max_transfer_size_cots(5), values(5).
Tunable Kernel Parameters nfs4_bsize(5)