Hi All,
In last one week, i have posted many questions in this portal. At last i am succeeded to make my 1st unix script.
following are 2 points where my script is taking tooooo long.
1. Print the total number of records excluding header & footer. I have found that awk 'END{print NR -... (2 Replies)
Hi to all,
I'm interested in finding an introduction about Performance Tuning under Unix (or Linux); can somebody please point me in the right direction?
Best regards (1 Reply)
can someone tell me a good site to go to in order to learn this. please do not recommen nay books because i dont have interest in that. if you know of any good sites with good straight forward explanation on how to split loads on machines that has excessive loading, please let me know
Also,... (1 Reply)
nfs4_nra(5) File Formats Manual nfs4_nra(5)NAME
nfs4_nra - control the number of read-ahead operations queued by the NFS version 4 client when sequentially accessing a file
VALUES
Failsafe
Default
Allowed values
Recommended values
A warning will be issued at runtime if the tunable is set to a value greater than 16 since this is beyond the tested limit. This is not a
serious warning but just an information message for the administrator.
DESCRIPTION
controls the number of read-ahead operations that are queued by the NFS version 4 client when sequential access to a file is discovered.
These read-ahead operations increase concurrency and read throughput. Each read-ahead request is generally for 32768 bytes of file data.
Who Is Expected to Change This Tunable?
The distributed file system administrator should examine this value depending on network bandwidth and memory pressure on the client.
Restrictions on Changing
The tunable is dynamic; tuning will take effect immediately on the running system.
When Should the Value of This Tunable Be Raised?
If the network is very high bandwidth and the client and server have sufficient resources, increase this value to more effectively utilize
the available network bandwidth, the client resources, and the server resources.
What Are the Side Effects of Raising the Value?
Tuning incorrectly based on network bandwidth can cause performance problems.
When Should the Value of This Tunable Be Lowered?
In a very low bandwidth network, decrease this value so the NFS client does not overload the network.
What Are the Side Effects of Lowering the Value?
Tuning incorrectly based on network bandwidth can cause performance problems.
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), nfs2_nra(5), nfs3_nra(5), values(5).
Tunable Kernel Parameters nfs4_nra(5)
