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Full Discussion: How to troubleshoot a 1000 nodes Apache cluster?
Operating Systems Linux Red Hat How to troubleshoot a 1000 nodes Apache cluster? Post 302750895 by thmnetwork on Wednesday 2nd of January 2013 06:36:54 PM
Old 01-02-2013
The load balancer is going to be a choking point (bandwidth and CPU utilization-wise). If it's bandwidth you may consider increasing the number of links. You can try to increase links through interface bonding. If it's CPU utilization, you might consider multiple load balances (kind of like google.com does) so you can spread load amongst several physical machines. I'd recommend doing that latter anyways, for availability reasons.

Before anyone can give you specific advice though, you need to localize the performance issue. For example, if you run a jMeter test against the serving nodes directly is that faster? If it is, then the load balancer is the choke point. If not then you may check to see if the network links are being saturated with some sort of command-line bandwidth checking tool (I use bwm-ng). If that's not the issue then move onto CPU, memory, etc. Once you've done that you should be in a better position to do something about the performance problems.

It's also possible that it's an application-level latency. For example if a particular website is served by a particular DB cluster and that cluster is going slow it may slow down the end user's experience.
 

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LEARN ABOUT HPUX

nfs2_nra

nfs2_nra(5)							File Formats Manual						       nfs2_nra(5)

NAME

       nfs2_nra - control the number of read-ahead operations queued by the NFS version 2 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 2 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 8192 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, you might want to 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), nfs3_nra(5), nfs4_nra(5), values(5).

							     Tunable Kernel Parameters						       nfs2_nra(5)
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