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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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clinfo(1M)						  System Administration Commands						clinfo(1M)

NAME
clinfo - display cluster information SYNOPSIS
clinfo [-nh] DESCRIPTION
The clinfo command displays cluster configuration information about the node from which the command is executed. Without arguments, clinfo returns an exit status of 0 if the node is configured and booted as part of a cluster. Otherwise, clinfo returns an exit status of 1. OPTIONS
The following options are supported: -h Displays the highest node number allowed to be configured. This is different from the maximum number of nodes supported in a given cluster. The current highest configured node number can change immediately after the command returns since new nodes can be dynami- cally added to a running cluster. For example, clinfo -h might return 64, meaning that the highest number you can use to identify a node is 64. See the Sun Cluster 3.0 System Administration Guide for a description of utilities you can use to determine the number of nodes in a cluster. -n Prints the number of the node from which clinfo is executed. EXIT STATUS
The following exit values are returned: 0 Successful completion. 1 An error occurred. This is usually because the node is not configured or booted as part of a cluster. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) SunOS 5.11 12 Mar 2002 clinfo(1M)
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