Coyote Point Systems Equalizer, Installation And Administration Manual

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Appendix D:Equalizer Configuration File
112 Equalizer Installation and Administration Guide
strikeout_threshold
This is the number of times a server will be observed as being failing prior to it being
marked down.
Minimum: 2, Maximum: 6, Default: 2.
send_socket_buffer
This is the amount of space, specified in KBytes, reserved in each socket buffer for each
socket representing a request being received.
For L7, the entire request must be received into the socket buffer prior to the load
balancing decision being made. This potentially ties up kernel (non-swappable) memory
while the request is being received. “Reserving” the space doesn't pre allocate it--- it
permits the networking subsystem to allocate up to that amount of memory to the socket
to contain the request. This must typically be a fudge factor of a few KB larger than the
maximal request possible for the particular L7 protocol.
Setting the buffer size too high can open the potential for incorrect client behavior to cause
memory to be wasted on an invalid request. Setting the buffer size too low can result in
clients hanging and not being able to send the entire valid request.
log_hours
The number of hours that the system saves performance history information. For example,
if log_hours is set to 72, the system will be able to plot three days of performance statistics.
The maximum value for log_hours is 168 (7 days).
plot_clip
The plot_clip parameter enables you to specify a clipping value for the performance
history data that’s logged. For instance if you have log spikes every couple of hours in the
10,000 range, but most of your data is in the hundreds, you could set the plot_clip to 1000
to prevent the spikes from overwhelming your graphs. (This parameter rarely needs to be
set.)
sticky_netmask
The sticky_netmask parameter is used when sticky network aggregation is enabled. It
indicates which portion of the address Equalizer should use to identify particular
networks. The mask corresponds to the number of bits in the network portion of the
address:
■
8 bits corresponds to a class “A” network
■
16 bits corresponds to a class “B” network
■
24 bits corresponds to a class “C” networks
Note – For HTTP/HTTPS, this doesn't include any POST data or additional data entities in
addition to a valid HTTP request. Just the request headers. For HTTPS, it is not necessary to
add any overhead for the SSL/TLS protocol.