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Optimizing the Solaris Network Cache and Accelerator for the Apache Web Server

I met an old friend whom was complaining that one of his Solaris servers at work which run the Apache web server is very slow. He has added RAM and migrated from RAID-5 to RAID-0 to improve disk I/O but the problem still persists. He asked me if I have any tips to offer as I had some Solaris experience several years ago.

Googling on my personal file-server, I saw a tip I kept since year 2004. Since it could be useful to more people, I decided to share it on my blog.

Note: This tip offers an optimized configuration for dedicated web servers running Apache Web Server on a Solaris Operating System. This document is a brief how-to on configuring and optimizing the Solaris Network Cache and Accelerator (SNCA).

  • Solaris 2.8 OS
  • 256MB RAM
  • Apache Web Server 1.3.x
Necessary Packages for the Solaris OS

32 bits:


64 bits:


1. As a start, edit the file /etc/nca/ncakmod.conf and configure the following parameters:


2. Configure the log file used by SNCA:

Edit the file /etc/nca/ncalogd.conf and configure the following parameters:

status=enabled    // enabled /disabled
logd_path_name="/var/nca/log" // log file
logd_file_size=1000000 // Maximum file size

Create the log file:

$touch /var/nca/ncalogd.conf

3. Configure the network interfaces to work with SNCA:

Edit the file /etc/nca/nca.if:

Add the name of the interfaces, e.g.: hme0 or hme0:1 or * (for all interfaces)

Each interface must have its corresponding file hostname.interface-name inside /etc/ and the corresponding host line in the file /etc/hosts.

4. Verify that the following startup files exist and are enabled:


5. Verify that the line "nca (number)" exists inside the file /etc/name_to_major.

6. Optimizations for maximum performance:

Edit the file /etc/system and add in the end:

* Tuning NCA for 3GB of memory
set sq_max_size=0
set ge:ge_intr_mode=1
set nca:nca_conn_hash_size=82500 // Size of hash table
set nca:nca_conn_req_max_q=100000 // Maximum number of pending connections
set nca:nca_conn_req_max_q0=100000 // Maximum number of pending incomplete connections
set nca:nca_ppmax=290000 // Amount available of memory to use by SNCA (pags)
set nca:nca_vpmax=290000 // Amount available of virtual memory to use by SNCA

7. Restart the system with reconfigure option:

# reboot -- -r

8. Changes in Apache Web Server:

Edit the file /apache/conf/httpd.conf:

KeepAlive Off

Comment the following parameters:


Edit the file /apache/bin/apachectl and include:

# Enable NCA:
if [ -f $NCAKMODCONF ]; then
if [ "x$status" = "xenabled" ]; then
HTTPD="env LD_PRELOAD=/usr/lib/ $HTTPD"

9. Restart Apache Web Server:

/apache/bin/apachectl restart

10. To view the log file:

#ncab2clf -D -i /var/nca/log

That's all :)


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