สำหรับคำสั่งที่ใช้ทดสอบ
CentOS
hdparm -t /dev/sda
CentOS & FreeBSD
Write Test
dd if=/dev/zero of=/usr/test.bin bs=512 count=4096000
dd if=/dev/zero of=/usr/test2.bin bs=512 count=4096000
Read Test
dd if=/usr/test.bin of=/dev/null

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#rpm –import http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka
#vi /etc/yum.repos.d/utterramblings.repo
insert data
[utterramblings]
name=Jason’s Utter Ramblings Repo
baseurl=http://www.jasonlitka.com/media/EL$releasever/$basearch/
enabled=1
gpgcheck=1
gpgkey=http://www.jasonlitka.com/media/RPM-GPG-KEY-jlitka

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Download and istall:

$ wget http://pecl.php.net/get/APC-3.0.14.tgz
$ tar -xvzf APC-3.0.14.tgz
$ cd APC-3.0.14
$ phpize
$ ./configure –enable-apc
$ make
# make install
 Add the below lines to the php.ini:
extension=/path/to/apc.so
apc.enabled=1
apc.shm_segments=1
apc.optimization=0
apc.shm_size=128
apc.ttl=7200
apc.user_ttl=7200
apc.num_files_hint=1024
apc.mmap_file_mask=/tmp/apc.XXXXXX
apc.enable_cli=1
Restart apache: # service httpd restart

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