LSI MegaRAID in Linux Ubuntu / Centos Tutorial Setup Guide megacli
Usually when I come across a system like this, Ijust flash the firmware to an IT mode so we get just an AHCI system with JBOD, but sometimes it is not practical for remote systems or if we fear that flashing is too risky if something goes wrong.
In this case, we unfortunately have to use LSI/Broadcom proprietary CLI tools (megacli) to even make the drives visible.
Step 1 - Download MegaCLI
The official broadcom packages lack .deb packages and only have .rpm for........
Apache PHP sending expires header solution cannot use cache with CDN
We've had clients asking why their CDNis not working, it is often a PHPsetting that causes the below header to be sent:
expires: Thu, 19 Nov 1981 08:52:00 GMT
Solution Edit your /etc/php.ini
Set the option below as just being empty. Generally the default is nocache and will result in sending the expires header from 1981.
session.cache_limiter =
Here is what the man says about th........
mysql enable slow query logging/Query Cache Solution - find/track cause of slow mysqld/high IO/CPU usage
If you have a webserver and find you have high IO/lagginess MySQL is one of the first things to check. It turns out MySQL was my problem and it was creating a high load on my server, especially for IO.
How to Enable MySQL Slow Query Logging To Find Slow Performance/Queries
vi /etc/my.cnf
Add this anywhere under [mysqld]
#slow queries
log-slow-queries = /var/log/mysql/mysqlslowqueries.log
long_query_time = 1........