On Wed, Sep 18, 2013 at 8:51 AM, Roberto Spadim [off-list ref] wrote:

Sorry guys, this time i don't have a full knowledge about the
workload, but from what he told me, he want fast writes with hdd but i
could check if small ssd devices could help
After install linux with raid1 i will install apache mariadb and php
at this machine, in other words it's a database and web server load,
but i don't know what size of app and database will run yet

Btw, ssd with bcache or dm cache could help hdd (this must be
enterprise level) writes, right?
Any idea what the best method to test what kernel drive could give
superior performace? I'm thinking about install the bcache, and after
make a backup and install dm cache and check what's better, any other
idea?

We still need to know what size datasets are going to be used. And
also given it's a webserver, how big of a pipe does he have?

Given a typical webserver in a colo w/ 10Mbps pipe, I think the
suggested config is overkill. For a webserver the 7200 SATA's should
be able to deliver enough data to keep apache happy.

In the database side, depends on how intensive the workload is. I see
a lot of webservers where the 7200's are just fine because the I/O
demands from the database are low. Blog/CMS systems like wordpress
will be harder on the database but again it depends on how heavy the
access is to the server. How many visitors/hour does he expect to
serve?


-- 
Drew