Hi Mike,
The way we do it is installing each mysql instance from a
precompiled binary.
So if you had an 8 core box, and you wanted to use each of the 8
cores, you could install a mysql binary installation and then make 7
copies of it. We use an internal naming convention like the following:
/data01/multi_mysql/mysql_A
/data01/multi_mysql/mysql_B
/data01/multi_mysql/mysql_C
/data01/multi_mysql/mysql_D
Create a my.cnf under each of these mysql instance directories.
Then all you have to do is create a mysql start up script for each
of the instances in /etc/init.d.
The startup script needs to the following three variables set.
basedir=/data01/multi_mysql/mysql_A
datadir=/data01/multi_mysql/mysql_A/data/
export MYSQL_HOME=/data01/multi_mysql/mysql_A/
The datadir variable is contained under the rest of the mysql
installation. I usually put the logs under
/data01/logs/mysql_A
/data01/logs/mysql_B
This approach is very simple, and works quite well. We use it
instead of the multi_mysql startup/my.cnf approach.
The approach works particularly well when you have lots of IO, as
you said you did. We use this on large raid array DAS, and it works
great.
If there is anything unclear about my explanation. Please do let me
know if you have any questions. I am happy to help.
-Tom
On Jun 10, 2009, at 2:19 PM, Mike Spreitzer wrote:
If I have a computer with many cores and multiple disks, disjoint
filesystems on those disks, and enough I/O bandwidth in the machine to
keep the disks busy, can MySQL keep those disks busy if I have it
working
on different databases at the same time? If so, can one MySQL server
process do that, or do I need multiple server processes? If one
process
is enough, presumably I have to say something clever in my.cnf to
make it
happen; what would that be? If it can be done with multiple server
processes, can I get that from one MySQL installation (and if so,
how) or
do I need to somehow fool my package management system (RPM on RHEL)
into
doing multiple installations?
Thanks,
Mike Spreitzer
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