Michael Schuh wrote:
Hello,
yes random IO is more targetted to Databases.
noop, i have the installation always made in the same way, and i have respected
the different diskperformace in different disk-parts.....
this was the reason for
#cd /;
at the beginning of my tests.
In the first test i have me shooting self in my foot and i bites me in
my ass :-)))
I was referring to the partitions and slices on the physical disk - each
operating system is installed in a different one of these, and so is in
a different physical part of the disk - hence you cannot reliably
compare IO rates between them (This very issue has been discussed before
I recall - try a Google search, as it is quite interesting).
my suggestion going more in the direction...first solve all disk(ata) related
performace issues, then test the mysql-performaces issues again to secure
that you are not lying on an mixing of many problems.... :-)
While noone would complain about faster sequential IO, it is almost
certainly not the issue effecting database performance - for instance I
find Postgresql consistently faster on RELENG_5 (5.3 onwards) than on
RELENG_4 (using the pgbench program).
cheers
Mark
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