(Verified using MySQL 4.1, assumed for other MySQL versions, given that this is a platform architecture issue.) When using the InnoDB storage engine on Solaris 10 for x86_64 architecture (AMD Opteron), it is important to to mount any filesystems used for storing InnoDB-related files using the forcedirectio option. (The default on Solaris 10/x86_64 is not to use this filesystem mounting option.) Failing to use forcedirectio will cause a serious degradation of InnoDB's speed and performance on this platform.
