Checking VXFS QIO usage

This isn't something new however given that i saw this problem at a customer just last week, i would like to point to something you have to keep in mind when using Oracle DB with the Veritas Filesystem.

When you have strange performance problem when using VXFS please ensure that the database isn't sitting around in the POSIX inode r/w-lock with it's database writes. Check if Quick-I/O (solves the issue) or ODM (solves the issue as well) is really activated. QIO is not activated by just using the FILESYSTEMIO_OPTION=setall or by mounting the filesystem with the mount option qio. You have to do more and it looks like this is sometimes forgotten by people setting up or migrating a system.

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