OFA: Why?

Hi!

In the Oracle documentation, it's often suggested to use OFA to design where files are located. This suggests to create filesystems /u00, /u01,
/u02 ...

What I don't get - suppose that my server supports RAID 5. Why would it be "better" to have 3 fs (one for each harddisk) instead of having one
/data filesystem which consists of those 3 harddisks?

I could, of course, also use logical volume manager to create one volume group and then create /u00, /u01 and /u02 as lv's in this vg. But why? If those filesystems would be used to store "ordinary" files, I could see a use (eg. backup purposes), but not so in Oracle.

My question: Why use OFA? Where are the advantages compared to having one fs which hosts all the datafiles for Oracle?

Alexander Skwar

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