I've read the TID on BM Tuning, and have a question or two. (I'm just


1) The TID says that cache volumes should not be more than 8GB, and if

you have, say, 32GB, you should create several volumes each of less
8GB. What is the reason behind this ? What's the differnce between 4 x

8GB volumes and one 32GB volume ?

2) What does the "cache to deleted file maximum ago ratio" do ?

3) The TID says increase the number of DIRs from the default of 64 to

128, the "Cache hash table size" to 256K & "Maximum number of hot
to 50000. Any guidelines or reasons why these values ?