Am I losing any entropy when using KDFs, such as the ones in NIST Special Publication 800-108?

For example, can I derive 128-bit session keys from a (uniformly random) 128-bit master key?


Question: Performance Counters for SQL Server Related to iSCSI Disk Access
Answer: You need to be looking at seconds per read and seconds per write.  Those numbers will tell you how long the storage is taking to respond.