
4.9 Fundamentals of storage performance 307
Chapter 4
ability and resiliency. While this approach generates a little more
complexity, the return is the benefit for a super-scaling solution that can
deal with the highest workloads, provided you have done a good job at lev-
eling the resource utilization, comprising of the host port interface, cache,
and back-end disk buses and units.
All in all, you should take advantage of RAID and the volume manage-
ment functions offered by PCI-based RAID controllers, as well as the exter-
nal, possibly shared, storage enclosures that will offload the CPU resources
from the parity calculation and disk block management ...