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Storage Pools and Volumes Oh My

Question asked by mandoskippy on Nov 25, 2012
Latest reply on Nov 25, 2012 by Ted Dunning
Is there any good documentation on storage pools and how they interact with drives and with volumes?  The reason I ask is I have 8 spinny drives in my small cluster. When I do a DD read from the drives, the all around around 125 - 130 MB/sec (one the Western Digital Red runs up to 160 MB/sec) However two of the drives run at only 80 MB/sec.   Are those two drives, because of inclusion in a storage pool now severely hampering my performance? How do determine which drives are in which pools, and which volumes are on which pools or am I completely misunderstanding this?  There isn't much documentation about this in general.