[Users] the procedure of storage-related

[bigclouds]

hi,all
1.i am now not very familar with the right procedure of storage,
    please give me a simply introduction of their concept and relation. help me out
 
StoragePool,StorageDomain
image,volume
 
 
2.please help me confirm.
i find only one place call mount command, which is poolConnectStorageServer.
if poolConnectStorageServer is before create and active StoragePool,StorageDomain?
 
3.if attach is just modify metadata, not anything else?
 
4.sp.py, deactivateSD
  if i deactivate ISO storage,it finally umount masterDir, why  ?
  if masterDir is not  mastersd?
thanks
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