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Usable space for thin pool is less than calculated

Publication Date:  2013-09-05 Views:  476 Downloads:  0
Issue Description
After creating thin pool  the usable space is less than expected  space using calculation for RAID 5 
Alarm Information
Handling Process
If the user wants to make only 1 RAID and use only 1 disk as reduntant 

Number of disks = disk quantity 
Root Cause
There are 2 paramater to be set for creating thin pool 

1- Number of disks
2- Disk Quanitity ( which means number of fisk members per sub RAID group ) 

is the number of disks is 12 and Quantity is 3 , that means 4 sub RAIDs will be created loosing 4 disks for fault tolerance