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3PAR RAID 5 (3+1) calculation
https://3parug.com/viewtopic.php?f=18&t=164		 Page 1 of 1
Author:  zuwairi14 [ Wed Jun 20, 2012 10:42 pm ]
Post subject:  3PAR RAID 5 (3+1) calculation
Hi Gurus,

Need to ask on how 3PAR calculate the raw, useable capacity, spare using RAID 5 (3+1).

System F400

4 Cages
each cages has 12 disk
disk type FC
capacity for each disk is 600GB

I need to know how to calculate the useable capacity and spare require.

As in system i can see this

cli% showspace -t r5
---Estimated(MB)---
RawFree UsableFree
25907200 19430400

cli% showsys -space
---------System Capacity (MB)----------
Total Capacity : 27451392
Allocated : 1540096
Volumes : 93184
Base Volumes : 0
User : 0
Copy : 0
Admin : 0
CPGs (TPVVs & CPVVs) : 93184
Copy : 44032
Used : 28672
Unused : 15360
Admin : 49152
Used : 16128
Unused : 33024
Unmapped : 0
System : 1446912
Internal : 303104
Spare : 1143808
Used : 0
Unused : 1143808
Free : 25911296
Initialized : 25911296
Uninitialized : 0
Unavailable : 0
Failed : 0

Help me to understand this...really appreciated.
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