Sizing Tool - Disks

The sizing tool for SCOM 2012 states the following for a 500 Windows Computers and 100 Network Devices scenario:
Role: Operations Database Server, Operations Data Warehouse Server, Web Console Server & SQL Server Reporting Services Server
Hardware:
• 10 disk RAID 10 (Data) (300 GB)
• 2 disk RAID 1 (Log)
• 16 GB RAM
• 4 Cores
Why 10 disks of 300 GB RAID10? This will provide 1500 GB, but there is only about 480 GB needed for the OpsMgr and DW together according to the sizing tool (check below):
DB Size
Number of Days for Data Retention
7
Number of Server Computers
500
Number of Network Devices
100
Number of APM-enabled Computers
0
Total Size (MB)
10671.66
Total Size (GB)
10.42
Total Size (GB) with 50% Buffer
15.63
DW Size
Number of Days for Data Retention
365
Number of Server Computers
500
Number of Network Devices
100
Number of APM-enabled Computers
0
Total Size (MB)
431078.12
Total Size (GB)
420.97
Total Size (GB) with 10% Buffer
463.07
Am I missing something here?
Regards,
Chris

Hi Chris,
The number of disks required is performance related rather than available storage, if there are more spindles then this will allow the striped data to be written quicker (i.e greater IOPS). Obviously the number of IOPS will be dependent upon the storage
you're using and if it's shared, etc.
Hope this helps

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