Asset ID:	1-72-1019263.1
Update Date:	2011-10-03
Keywords:

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Solution Type  Problem Resolution Sure

Solution  1019263.1 :   VTL - Not all usable space available  


PreviouslyPublishedAs
237924

Applies to:

Sun StorageTek VTL Plus Storage Appliance - Version: 1.0 - Build 1323 to 2.0 - Build 1656 - Release: 1.0 to 2.0
Sun StorageTek VTL Prime System - Version: 1.0 - Build 1813 to 1.1 - Build 2076   [Release: 1.0 to 1.0]
Sun StorageTek VTL Storage Appliance - Version: 4.0 - Build 1221 to 4.0 - Build 1221   [Release: 4.0 to 4.0]
All Platforms
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***Checked for relevance on 28-06-2011*** (dd-mm-yyyy)

Symptoms

VTL is not allowing all available space to be used
Not all usable space available
It is believed that 160TB storage should be available on a VTL with 170TB raw, customer sees ~120TB.

Cause

Actual usable space is approximately 25-30% less than the available raw storage.

Solution

Actual usable space is approximately 25-30% less than the available raw storage

This is expected.  For example, with 170TB raw and 160TB usable disk array storage,  
VTL only shows 120TB.  R5 parity, hot spares, and the fact that disk manufacturers 
round up on disk size to 500GB reduces available storage by 30%.  Engineering provided
the 30% estimate and it is very close to what the customer sees.

Attachments

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