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zhaos2
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EMC Virtual Provisioning 'Thin device preallocation' for Oracle thin pool planning

When we plan EMC Symmetrix Virtual Provisioning for Oracle database thin pool, we can use:

1. Oversubscription

2. Undersubscription

3. Thin device preallocation

Can anyone explain how 'Thin device preallocation' work with 'Oversubscription' and 'Undersubscription'?

Thanks!

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2 Replies
MacBookPro_9_2
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Re: EMC Virtual Provisioning 'Thin device preallocation' for Oracle thin pool planning

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zhaos2
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Re: EMC Virtual Provisioning 'Thin device preallocation' for Oracle thin pool planning

Yes, Saty, I did read this white paper, but only some simple words like 'thin device preallocation can work with oversubscriptiona and undersubscription to reserve space for database......'. 

For Oversubscription, since Oracle DB files initialize their space as soon as they are created even though they are still empty, that means the DB files initialization will preallocate space for the files created?  So how 'Thin device preallocation' work with 'DB file initialization preallocation'?

For undersubscription, as thin devicies capacity is smaller than physical storage pool, what is the significance for 'thin device preallocation?

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