deduplication pool size estimation.
Need an advice for the following.
We have an Netbackup setup with some MSDP pools .
We need to plan our deduplication pool sizes according with our disaster backup/restore scheme we have.
So at buiding a we have the "pud1" server at buildingA ,with client data size (according to the client backup report) at about 7TB.
That building will do a "replicate" - optimized dedup- to the building B at server pud1B.
We have a third building with pud3 with client backups sized at 1.5TB.This one has to replicate to "pud1" at building A
All sizes are taken from full backup sessions.
at "pud1" have some 2Tb of db backups with dedup rate 65%.I undestand that those will need some additional space for one week retention (5 backups)
The main planning is to keep 1 week retension at disk and rehydrate to tape for longer retentions .
The question is what sizes the Disk dedup pools must have?
The Netbackup deduplication calculator gives some 6TB for pud1 and pud1b and some 2ΤΒ Max for pud3.
Is there any safe way to calculate the space?