Deduplication disk sizes

Hello

Well these admin guides are not really clear. My understanding is that you can have up to 64TB on any OS. For 250 or 400TB you need dedicated OS or NBU appliance and Recommended operating systems are:
■ Red Hat Linux 7.5
■ Windows Server 2012 R2 Datacenter

Than you should split this 120TB into some chunks, ie 3x32 + 1x4TB TB take a look How to configure a 250TB Media Server Deduplication Pool (MSDP) on Linux and Windows (veritas.com)

I am not sure why this can't be in only one partition....

Hi StefanosM 

I agree the documentation is not entirely clear. For the OS I would stick to RHEL for preference or Windows (if you must - I would suggest that 2012 R2 is a bad idea as nearing end of life and something current such as 2019 is fine). 

Split the data volumes into equal size LUNs (32 TB is fine, but doesn't need to be that large) and create an additional small LUN (1-2 TB should be fine) for the MSDP catalog. Then follow the instructions as for 250 TB MSDP. 

I understand the multiple partitions is to reduce the total number of files in the one file system to make everything more manageable (but this is my opinion and could be wrong). Don't forget to create the touch file /etc/nbapp-release (or Windows equivalent).

Cheers
David