Guru's,

I need to estimate our ADSM growth over the next 2-3 years.

Currently we backup 30+ AIX servers, with the vast bulk of data (300+ Gb per
day) being large files from Oracle and SAP. We are just starting to add NT
LAN servers and will soon also need to add LAN servers from another business
we recently purchased.

I've collected data on the existing LAN server's total capacity, daily
incremental backup size, total number of files, LAN/WAN speed, etc.

Total volume of LAN data is about 200 Mb, with about 5% of that in each
daily incremental. About 80,000 files are included in each incremental LAN
backup.

I assume our ADSM database is going to grow rapidly when we add the LAN
servers. If each file requires 5-700 bytes in the ADSM database then this
adds up to about 48 Mb per day added to the database! Does that sound
realistic?

How will HSM on the LAN servers effect data size? I assume it will free disk
space, which the users will rapidly refill. :)

I also need to estimate 3590 tape and drive requirements to suit. We
currently have 6 3590 drives in a 3494 tape library. I understand IBM will
soon offer upgrades to give the 3590's a 20 Gb native capacity, and double
length tapes will also be available in the future.

Does anyone here have any tips on what else to consider? Have you gone
through this exercise before?

Steven P.