Hi Ian,

Great information...

I had no idea Windows 2003 could get read speeds of 400MB/s.

My proposed VTL does not do de-dupe in line, it is a post process so I am not 
concerned with VTL performance.

I need to backup about 10 TB's from the array. This is a mix of file system, 
email and database...  I will be using BCV's and mounting those volumes on Win 
2003 hosts.

I am not sure how much impact TSM has on moving data? I have a choice. I can 
use VTL or add more physical LTO-3 drives... I understand the benefits of a VTL 
in a TSM environment, but more specifically...

LTO-3 can do 80MB/sec. If I have 4 drives allocated to Windows host, I don't 
think I can keep them streaming? Will I be better off with 8 virtual drives? 
Will more streams give me more performance with TSM?

I am new to TSM, I know it does not do multiplexing but not sure about 
multistreaming?

Am I better off creating multiple BCV's and mounting different file systems in 
order to have more streams or should I keep it simple and have larger luns with 
only a single stream?

Thanks again for the help.

Pat

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