>I am wondering if there is something in TSM that throttles the tape >performance we should be getting. I can do a dd test from the operating >system to the tape drive and with that receive 2 GB per minute (32 MB/sec) >but when I do a test through TSM, I only get 1 GB per minute. > >My environment is: >TSM 5.7.0 on Solaris 8 >Server: Sunfire 880 >Tape drives are 9840 Fibre attached. > >As a result, we are questioning the value of putting in the more expensive >tape drives when we can't seem to pump the data through as expected. > >Any ideas of what I might look at would be appreciated.
Now, why did you not tell us what the test was? :-) Perspective and context is everything when trying to respond to postings. You very much did the right thing in getting isolated benchmark numbers first. Was the test a single, very large file so as to keep database updating out of the picture, rather than many small files? Was the client co-resident on the server system as to keep network contention out of the picture? All them factors. Richard Sims, BU