Hi John, John Drescher wrote: >> I believe the 120MB/s is the raw speed, 240MB/s is the compressed speed. >> > I tried to check on that but I did not find the direct answer. But I > did find an article by IBM that stated that LTO4 did 120MB/s while > LTO3 did 80MB/s. So I went to my tape vendor's web site and it stated > that the 80MB/s for LTO3 was compressed with 40MB/s native so I came > to the conclusion that the 120MB/s number was the compressed number...
Ah, you may well be right, I was in a rush and was using such reliable sources as Wikipedia ;) I'll try and get a more definitive answer. > You are correct. That is why I test with actual data from a raw partition. > > Is this a SCSI tape drive? You might want to check on the speed it is > communicating at (possibly stuck in LVD 80MB/s mode)... It's actually SAS, so I don't believe that can be the problem. Anyway, FWIW, I temporarily hooked the drive (with the same LSI SAS controller) up to a dual 3GHz Core 2 Duo. Got 91MB/s rather than 80MB/s writing zeros to the disk with dd, so the old Opteron does seem to be a tad lethargic. Anyway, I've got multiplexing working, so I'm going to try backing up three clients tomorrow and see what kind of performance I get. I expect it will suck but we'll see :) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
