On Mon, 3 Sep 2007, Chris Howells wrote:
> 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 > Bacula now supports multiplexing? ------------------------------------------------------------------------- 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
