Hi, In our TSM environment we use two locations that are about 30 km away from each other. On both sides we use TSM servers and 3592 tapedrives. We use SAN and DWDM between the two locations. Writing data from a TSM server to a tapelibrary that are on the same location have the speed according the technical specifications. A TSM server writing to the other location has not half of the speed.
For example: On one side we have 3592 E06 tapedrives, that can write with a speed of 160MB/sec, when the TSM server is on the same location. There is 1 SAN switch between the server and tapelibrary. A TSM server on the other location, that is also connected with that library, get a speed of 60MB/sec. There is a SAN switch and a DWDM switch on one location and also a DWDM switch and a SAN switch on the other location between the server and tapelibrary. The speed of the HBA's in the TSM servers is 2Gb/sec, the speed of the ports on the SAN switches are 2 Gb/sec and 4 Gb/sec and the speed of the DWDM swiches is 2,5 Gb/sec. 2Gb/sec is about 320MB/sec. So the bottleneck is should be 320MB/sec. When there is no other traffic on this network, the speed should be more than 60MB/sec. The speed is of the tests is determined of data of the summary table of the TSM datebase. Can some explain why the speed is very slow? (only 60MB/sec instead of 160MB/sec). Does anyone know how one can determine the speed of DWDM switches? Thanks, Ruud Meuleman ********************************************************************** This transmission is confidential and must not be used or disclosed by anyone other than the intended recipient. Neither Tata Steel Europe Limited nor any of its subsidiaries can accept any responsibility for any use or misuse of the transmission by anyone. For address and company registration details of certain entities within the Corus group of companies, please visit http://www.corusgroup.com/entities **********************************************************************
