If these ping commands fail, check routing settings again. If everything is as it should be, try to ping the SP Switch Router ATM media card or the SP Switch Router Adapter card to which part is failing:
ping 192.168.14.4 (on chosen SP21 processor nodes)
ping 10.1.2.1 (on F50)
If any errors occur, check cabling, the configuration of SP Switch Router media cards (See Section 3.7,
Performance:
To get a rough overview of the data transfer rates that can be achieved in this scenario, the following tests were performed:
1.Again we used tsock to get the performance figures for a mix of packets ranging from 1 byte to 50 kilobytes. This time an average data transfer rate of about 13.5 MB/s was achieved, which corresponds well enough to the theoretical maximum data transfer rate of an ATM connection (17.5 MB/s=155 Mb/s).
2.We used ftp to conduct several file transfers of a 300 MB file from the F50 to the chosen nodes in SP21. We sent this file to /dev/null on the SP21 nodes to eliminate any hard disk influence on the receiver side:
(0)f50:/itso/space 32$ ftp 192.168.14.1 Connected to 192.168.14.1.
220 sp21n01 FTP server (Version 4.1 Tue Mar 17 14:00:13 CST 1998) ready. Name (192.168.14.1:root): root
331 Password required for root. Password:
230 User root logged in. ftp> bin
200 Type set to I.
ftp> put bos.obj.ssp.itso /dev/null 200 PORT command successful.
150 Opening data connection for /dev/null.
226 Transfer complete.
299878400 bytes sent in 31.05 seconds (9431 Kbytes/s) local: bos.obj.ssp.itso remote: /dev/null
ftp> quit
221Goodbye. (0)f50:/itso/space 33$
As you see in the screen shot, although the F50 has very fast disks attached, they still limit the file transfer rate to 9.4 MB/s. So we decided to start two ftp programs on the F50 in parallel. This way we could increase the throughput of the ATM adapter to about 16.5 MB/s, with the F50 being about 50% busy (all data again observed with the freeware tool monitor).
Single RS/6000 SP and Single SP Switch Router 173
