If these
commands fail, check routing settings again. If everything is
ping
as it should be, try to
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, "Step-by-Step Media Card Configuration"
on page 86 and Section 4.2, "ATM OC-3c Configuration" on page 110) and
network adapters in the F50 and the SP nodes.
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
221 Goodbye.
(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).
the SP Switch Router ATM media card or the SP
ping
Single RS/6000 SP and Single SP Switch Router
173