Some additional networking tests that might be revealing:
FTP from zLINUX2 to zLINUX1 FTP from x86Linux to zLINUX1 and FTP from x86Linux to zLINUX2. These tests might reveal if there is something different between the two Linux guests and help to focus on which might be having the problem. The tests presented in your email make the implicit assumption that the two Linux guests are operating the same and this may not be the case. If the slowest transfer rates are always between the two Linux guests, resource contention might be a good path of research. If one performs better than the other, look for why they are different. Also, do a traceroute from zLINUX1 to zLINUX2 and from zLINUX2 to zLINUX1. The traceroute will ensure that there are no unexpected network paths coming into play for packets flowing in either direction. There should be no hops between the two zVM Linux guests. The traceroute tests verify that VSWITCH is operating as you think it is. Some simple tests can be performed using ping options (set various payload sizes and do-not-fragment IP options) to verify MTU. These should likewise be performed from and to each Linux guest. MTU's must be the same for both Linux guests' VSWITCH interfaces to avoid fragmentation and reassembly. Assume nothing and verify everything. Harold Grovesteen Peggy Andrews wrote:
We are running Linux guests on an IFL running z/VM I have two Linux (both SuSE 9) guests defined to the VSWITCH I have a 684MB file I use FTP to transfer the file from zLINUX1 to zLINUX2 Results: 1st ftp - 684MB in 2:47 (3.8MB/s) 2nd ftp - 684MB in 1:34 (6.88MB/s) First question, why is the transfer better on the 2nd ftp of the file? Then, I attempt the same file transfer from on of my zLinux guests to an Intel platform Linux server (also SuSE9) on the network (outside of the IFL). I use the same 684MB file and use FTP to transfer the file from zLINUX1 to x86Linux Results: 1st ftp - 684MB in 1:11 (9.17MB/s) 2nd ftp - 684MB in 1:05 (9.96MB/s) Biggest question, why is the transfer better going out the OSA adapter on the network? I certainly thought the transfer between two guests on the VSWITCH would have at least been equal if not better?? Any suggestions regarding configuration corrections or troubleshooting are greatly appreciated. Peggy Peggy Andrews Sr. Systems Engineer Information Technology Department Technical Support Services Division City of Sacramento (916) 808-5438 ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
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