I think David meant a performance tool that would help identify the performance problem.
First, the 2nd run went faster due to disk I/O being satisfied by MDC. Your FTP is CPU constrained, so if two sides of the FTP are on the same CPU, then you have half the throughput. Move one of those FTP ends to another server, you have more CPU to focus on the FTP. This is VERY VERY easy to show (i've seen this exact scenario more than once) with proper performance tools. I'd recommend the performance workshop that would help you address the issues before the server people finish giving you black eyes: "http://velocitysoftware.com/workshop.html"; >Date: Tue, 9 May 2006 08:45:49 -0700 >From: Peggy Andrews <[EMAIL PROTECTED]> > >Hi, David. > >We do have a CA monitoring tool. > >Another sysprog that is working this issue had been watching paging >rates and felt we generally have low paging rates, but I will >specifically find out what we are monitoring during the transfer. > >We have 1.6GB defined for the z/VM LPAR. > >The MTU size is the same on both zLinux guests (MTU 1492), >although the x86Linux is defined MTU 1500. > >We are considering shutting down any other unused zLinux guests >on that LPAR (we are in "testing" mode with zLinux) and also, >shutting down unnecessary services and rerunning the transfer. > >We are running z/VM 5.1 RSU level 0402 (and have considered updating >the RSU level). > >This performance is giving us a "black eye" with the distributed >side, so any look-at-this or try-this troubleshooting tips are >of great value to us. > >Thanks! >Peggy > > >Peggy Andrews >Sr. Systems Engineer >Information Technology Department >Technical Support Services Division >City of Sacramento >(916) 808-5438 > > >>>> [EMAIL PROTECTED] 5/9/2006 7:50 AM >>> >Hi: Are you using any performance monitoring tools? Do you have high >paging rates during the linux vm to linux vm transfer? How much real >memory is on the box? Are the MTU sizes the same on both linux machines? >Your variance in times vm-to-vm may point at a resource issue. Also >check that you have all service applied. >What version/release of zvm? >David > > >-----Original Message----- >From: Linux on 390 Port on behalf of Peggy Andrews >Sent: Tue 5/9/2006 10:44 AM >To: [email protected] >Subject: Poor transfer rates between z/VM Linux guests on VSWITCH > >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 "If you can't measure it, I'm Just NOT interested!"(tm) /************************************************************/ Barton Robinson - CBW Internet: [EMAIL PROTECTED] Velocity Software, Inc Mailing Address: 196-D Castro Street P.O. Box 390640 Mountain View, CA 94041 Mountain View, CA 94039-0640 VM Performance Hotline: 650-964-8867 Fax: 650-964-9012 Web Page: WWW.VELOCITY-SOFTWARE.COM /************************************************************/ ---------------------------------------------------------------------- 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
