IBM Mainframe Discussion List <[email protected]> wrote on 02/28/2007 06:23:54 AM:
> Peter Gray wrote: <snip> > > I did some tests with IQD and OSA-Ex2 1000BaseT. The limiting factor > was DASD. Finally I was transitting data from memory to memory and > then achieved greater throughputs. LPAR weight was relatively small, > but when moved it to another LPAR, nothing changed. AFAIK I've got > over 200MB/s. Admittedly a different platform, but I've seen 200MB/sec memory-to-memory FTPs between two zLinux guests running under z/VM on the same single-engine z9 IFL. A couple things that I have noted: 1) FTP GET is substantially faster than FTP PUT (nearly double) 2) MTU size can make a difference (both positive and negative). Gererally, the larger the better (not limitted to Ethernet MTU size of 1500 here), however (on the zLinux side anyway) if you're running with large MTU sizes (say, 32K), you're running in relatively uncharted territory. It might be worthwhile experimenting to find the optimal value. Mark L. Wheeler IT Infrastructure, 3M Center B224-4N-20, St Paul MN 55144 Tel: (651) 733-4355, Fax: (651) 736-7689 mlwheeler at mmm.com “The trouble with the world is that the stupid are cocksure and the intelligent are full of doubt” - Bertrand Russell ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
