Subject: Re: z9 osa speed change 100Mb to 1000Mb
From: Randy Learned (arlearned@gmail.com)
Date: Thu Nov 19 2009 - 13:10:56 EST
Kevin, the upgrade to 1000 went fine. my 30gb fcopy job which had been running 2 hours now took 1.5 hours. so some savings. On Wed, Nov 18, 2009 at 11:02 AM, Kevin Corkery <kcorkery@live.com> wrote: > Randy ... > > We went from a Flex/ES system to the z9. The Flex system was 100Base-T and > the z9 is 1000Base-T. The performance of VTAPE was somewhat better but not > anywhere for what I could use it for time critical applications. I have > been told that VTAPE works much better on Linux than on Windows; this has > something to do with the TCP/IP implementation on Windows. I made the > registry hack for TCPAckFrequency (I think that's it) and it did improve a > little but still not good enough. FTP was considerably faster but still not > anywhere near tenfold. QDIO mode may have made most of the difference, at > least the overhead on the mainframe side was lowered for TCP/IP activity. I > hope that you get better results. Good luck. > > ... Kevin > > -----Original Message----- > From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf Of > Randy Learned > Sent: Wednesday, November 18, 2009 11:50 AM > To: VSE Discussion List > Subject: Re: z9 osa speed change 100Mb to 1000Mb > > Kevin, > > our network team has vlan'd our servers on the gigabit backbone. > our pc's/3270 sessions, however, are mostly 100Mb so terminal access > shouldn't see much change but the server access (ie. ftp) I would expect to > see faster throughput. > we shall see though. > I do have a fcopy job which backs up 30gigs using IBM's vtape server and > that is running around 2 hours to complete. > I will be curious to see if that improves. > > thanks all for your input. > > On Wed, Nov 18, 2009 at 9:48 AM, Kevin Corkery <kcorkery@live.com> wrote: >> Randy ... >> >> As per the speed change. My experience is that, although measurable, >> the speed increase will not be tenfold; actually much less than that >> in practice. Although the card will be connected to your backbone at >> gigabit speed the throughput is more dependent on the overall network >> structure and the destination server's architecture, i.e. Windoze >> versus Unix/Linux. I wish I had more control over these items but >> that's not my responsibility but I'm at the mercy of the LAN > administrators. >> >> Kevin P. Corkery >> Independent Consultant >> Voorhees, NJ 08043 >> >> >> -----Original Message----- >> From: owner-vse-l@Lehigh.EDU [mailto:owner-vse-l@Lehigh.EDU] On Behalf >> Of Randy Learned >> Sent: Wednesday, November 18, 2009 10:02 AM >> To: VSE Discussion List >> Subject: z9 osa speed change 100Mb to 1000Mb >> >> We have upgraded out network to 1000Mb and now are getting ready to >> turn up our z9 osa adapters from 100Mb to 1000Mb. >> We have CSI's tcpip4vse and were just planning on using the stop >> command in each lpar's stack before turning up the respective osa >> settings and then using the start command to resume ip traffic. >> Anybody who's done this know of any issue's I should look out for? >> Also, is there any way I can verify the speed change besides running a >> known ftp job? >> >> Thanks. >> >> -- >> Randy Learned, Mainframe Tech Support >> Nebraska Book Company >> Lincoln, NE >> 402-421-0428 >> arlearned@gmail.com >> >> > > > > -- > Randy Learned, Mainframe Tech Support > Nebraska Book Company > Lincoln, NE > 402-421-0428 > arlearned@gmail.com > > -- Randy Learned, Mainframe Tech Support Nebraska Book Company Lincoln, NE 402-421-0428 arlearned@gmail.com
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