An: INTERNET--IBMMAIL

Von:     Uwe Haberle    Anschrift: ROTO FRANK AG
Abt.:    TISN                      Stuttgarter Strase 145-147
Telefon: 0711/7598-597 (Fax:447)   70771 Leinfelden-Echterdingen
Betreff:

Rolf Valters ask:

>  1.  Now that it is all installed, I tried backing up the single Server
>     500 (32MB ram - 4GB of files) and got about 27kb per second transfer
>     rate.  At that rate, the 4GB of data would be backed up in about 45
>     hoursU Obviously there is/are tuning parm(s) to change.  I already
>     changed the VTAM entry for MAXDATA from 2048 to 4096 with no
>     difference.  We will not change from SNA to TCP/IP.  Our parent
>     group in St. Paul are getting between 250 and 490 kb/sec, but are
>     running with TCP/IP so can offer no aid.  From what I understand,
>     SNA should be able to see comparable transfer rates.
>     Is anybody else running SNA lu6.2, and where should I look to pump
>     up the throughput?

Take a closer look at the actual RU-Size used in your APPC connection.
Try RU-Sizes of 4096 or higher if your SNA network allows this. In most
cases, the RU-Size has the most significant impact on APPC performance.

We use both LU 6.2 and TCP/IP and LU 6.2 outperforms our TCP/IP connection,
you should gain at least 150-200KB/sec.

Note, that if you use COMPRESSION ON, the actual data transfer shown is
calculated on the size before the files are compressed, and not calculated on
the compressed data transfered over the network. So the rate increases
heavily.

                                   -----
Mit freundlichen Grusen            OV/VM intern:       RFLE(HAEBERLE)
                                        IBM IEA:    IBMMAIL(DEPM99M9)
    Uwe Haberle                        Internet: depm99m9 AT ibmmail DOT com