How fast does the MVS Download xfer data to an ESCON
ITEM: RTA000098440
Q:
ABSTRACT: How fast does the MVS Download xfer data to an ESCON
attached AIX system? Is this the fastest method avail?
SEARCH ARG: psf/mvs download escon
TOPIC THREAD: PRINT
PSF/AIX
I have a customer who is looking at OnDemand for AIX. His concern is
that he must move 5GB/day to the AIX machine from his MVS system. I
believe the most efficient method would be through MVS Download to an
ESCON attached AIX system. How fast would the xfer be? I believe the
ESCON can run at 17MB/sec max. How efficiently does TCP/IP utilize this
bandwidth (i.e. effective data rate)?
Q:
It's early in the morning and after some thought I should ask a more
basic question. Can MVS Download utilize an ESCON channel? TCP/IP
implies communication not channel but I know an AIX machine can be
ESCON attached so...
I found a ASKQ item that states 350KBytes might be a reasonable max
for TCP/IP xfer. If that is the case we can run Multiple FSAs under
an FSS to get multiple parallel performance... true. Is there a max
xfer rate between MVS and AIX with MVS Download that this would yield?
I need this number to practically plan for the 5GB xfer/day.
Q:
After further searches on ASKQ I have found that ESCON does support
TCP/IP. Version 3.1 yields 2.1MB/sec for an FTP binary xfer. Knowing
that MVS Download was designed to increase performance over FTP what
is the expected data rate of this transfer. My data is bank statements
and G4 compressed check images to the RS/6000.
Q:
I found the ASKQ item that stated a 2.1MB xfer rate...RTA000080769.
It's a long item so go to the bottom and go back 2-3 pages.
A:
I'm sorry, but the plain truth is that we have no quantifiable
performance data on MVS Download. Nor can the developers or performance
analysts provide any informed speculation as to whether or not MVS
Download would be the fastest way of transferring the data, though it
does provide functions (such as checkpointing and accounting) that
plain FTP does not.
The 350KB/sec number from ASKQ item RTA000098090 was from an informal
observation of an MVS Download of an uncompressed RAST50 job from a
9221-270 to an RS/6000 Model 370. I need to get more details on the
physical connection however. TCP/IP for MVS V3.1 was used since that
is the prerequisite level for MVS Download.
Assuming that you can get 350KB/sec with MVS Download based on the
other ASKQ item (which I'm told was using token-ring connections),
you should be able to transfer your 5GB of data within a single shift.
I also asked about the possibility of running multiple FSAs in parallel,
but again, the response was that unfortunately he had no empirical
information to be able to comment in that area.
I'm sorry; I don't know what else to tell you. You may wish to
escalate the need for additional performance data in this area through
the business line manager for PSF/MVS or through the performance group.
Thanks for using WWQA.
S e a r c h - k e y w o r d s:
CROSS MVS AIX PSF DOWNLOAD PERFORMANCE ESCON ONDEMAND TCP/IP
psf/6000 psf/aix infoprint rate speed os/390 transfer
WWQA: ITEM: RTA000098440 ITEM: RTA000098440
Dated: 11/1999 Category: XPSF6000
This HTML file was generated 2000/11/30~13:34:06
Comments or suggestions?
Contact us