[Info-vax] Slow FTP transfer Linux -> VMS

[jbriggs444]

On Aug 28, 3:02 am, Robin Schipper <"thespriteman <remove_this> wrote:
> Hi,
>
> when i try to put a big file (lets say 100 Mb) from a Linux system trugh
> FTP on a VMS system, the max speed is 1,5 MB/s
> when i try to put the same file from another VMS system (on the same
> network) to the VMS box the speed is about 10MB/s (it is a 100Mb network)
>
> does anyone know why the linux box doesn't speed up, and how to solve it?

So linux => VMS is slow and VMS => VMS is fast.

If you can rule out network problems, how about the possibility that
the default extend quantity is low and you're getting eaten alive by
small incremental extensions of the VMS output file.

VMS => VMS may be using a "STRU O VMS" transfer mode, complete with
pre-allocation of the output file.  Linux => VMS is almost certainly
using plain vanilla ASCII or BINARY transfer.

Workaround would be to fiddle with the default extend quantity in the
FTP server process or at the volume level.


Of course, as with all network performance problems, one packet
capture is worth 1000 guys sitting in armchairs and guessing.