Re: Network data transfer rate

Review the document "New Performance Tuning Guide now available online"
which can be linked to from http://www.storage.ibm.com/software/adsm/
It covers the TCP configuration options and explains other network issues
that affect performance.  I think you'll find it very helpful.

Compare the values below against those defined on the ADSM server and
against the suggested values in the document listed above.

On Tue, 3 Nov 1998, Davis Yee wrote:

> After compare 2 node using "no -a",got following different :-
>
> for slower backup node :-
>  sb_max = 442368
>  tcp_sendspace = 221184
>  tcp_recvspace = 221184
>  udp_sendspace = 59392
>  udp_recvspace = 221184
>
> for faster backup node :-
>  sb_max = 163840
>  tcp_sendspace = 65536
>  tcp_recvspace = 65536
>  udp_sendspace = 32768
>  udp_recvspace = 65536
>
> rfc1323=1 for both node
>
> is that mean something need to change ? or ...
>
> Davis Yee.
>
> >From owner-adsm-l AT vm.marist DOT edu Tue Oct 27 01:40:02 1998
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> >Date:         Tue, 27 Oct 1998 01:38:48 -0800
> >Reply-To:     "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> >Sender:       "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
> >From:         Joel Fuhrman <joelf AT CAC.WASHINGTON DOT EDU>
> >Subject:      Re: Network data transfer rate
> >To:           ADSM-L AT VM.MARIST DOT EDU
> >In-Reply-To:  <19981027085014.310.qmail AT hotmail DOT com>
> >
> >Compare the output from a 'no -a' command on each node. Pay particular
> >attention to tcp_sendspace, tcp_recvspace, rfc1323, and sb_max.  Also,
> the
> >network card in Node_2 may be slower and/or there may be slow router
> thats
> >in its path to the ADSM server the is not in the path for Node_1.
> >
> >On Tue, 27 Oct 1998, Davis Yee wrote:
> >
> >> We have 1 ADSM server and 2 node ( unix box ) backup unix files to
> that
> >> ADSM server. Node_1 is different machine with ADSM server, while
> Node_2
> >> are same as ADSM server. And we found that
> >>
> >> in Node_1 : it take ~20min to backup 3GB data file
> >> in Node_2 : it take ~10hr to backup ~30GB
> >>
> >> It seen totally different of the backup speed with this 2 node
> backup.
> >> we found that the "network data transfer rate" for Node_1 is very
> high
> >> as compared with Node_2.
> >>
> >> As I am not familiar with ADSM, so I would like to know any
> >> configuration or hint can I know what is the big different for that.
> >>
> >> Thanks for any comments.
> >>
> >> Davis Yee.
> >>
> >> ______________________________________________________
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>
>
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