Vince,
We are installing ADSM in many UNIX (Sun Solaris) machines. Our primary
goal is to have at least 15 Sun-Solaris machines in a
"ADSM-compliant"solution. We are about to backup 20 Gb daily. We have a
EXPECTED transfer rate of 10 Gb/hour.
Unfortunately, this requires a SEPARATE backup network in order to
accomplish this rating. We are going to either use FDDI or FastEthernet (it
depends if IBM will be able to deliver the FastEthernet board for AIX).
I suggest you evaluate your "expected transfer rate" first. Of course, you
will need the some information on the backup window and the amount of data.
The second thing to concern is with the ADSM server capacity: Will it be a
separate machine or not? We are going to use a J40 for backup, with 3590
tape drive and 3494 library systems (we are expecting to reach 6Tb).
I think compression (and you may discover very soon) that it will not help
you if you have a short backup window. Compression will help your network,
but will on the other hand sacrifice your machines and thus, increase the
time of backup.The ADS manuals are very clear om this matter: Good machines
can use compression, but if your machines are busy, compression will get
you into trouble. :)
I hope it will help you.
Rgrds,
Armando Lemos
Techical Support - Unibanco
----------
> De: Vincent J. Anderson <T442407 AT RUTADMIN.RUTGERS DOT EDU>
> De: Vincent J. Anderson <T442407 AT RUTADMIN.RUTGERS DOT EDU>
> Para: ADSM-L AT VM.MARIST DOT EDU
> Assunto: ADSM Network Impact
> Data: Sexta-feira, 21 de Fevereiro de 1997 16:15
>
> I currently run a very small (10 clients) ADSM server. We are
considering
> expanding service to several hundred and perhaps eventually several
thousand
> additional clients. However, before we move forward, I've been asked to
> get an answer to the following question:
>
> "What impact will ADSM have on the network?"
>
> Unfortunately, "It depends" isn't going to work for me. :-(
>
> There is concern around here that opening up ADSM to many more clients
> is going to generate a large increase in network traffic that would, in
> turn, have an adverse effect on our network.
>
> Has this issue ever been a concern to your organization?
>
> What impact have you observed on your network? Have you been able to
> measure and quantify this, and if so, how?
>
> Have you ever attempted to predict the impact of additional clients? If
> so, how have you done it? How close to reality have you been able to
> get?
>
> Do you try to control the impact? If so, what do you do? Obviously,
> forcing compression on will reduce the amount of data that goes over
> the network. Is MAXSESSIONS an effective control? Have you tried to
> spread out the initial backups so that you don't have very many of them
> going on at once? What other controls are there?
>
> Have you ever had to make changes to the network due to the effect that
> ADSM traffic had on it? If so, what did you do?
>
> Finally, is there any particular documentation that I could/should look
> at to help me answer this?
>
> Thanks in advance for any help you can give me.
>
> Vince Anderson
> Rutgers University
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