I think you can only use shared memory if the ADSM server and the ADSM client
are on the same physical machine.
Is this your setup?  If so, then shared memory is recommended.  The performance
tuning guide says set:
  commmethod shrmem
 shmport 1510
and then "the shared memory protocol uses system resources more efficiently".



ADSM-L AT VM.MARIST DOT EDU on 04/30/98 08:14:10 AM
Please respond to ADSM-L AT VM.MARIST DOT EDU
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject: Re: SHMEM or TCP/IP?


Ask your IBM rep for the document "ADSTAR Distributed Storage Manager
for AIX V3 R 1 Performance Evaluation Report". It does not have a
document number, but it is dated 10/31/97 and the authors are Holley,
Knapp and Paranjape.  The report documents performance of RS/6000 F50's
under various conditions.

You should look at the detail in the report, but in their lab on a F50
(4 cpus) shared memory achieved 63 Gigabytes/hour. TCP/IP on FDDI
achieved 32.44 Gigabytes an hour.  Both are pretty impressive.

Remember, the only guarantee with a bench mark is that you will not
exceed what they achieved.

Michael

> -----Original Message-----
> From: Carl Makin [SMTP:Carl.Makin AT IPAUSTRALIA.GOV DOT AU]
> Sent: Thursday, April 30, 1998 07:24 AM
> To:   ADSM-L AT VM.MARIST DOT EDU
> Subject:      SHMEM or TCP/IP?
>
> We're running ADSM v3.1.1.1 on AIX 4.2.1 on a 2 cpu F50.  We're trying
> to backup 9 million 40kb tiff images.
>
> Currently it is setup to use Shared Memory for the client<->server
> communications.
>
> Does anyone have any experience in the relative performance of using
> shared memory over tcp/ip for backups and restores.
>
> Restore performance for us is a bit of a problem as we currently
> calculate it will take around 15 days to restore the images in case of
> a complete failure.
>
> Carl.