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.