We've done this in the past--mostly in a big disaster situation,
but on principle it works in a production environment.
The key is to set the DSMSERV_DIR environment variable to the
location of your dsmserv.opt file prior to starting each
instance of the server. Most of us never deal with
this environment variable, b/c by default if it is unset ADSM
assumes /usr/lpp/adsmserv/bin.
A quick example startup script for two ADSM servers from one box
might look like this:
#!/usr/bin/csh -f
# Set variables for the location of the different options files
set SERVER1_DIR = /usr/lpp/adsmserv/serv1
set SERVER2_DIR = /usr/lpp/adsmserv/serv2
# Startup the first server
set DSMSERV_DIR = $SERVER1_DIR
nohup /usr/lpp/adsmserv/bin/dsmserv >& /dev/null &
set DSMSERV_DIR = $SERVER2_DIR
nohup /usr/lpp/adsmserv/bin/dsmserv >& /dev/null &
You can find further information on pp. 271-272 of the ADSM for
AIX Administrator's Guide in the section 'Running Multiple
Servers on a Single Machine'.
As to the second question, regarding the 3494, you only need one
lmcpd daemon, but you do need to divide the tape drives manually
between the two servers. What we did is define all of the tape
drives on each server, and then make half of them available on
one server, and half on the other. That way it's very easy to
move drives between the two servers.
Regarding memory consumption, the two main server options that
determine ADSM's memory allotment are "BUFPoolsize" and
"LOGPoolsize".
The main gotcha that we've experienced has to do with sharing a
3494 in general, and not with multiple servers on one machine.
Whenever you share the 3494, you just need to be a little more
cautious in your tape usage, and particularly re-use. We had a
situation where one tape drive was having read problems, and was
ejecting tapes because they were of an unknown type. The tapes
that were ejected got mistakenly put back into the libary as
scratch tapes for the ADSM server which did not originally have
these tapes, and they got overwritten.
-- Tom
Thomas A. La Porte
DreamWorks Feature Animation
tlaporte AT anim.dreamworks DOT com
On Tue, 8 Dec 1998, bbullock wrote:
>Current environment:
> 2 ADSM servers. An R50 w/ 8 CPUs and 1GB RAM, & an R40 w/4 CPUs and 512
>MB RAM. Both running AIX 4.2.1.
> 1 3494 library w/ 12 3590 drives. 8 attached to the R50 and 4 attached to
>the R40.
>
>Our current environment works well for us, but leases are coming up for
>renewal soon and I have been asked to look into the possibility of
>consolidating these 2 ADSM servers onto 1 S70.
>
>Future environment:
> 1 box. An S70 w/ 8CPUs and 2GB ram.
> 1 3494 library w/ 12 3590 drives. All drives attached to the S70.
>
> I have looked into the set up on the S70, and it looks like we can
>get it to support all the SCSI, FDDI, Ethernet and SSA cards we will be
>putting in it. The concerns I have now are related to ADSM, so I need some
>advice.
>
>1. Can I run 2 ADSM Version 3 servers on the same box?
> - I see in the ADSM Version 2 documentation it says I can, but find
>no references in the V3 manuals about it.
> Can anybody point me to a resource that may cover running 2 servers
>on the same box?
>
>2. If the answer to question 1 is "yes", then ...
> - How will it effect my connection to the 3494 library? Will I run 1
>or 2 lmcp daemons on the box?
> - In my current environment, the ADSM server consumes all the memory
>on the box. How do I set a limit on the amount of memory each ADSM
>server can use? (e.g.. limit each server to 1 GB of memory).
> - Any other "gotcha"s?
>
>Thanks,
>
>Ben
>Micron Technology Inc.
>Boise, Idaho
>
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