Yes -- it looks funny, but it works.

Set up FOUR entries in your dsm.sys -
1) Servername server-a
   TCPserveraddress     nic-card-1
2) Servername server-b
   TCPserveraddress     nic-card-2
3) Servername server-c
   TCPserveraddress     nic-card-1
4) Servername server-d
   TCPserveraddress     nic-card-2

Then, in the initSID.utl:
1) maxsessions=4
2) define a SERVER stanza for each of the four server definitions in the
same order, with SESSIONS 2.

If everything is working correctly, you will run two sessions to server-a
and two to server-b. If nic-card-1 fails, you will get errors on server-a,
two sessions on server-b, errors on server-c, and two sessions on server-2
-- for a total of four sessions on nic-card-2.
You will need to have the two cards on two different subnets or networks!
You will need to have the two cards on two different subnets or networks!

I run two gigabit cards on two seperate networks (and have an additional set
of 100 MB cards on additional networks as an additional layer of redundancy)
and am currently limited by the speed of the Quantum DLT7000 drives at 7 to
9 MB/Second over a three-hour period.

You'll also need to set PASSWORDREQUIRED YES in the stansas, and initialize
the passwords with backint according to the documentation (at least, I need
to with the ADSM 3.1 client; haven't tried the 3.7 client yet) as the
generated ADSM password only works with the server nic address used in the
normal B/A client dsm.sys.

Tom Kauffman
NIBCO Inc

> -----Original Message-----
> From: Darrell Kundrik [mailto:Darrell_Kundrik AT TRANSALTA DOT COM]
> Sent: Thursday, December 07, 2000 10:25 AM
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: Two ethernets for redundancy/performance?
>
>
> We are running NSM here with a gigabit ethernet card on a
> private network
> to back up clients. We would like to install a second gigabit card for
> extra throughput and failover in case one card should happen
> to die. In the
> initSID.utl or the dsm.opt files, it looks like I can set:
>
> MAX_SESSIONS        4         #we have 4 tape drives
>
> SERVER              server_a
> SESSIONS            2
> TCPSERVERADDRESS    xxx.xxx.xxx.xxx      #address of 1st card
>
> SERVER              server_a
> SESSIONS            2
> TCPSERVERADDRESS    yyy.yyy.yyy.yyy      #address of 2nd card
>
> This should give increase bandwidth and a certain amount of
> failover. Is
> there any method to achieve SESSIONS=4 if one of the cards
> should fail?
>
> Thanks,
> Darrell Kundrik
>