ADSM-L

Re: Multiple ADSM Servers

1997-01-08 08:32:00
Subject: Re: Multiple ADSM Servers
From: Hilton Tina <HiltonT AT IS1.INDY.TCE DOT COM>
Date: Wed, 8 Jan 1997 08:32:00 EST
We've had ADSM on an SP (wide node) since July.  We recently added an SMP
node to the configuration and are backing up that node across the switch
with no problem.  Of course, we only have client code there.

As for your tape questions, if I understand your problem correcly, you are
adding a second server because you need more 3590s and you don't have the
slots available on your current server node.  Another alternative would be
to check out IBM's NetTape.  It allows you see tape drives on other machines
and it does have an interface with ADSM.  We looked at it briefly, but not
long enough to get it working with ADSM and management decided against
purchasing it.

Tina Hilton
Thomson Consumer Electronics
 ----------
From: Alan R.White
To: Multiple recipients of list ADSM-L
Subject: Multiple ADSM Servers
Date: Wednesday, January 08, 1997 6:16AM


Has anybody ever run multiple AIX ADSM servers all working with one 3494?
We're running the server on an SP wide node and have managed to shoehorn 4
SCSI controllers in for the 3590 drives in the library. We've still got
more client machines to migrate to ADSM and some of them have large volumes
of data to backup so 2 more 3590s have arrived. Problem is we know from
past experience that its just not worth putting more than one 3590 on a
SCSI controller.

The only answer we can come up with is to run a second ADSM server on
another node with adequate MCA slots free for the SCSI connections to, say,
the two new 3590s in the library and start putting clients onto this one.
This will bring more administration overheads for us and some possible
areas of confusion. Can anyone see any other problem areas running these
two ADSM servers against a single 3494, containing 6 3590 drives, two of
which are managed by one server, four by the other?

We're doing what we can to minimise tape drive contention but contention
does exist and hence the need for more drives. Anyone any experience of
running ADSM on a high-node? These have 16 MCA slots and would allow us to
continue with one ADSM server but we've heard that the high-speed switch
code doesn't perform well on an SMP machine.

Thanks in advance
Alan White
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