If the mainframe is using the silo, you will be running HSC on the mainframe
to control the silo.  If you have open systems silo clients, as Legato or ADSM
on open systems will be, you will need to run Library Station on the mainframe
as the library control server.  You cannot use ACSLS if a mainframe is sharing
the silo - ACSLS is the silo control server for open systems only
environments.

My understanding is that Legato has client-directly-to-tape capability, which
ADSM does not have.  However, if the mainframe is sharing the silo, then the
mainframe MUST be controlling the silo -- meaning even though legato clients
can talk to tape independent of the mainframe, they cannot get a tape mounted
independently of the mainframe.

Open Microsystems sells middleware (Enterprise DistribuTAPE - EDT) from ADSM
to ACSLS and Library Station, allowing very nice support of ADSM and STK
equipment.  EDT supports all manner of library sharing, as well as DRIVE
sharing among multiple ADSM servers, and access to remote drives and libraries
over either a network or SCSI multiplexers.  EDT runs on the open systems
platforms only (not MVS).

If anybody wants more information on EDT, email me privately.

Regards,
John Groves

Julie Phinney wrote:

> Legato is being considered at my company because (and this is just my
> understanding, could be wrong)  Legato allows you to direct-connect backup
> clients to mainframe attached STK silos.  Even when the mainframe is down.
> You'd need an AIX box or something for the Legato indexes to reside on.
> With ADSM there is no direct-connecting to those silos.
> Can anyone verify this?  Can ADSM clients backup direct to the silos
> without running through the AIX box?
> Julie