8.1.3
Inventory Validation
When the inventory database is invalidated, the RLS scans all locations before it does
anything else, and stores the new cartridge location information in its internal
inventory database. The inventory database will be invalidated by:
•
Loss of RLS Power
•
Opening a storage matrix
After an inventory invalidation:
•
The RLS re-scans all locations before it does anything else, to update its internal
inventory database.
•
Since the host initially has no way of knowing what changes were made to the
inventory, the changer sends the host a
CHECK CONDITION
message to notify the
host that changes have occurred. The host should then ask for the new information.
If a barcode reader is installed and barcode labels are affixed to the cartridges,
barcode information is also stored as part of the inventory information.
NOTE
If the move a cartridge function is used on the Operation page, the changer’s internal inventory
database is updated, but the host is not informed about the move. In addition, no
CHECK
CONDITION
is sent to the host.
8.2
Logical Libraries
When shipped from the factory, all RLS-8350/85XX libraries look like a single library
with all of its tape drives and storage slots dedicated to the random operation of
partition number 1. This is generally the correct configuration for a single-host system
running a library specific backup application.
However, when multiple hosts are present and each host needs to run a library
specific backup application, then the RLS can be sub-divided into smaller
logical
libraries.
Physically, there is still one cabinet with one SCSI Medium-changer within
it. That Medium-changer senses the SCSI ID of the host computer that is selecting it
and can therefore indicate to that host that only a pre-determined (via the
configuration process) list of physical resources are available to it. Up to five of these
library partitions are available in a single RLS-85XX while an RLS-8350 can have up
to three. When the FastPass elevator expansion option is used, up to four RLS-85XX
libraries can be interconnected for a total of up to 20 potential partitions.
If more than one logical library is to be defined, then a list of tape drives and cartridge
locations for each of logical library must be made. No overlapping of resources (for
either logical libraries or sequential drives) is allowed and the allocations need not be
equal.
8-4
Resource Management
511000 Rev. F
