Partitioning—General
252 SL150 Interface Reference Manual Julyl 2017
Partitioning—Shared Mailslot Behavior
When the library is partitioned, the mailslots become a shared resource. When a
partition needs access to the mailslots, the operator must use the ASSIGN action in
the user interface to assign the partition to the mailslots before initiating an import or
export operation. Refer to the SL150 Users Guide for help.
A Partition-Mailslot assignment gives a partition exclusive ownership of the shared
mailslot. This ensures that cartridges are always entered into the correct partition and
prevents the other partitions from taking ownership of a shared mailslot that is
already in use.
If the mailslot is not assigned to the partition, a SCSI host application connected to
the partition will receive status from the library that indicates the mailslot is open.
When a SCSI host application receives status that the mailslot is open, the application
will direct the operator to either close the mailslot or ASSIGN the mailslot to the
partition. The SCSI host application cannot tell the difference between an open
mailslot and a shared mailslot that has not been assigned to the partition.
The following SCSI commands will return mailslot open status when the mailslot is
not assigned to the partition or when the mailslot is actually open:
• A SCSI MOVE command to or from a mailslot element. The command will end in
Check Condition Status. The sense data will indicate Not Ready, Mailslot Open
(Sense Key = 2h, ASC = 3Ah, ASCQ = 02h).
• A SCSI READ ELEMENT STATUS command that includes the mailslot elements.
The command will end in GOOD status. The Import/Export Element Descriptor
data for the mailslot element will return an exception condition indicating that the
mailslot is open; the Except Bit will be set to 1, the ASC field will be set to 3Ah,
and the ASCQ field will be set to 02h.
9. Right magazine front
10. Module 10 (Expansion)
11. Partition 1 resource
12. Partition 2 resource
13. Shared resource
14. Reserved slots (configurable, shared resource)
FIGURE B-1 Example of a 10 Modular Tape Library with 2 Partitions, 3 Reserved Cells, and the
Standard Mailslot Configuration
To Next Page
Loading...
Need help?
General