Julyl 2017 Host Application Best Practices 19
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Host Application Best Practices
Running on Both Fibre Channel or SAS Ports
When the drive has 2 ports, Oracle recommends that Host Application treat the
second SL150 drive port as a fail over port. The library may report a CHECK
CONDITION to a command received on one port, when the other port is already
busy with a library command. When a host application receives either of the
following new CHECK CONDITIONs, it should reissue the command:
• Not Ready, Logical Unit Offline (02/04/12h)
• Aborted Command, Logical Unit Communication Failure (0Bh/08/00)
• No Sense, Operation in Progress (00/00/16h)
Logical Unit Number Addressing
• LUN 0 is used to communicate with the tape drive.
• LUN 1 is used to communicate with the SL150 library.
Drive Element Addressing Mode Configuration
The administrator for the SL150 Modular Tape Library can chose one of the following
two drive element addressing modes. The mode chosen affects the way SCSI element
addresses are reported over the library SCSI interface.
• Address All Drive Slots
• Address Installed Drives Only
Address All Drive Slots
Setting the mode to Address All Drive Slots results in the following:
• All drive slots (empty or installed) are reported to the host application over the
library SCSI interface. Using this mode allows for the addition of new tape drives
without restarting the library.
• Each drive and empty drive bay is assigned a drive SCSI Element Address. Drive
element addresses are assigned sequentially starting at 500 for each partition from
the topmost drive in the partition to the bottom drive in the partition. Similarly,
for non-partitioned libraries, drive element address are also assigned sequentially
starting at 500 from the top of the library to the bottom of the library.
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