Table 6 Control Path Assignment During Manual Partitioning - Quantum Scalar i500 User Manual

Table 6 Control Path Assignment During Manual Partitioning
If a partition contains...
Only SCSI or SAS tape drives
Only FC tape drives and the library
itself does not contain any FC I/O
blades
Only FC tape drives and there is at
least one FC I/O blade installed in the
library
FC and SCSI and/or SAS tape drives
and there is no FC I/O blade installed
in the library
FC and SCSI and/or SAS tape drives
and there is at least one FC I/O blade
installed in the library
a. Selecting a control path for a tape drive attached to an FC I/O blade can affect what is displayed during host mapping
configuration. It can also affect what devices are presented to the host application. If a tape drive is seen multiple times by
the host, check to see if a control path has been defined for the partition and remove it. See
page 68 for information on host mapping.
Scalar i500 User's Guide
Then control path assignment is as follows...
The first SCSI or SAS tape drive assigned to a partition is
designated and enabled as the control path tape drive by
default.
The first FC tape drive assigned to a partition is designated and
enabled as the control path tape drive by default.
The FC I/O blade is designated as the control path for the
partition, even if the partition has no tape drives connected to
the FC I/O blade. Proceed as follows:
• In partitions that have tape drives connected to the host
through an FC I/O blade, the FC I/O blade serves as the
control path (no tape drive is configured as a control path
drive). Do not manually select a tape drive as the control path
for this partition unless you select a tape drive that is not
connected to the FC I/O blade. (If you select a tape drive to
host a control path and it is also connected to the FC I/O
blade, you will effectively have two control paths and this can
cause the host to see the same partition multiple times via the
a
FC I/O blade.)
• In partitions that do not have tape drives connected to the
host through an FC I/O blade, you must manually select a
tape drive as the control path for that partition.
• The first tape drive in the partition (FC, SCSI or SAS), will be
assigned as the control path tape drive by default.
• In partitions where the first tape drive is an FC tape drive:
• If the FC tape drive is connected to an I/O blade, the
partition represents an FC partition and the control path is
reported via the FC I/O blade. Do not manually select a
tape drive as the control path for this partition unless you
select a tape drive that is not connected to the FC I/O
blade. (If you select a tape drive to host a control path and
it is also connected to the FC I/O blade, you will effectively
have two control paths and this can cause the host to see
the same partition multiple times via the FC I/O blade.)
• If the FC tape drive is not connected to an FC I/O blade,
you must manually select the FC tape drive and enable it
to host the control path for that partition.
• In partitions where the first tape drive is NOT an FC tape
drive, and therefore not connected to an FC I/O blade, the first
SCSI or SAS tape drive within the partition is designated and
enabled as the control path tape drive by default.
a
Configuring Host Mapping on
43