User`s guide

• Two storage shelves per port (jumpered-pairs)—Two BA350–SB shelves can
be joined on the same controller port with the following restrictions:
– The SCSI–2 cable to the first BA350–SB storage shelf is 1.0 meter or less.
The associated BA350–MA controller shelf must be near enough to satisfy
this restriction.
– The SCSI–2 cable from the first BA350–SB shelf to the second shelf is 0.5
meters or less. This requires two shelves to be immediately adjacent to
each other.
– The first BA350–SB storage shelf is configured for unterminated single
SCSI.
• Any TZ8x7 half-rack tape loader device must be located at the top front (each
tape loader occupies the full cabinet depth) positions, filling the two or four
top BA350–SB shelf positions (front and back). Up to four tape drive loader
devices can be loaded in an SW800-series data center cabinet, displacing
shelves S1 and S12 to S18 (leaving 10 BA350–SB shelves remaining).
Figures 3–2 and 3–3 show the loading sequence for storage and controller
shelves when two or four TZ8xx-series tape devices are installed in an
SW800-series data center cabinet. Refer to the StorageWorks SW800-Series
Data Center Cabinet Installation and User’s Guide for new loading sequence
illustrations for cabinets using 4 GB or larger disk drives.
Single (or paired) TZ8x7 devices must be connected with a 0.2 meter (8-inch)
SCSI–1-to-StorageWorks transition cable (order number 17–03831–01), then
to a 2.0 meter SCSI–2 cable (order number BN21H–02) that connects to one
of the controller’s SCSI–2 ports.
• Using a fourth controller shelf: By convention, the third controller shelf (C3)
would use (only) the top three (or four) storage shelves in the front of the
cabinet; the fourth controller shelf (C4) would use the top three (or four)
storage shelves in the back of the cabinet. (Refer to Figure 3–1.)
• Up to 42 devices can be attached, using seven 3½-inch SBBs in each of six
BA350–SB shelves, attached to controllers with six controller ports.
Note
Redundant power or a dual-redundant controller configuration is not
supported when using 42 devices. This is not a Digital recommended
configuration.
Configuration Rules and Restrictions 3–3