User`s guide

4.3.3.3 SCSI Host Port Cable Handling Guidelines for HSZ Array Controllers
SCSI host port cables may be removed or replaced with power applied. However,
if you must remove the SCSI host port cables for any reason while power is
applied, do the following:
• If it is at the end of the SCSI host bus, leave the SCSI host port cable and
the terminator connected to the trilink when you remove the trilink from the
controller’s front bezel.
• If it is in the middle of the SCSI host bus, leave both SCSI host port cables
connected to the trilink when you remove the trilink from the controller’s
front bezel.
These actions are necessary to prevent breaking the SCSI bus connection. Take
care not to bend any connector pins when plugging the SCSI host port cables into
the trilink.
Maximum SCSI Host Port Cable Lengths
The maximum terminator to terminator length of the fast and slow SCSI buses,
including all cables and shelf buses, is listed in Table 4–2.
Table 4–2 SCSI Bus Parameters
Bus Type Transfer Rate Meters Feet
8-bit, single-ended 5 MB/s 6 19.68
8-bit, single-ended 10 MB/s 3 9.84
16-bit, differential 20 MB/s 25 82.02
Refer to the StorageWorks Solutions Configuration Guide and the StorageWorks
Solutions Shelf and SBB User’s Guide for more information about SCSI bus
cables and connectors, terminators, and trilink connector blocks.
4.3.3.4 Controller-to-Storage Shelf SCSI–2 Device Cable Guidelines
The following are SCSI–2 device cable length restrictions for HS array controllers:
• Controller to the one BA350–SB storage shelf—2.0 meters maximum.
• Controller to the first (of two) BA350–SB storage shelves—1.0 meters
maximum.
• Controller to the first TZ8x7 tape drive—2.0 meters maximum.
• Controller shelf #1—1.0 meter SCSI–2 cables (typically, in the SW800-series
data center cabinet), or 1.0 meter SCSI–2 cables to front storage shelves and
2.0 meter SCSI–2 cables to the back shelves in the SW500-series cabinet.
• Controller shelf #2—2.0 meter SCSI–2 cables (typically, in the SW800-series
data center cabinet), or 1.0 meter cables to the back shelves and 2.0 meter
cables to the front shelves in the SW500-series cabinet.
• Controller shelf #3—1.0 meter SCSI–2 cables to front storage shelves, and 2.0
meter SCSI–2 cables to the back shelves (typically).
• Controller shelf #4—Typically not used in the SW800-series data center
cabinet.
Installation 4–9