Technical data

10.4.4.2 Cabling an HSZ20 in a Cluster Using External Termination
To connect a SWXRA-Z1 (HSZ20 controller) to a shared SCSI bus, follow
these steps:
1. Referring to the RAID Array 310 Deskside Subsystem (SWXRA-ZX)
Hardware User’s Guide, open the SWXRA-Z1 cabinet, locate the SCSI
bus converter board, and:
• Remove the five differential terminator resistor SIPs.
• Ensure that the W1 and W2 jumpers are installed to enable the
single-ended termination on one end of the bus.
___________________ Note ___________________
The RAID Array 310 SCSI bus converter board is the
same logic board used in the DWZZB signal converter.
2. Attach an H885-AA trilink connector to the SCSI input connector (on
the back of the cabinet).
3. Use a BN21K or BN21L cable to connect the trilink connector to a
trilink connector or BN21W-0B Y cable attached to a differential SCSI
controller, another storage shelf, or the differential end of a signal
converter.
4. Terminate the differential bus by attaching an H879-AA terminator to
the H885-AA trilink connector or BN21W-0B Y cable at each end of
the shared SCSI bus.
Ensure that all devices that make up the shared SCSI bus are connected,
and that there is a terminator at each end of the shared SCSI bus.
10.4.5 Cabling an RA3000 Using External Termination
The RAID Array 3000 (RA3000) is a low-end, standalone UltraSCSI RAID
subsystem. It supports RAID levels 0, 1, 0+1, 4, 5, and JBOD disks.
The RA3000 storage subsystem has fully redundant components to eliminate
single points of failure. It comes with a standard uninterruptible power
supply (UPS) for cache data protection during power outages.
The RA3000 uses the dual-ported HSZ22 controller. Optional dual redundant
controllers with mirrored write-back cache provide maximum data integrity.
For more information on the RA3000, see Section 3.7.1.3.
Configurations Using External Termination or Radial Connections to
Non-UltraSCSI Devices 10–29