Compaq TruCluster Server AA-RHGWB-TE, Manual

Page: 63 / 320

_____________________ Note _____________________
Dual power supplies are recommended for any BA356 shelf
containing a DS-DWZZH-05 UltraSCSI hub in order to
provide a higher level of availability between cluster member
systems and storage.
• The lower righthand device slot of the BA370 shelf within the RA7000
or ESA 10000 RAID array subsystems. This position minimizes cable
lengths and interference with disks.
A DS-DWZZH-05 UltraSCSI hub uses the storage shelf only to provide its
power and mechanical support (it is not connected to the shelf internal SCSI
bus).
______________________ Note _______________________
When the DS-DWZZH-05 is installed, its orientation is rotated
90 degrees counterclockwise from what is shown in Figure 3–3
and Figure 3–4.
The maximum configurations with combinations of DS-DWZZH-03 and
DS-DWZZH-05 UltraSCSI hubs, and disks in the same storage shelf
containing dual 180-watt power supplies, are shown in Table 3–3.
______________________ Note _______________________
With dual 180-watt power supplies installed, there are slots
available for six 3.5-inch SBBs or two 5.25-inch SBBs.
Table 3–3: DS-DWZZH UltraSCSI Hub Maximum Configurations
DS-DWZZH-03 DS-DWZZH-05 Disk Drives
a
Personality
Module
b c
5 0 0 Not Installed
4 0 0
Installed
3 0 3 Installed
2 0 4 Installed
1 0 5 Installed
0 2 0 Not Installed
3 1 0 Not Installed
2 1 1 Installed
Shared SCSI Bus Requirements and Configurations Using UltraSCSI Hardware 3–11