Compaq AA-RHGWB-TE manual DS-DWZZH UltraSCSI Hub Maximum Configurations

_____________________ 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 Drivesa	Personality
			Moduleb 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