User`s guide

Table 3–8 SW300-Series Cabinet Shelf Configuration
Field Replaceable Unit Minimum Maximum
StorageWorks building block (SBB) shelf power supplies 4 8
3½-Inch storage SBBs 0
1
24
5¼-Inch storage SBBs 0
1
8
HS array controllers 1 2
Controller cache modules 0 2
Environmental monitor units (EMUs) 1 2
AC power entry controllers 1 2
Dual speed blowers 8 8
1
Minimum of one for both 3½-inch and 5¼-inch SBBs.
The SW300-series cabinet shelf is called a ‘‘deskside RAID’’ configuration because
its design allows for the easy creation of storagesets (stripesets and RAIDsets).
Although you can configure 3½-inch and 5¼-inch SBBs in any combination within
this shelf, Digital recommends that you take advantage of the shelf layout for
storagesets.
The SW300-series cabinet shelf includes an integrated backplane that contains
six single-ended SCSI device buses. The backplane device buses eliminate the
need for external device cabling to the controller device ports.
Each device bus runs vertically, attaching to up to four SCSI devices (IDs 0–3).
The controller slots in the lower portion of the shelf occupy SCSI IDs 6 and 7, in
much the same way as in a BA350–MA shelf.
Note
The vertical arrangement of the SW300-series cabinet shelf device buses
marks a departure from the convention established with BA350–SB
storage shelves. Devices arranged horizontally in a BA350–SB shelf are
typically on the same controller port. However, horizontally arranged
devices in SW300-series cabinet shelf are each on a different controller
port.
This layout allows storagesets, which normally consist of devices on
different controller ports (for best performance and availability), to be
arranged as horizontal groups of devices.
The SW300-series cabinet shelf SCSI device bus configuration appears in
Figure 3–12.
See the StorageWorks Solutions SW300-Series RAID Enclosure Installation and
User’s Guide for more information on this shelf.
Configuration Rules and Restrictions 3–23