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9176/D173 D
ISK SUBSYSTEM - SITE PREPARATION GUIDE 5
S
IXTH EDITION
NOTE RDAC works on Windows NT, 2000, and on Solaris platforms. Other servers/
operating systems have a similar host-specific software application.
In the event of a loss of a hardware device or cable-path along the way, alternate paths
may be used. RDAC maintains a list machine names, and automatically inquires and links
to them via alternate paths when the primary path is lost. The following illustration depicts
how RDAC (and its companion software) works.
NOTE RDAC hides the secondary path, and automatically handles path failover and
fail-back. LVM requires one to manually set-up primary and secondary paths.
Novell Netware and LINUX use the failover features of special Qlogic drivers.
Model Description
The following tables describe the StorageTek Disk Subsystem models that are currently
available.
Table 1 D173 “entry level” Model
Model Description Storage Capacity
D173-001 A D173 Disk Controller Array
with 128 Mbytes of cache, one
host interface, and one drive
interface per controller. It also
has 10 drive module slots for
72 or 180 Gigabyte drives
The D173 disk subsystem has a
performance maximum of 30 drive
modules using either 72 or 180
Gigabyte drives.
May be upgraded to enable up to
200 drives (14.4 TB current max.).
LUN 0, 1
LUN 2, 3
LUN 0, 1
LUN 2, 3
Secondary:
2, 3
0, 1
Secondary:
2, 3
0, 1
Primary:
0, 1
2, 3
Primary:
0, 1
2, 3
0, 1,
2, 3
0, 1,
2, 3
0, 1,
2, 3
0, 1,
2, 3
Host with RDAC
Disk Subsystem with AVT
NT
2000
Solaris
A
B
Host with RDAC
Disk Subsystem with AVT
NT
2000
Solaris
AA
BB
LUN 0, 1
LUN 2, 3
LUN 0, 1
LUN 2, 3
Host with LVM
HP-UX
SGI
AIX
Disk Subsystem
A
A
BB