Storage Attached Via 3830 Storage Control Model 2 - IBM System/370 145 Manual

Inline and online testing allows CE diagnosis and repair of most
3330-series drive failures without the necessity of taking the entire
3330-series string out of the system configuration.
Model 2
The 3830 Storage Control Model 2 unit is functionally equiva1ent to
the 3830 Storage Control Model 1 unit, as the Model 1 is previously
described, except for the following:
• Two strings of up to eight drives each can be attached to a channel
via Model 2 of the 3830. When multiple requesting is used, the 3830
Model 2 can control up to 16 channel programs concurrently, one on
each of its drives. Only one of the 2 to 16 drives attached to 3830
Model 2 can be transferring data at any given time.
• The 3830 Model 2 does not contain power for any of the 2 to 16
drives that can be attached to it.
• The 3830 Model 2 does not contain the device-oriented hardware that
is present in Model 1 of the 3830.
• Inline diagnostics for a malfunctioning drive must be executed using
the CE panel on the 3333 module.
Model 2 of the 3830 can have one or two strings of drives attached to
it. Each string must include 3333 Disk Storage and Control as the first
module attached to Model 2 of 3830 Storage Control. Up to three 3330
Disk storage modules can then be added to each string for a total of
eight drives per string. A 3333 module contains the power required for
an eight-drive string and the device-oriented hardware that is not
present in the 3830 Model 2. Only one 3333 module can be present in
each string. A 3333 module is connected to a 3830 Model 2 via cables
which can be a maximum of 150 feet in length. The 3830 Model 2 attaches
to an integrated selector or block multiplexer channel in the Model 145
via a cable up to 150 feet in length. Model 1 of 3830 storage Control
can
be
field-converted to Model 2. Field conversion of Model 2 of 3830
storage Control to Modell is not recommended. Figure 20.10.2 shows a
Model 145 configuration with 3330-series disk storage attached via 3830
Storage Control Model 2.
CPU with integrated selector
or block multiplexer channel
connected to 3830 Storage
Control Model 2
Model 145
~I
Cables
29.5"
~
Storage
Control
Model 2
bles
.1==:
3333
Device-oriented
control
functions and
2 drives
Cables
3333
Device-oriented
control
functions and
2 drives
3330-Series string
3330 3330
2 drives 2 drives
3330-Series string
3330 3330
2 drives 2 drives
/
Figure 20.10.2. A Model 145 configuration with 3330-series disk
storage attached via 3830 Storage Control Model 2
3330
2 drives
3330
2 drives
The Two-Channel Switch and the Two-Channel Switch, Additional
features can be installed on a 3830 Model 2 unit to enable the strings
100 A Guide to the IBM System/370 Model 145