IBM SY33-0193-00 manual To Set Service Mode with the DOS Configurator

Service Mode

A disk

drive

must

be placed in Service Mode before

it

can be removed from

the

SS

loop

and

maintenance

performed on

it. When

Service

Mode

is

set:

Ÿ

The

Check

light

of the disk drive comes on for identification.

Ÿ

All

SSA

loop

activity through the disk drive stops.

Ÿ

The

disk

drive

motor

stops.

Ÿ

The

Check

light

(if

present)

of the

enclosure

that

contains the selected

disk

d

comes on.

Ÿ The SSA loop is broken and no communication to the disk is possible.

Only one disk drive at a time can be in Service Mode.

Before using this service aid, you must make the selected disk drive unavailable t system; otherwise, an error occurs.

SSA

devices

can

be maintained

concurrently;

that

is, they

can be

removed,

installed,

and

tested

on

an

SSA

loop

while the other

devices

on

the

loop

continue to

work

normally. If

a

disk drive has its Check light

on,

you

can

remove

that

disk

drive fr

SSA

loop

without

taking

any

special

actions.

If

a

disk

drivenot

havdoes its

Check

light on,

the

SSA

loop

that

passes

through

it

might

still

be

active, although the disk drive

itself

might

not

be

working. You must

that

disk drive into

Service

Mode

before

you

remove

it

from

the

SSA

loop.

To Set Service Mode with the DOS Configurator

1.Start the DOS Configurator (see “Accessing Service Aids from the DOS Configurator” on page 29) and SSAselectAdapter List .

2. Select		the required	adapter	from the list, then fromDiskthe Adapter Menu select
Service	Aids .
The	Disk	Service Aids	window is	displayed.

Service Aids and Other Utilities31