Creating an Entry in the
each unique
foresee generating several versions of the
define extra entries in the system name table when you generate
the system name table. If you should have to regenerate the
discussion about the GENERATE EXEC procedure in
Reserving
reserved on a
sufficient to contain the number of pages specified in the
follows:
These additional pages are used to store the reference table
information provided by the
two-channel
be attached to
control units. This allows the control program up to eight paths to a
given device when the maximum number of alternate channels and alternate
control units are specified.
device,
the device.
is busy, there may exist an alternate path(s) that is available.
Instead of the
on an alternate path. In the case where no available path to the device
exists, alternate path
the request is queued off multiple busy/scheduled paths and the first
path to become available will be the path the
approach has some distinct advantages over approaches used by other
operating systems:
1. The
eliminates the arbitrary choice of queuing based on number of
encountered, etc.
2. No single user is penalized more than any other user.
3. The first in, first out
An example of alternate path usage is shown in the section