Explanation
The swap request (operator-initiated or system-initiated,
as per message IGF500I) will not complete until the operator responds YES or NO to
this message.
This message is issued at the start of a swap
sequence.
Note: This message will not be issued for tape devices attached
to a tape library, and it will also not be issued for SMS managed
mountable devices.
System action
The system continues processing. The operator-initiated
request will not complete until the operator responds to the message.
The ‘YES’ or ‘DEVICE’ reply invokes the DDR
function. The ‘NO’ reply causes a permanent I/O error
to be posted for device dev1, operator SWAP command
to be canceled as appropriate.
Operator response
- If a SWAP to device dev2 is desired, reply ‘YES’.
For tape devices, message IGF502E will be issued and a tape must be
mounted on dev2 before swap can successfully complete.
This must be done in a timely manner. Resources during this time may
be restricted and can potentially cause hangs until this tape mount
is satisfied.
- If a SWAP is desired, but device dev2 is not
acceptable, enter the device number of the device to which the volume
on dev1 is to be moved. Make sure that the device
has an available path before entering this reply.
- If a SWAP is not desired, enter reply ‘NO’.
- If PAGING I/O ERROR appears in the message text, one or more jobs
will almost certainly be ended if a ‘NO’ response is given.
Note: - When continuing with the SWAP, either by answering ‘YES’
or a device number, do not move the volume until the ‘PROCEED’
message, IGF502E, is issued or data set integrity may be lost.
- If device dev1 is a 3340/3344 device with the
fixed-head feature, device dev2 must also have
the fixed-head feature.
- If you are using magnetic tape units and dev1 contains
reels of different tape densities for input, be sure that dev1 and dev2 have
the same dual density capability.
- If device dev2 was offline, the system might
request operator intervention (via message IEA000A) before it can
issue message IGF502E. If so, mount a scratch tape. It will be unloaded,
and then message IGF502E will be issued.
Caution: If the volume is a direct access
storage device, care must be taken to ensure that no head-disk interference
("head crash") problem exists.
Source
Dynamic device reconfiguration (DDR)
Module
Routing code
Descriptor code