OSI/AS SCF Reference Manual

Table Of Contents
OSI/AS Trace Facility
OSI/AS SCF Reference Manual424121-001
3-87
L5 PROVL5 Issue Read
Read Count
shows the maximum number of bytes to be read from transport. Session posts an
initial read of 300 bytes when it does not know whether transport has data to return.
If this initial read is returned with a “more data to follow” completion, the next reads
posted will be for 1,500 bytes. Reads of 1,500 bytes are repeated until the whole
transport TSDU has been read. When the last fragment of the TSDU has been
handled, session will revert to a 200 byte read.
L5 PROV—L5 Issue Read
This trace record shows a file-system NOWAIT read operation initiated. If an error is
returned, the I/O will not reach transport and therefore no I/O completion will occur.
If the session is operating in loopback mode, Tag will be set to 10 and no transport will
be initiated. Instead, session checks for write data queued by the loopback partner.
Subtype
L5 Issue Read
SU Name
shows the name by which APS knows this connection.
File ID
an internal field that shows the TAPS file control block ID.
Tag
shows an internal field that shows the type of read being initiated. The possible
values are
DCB Addr
an internal field that shows the address of the buffer containing the data being
written to a transport subdevice.
Read Count
shows the maximum number of bytes to be read.
08:20:07.960 >000.000 #179 TAPS L5 PROV
L5 Issue Read Su Name #ZMF0020 File ID %H00012500 Tag %H00000005
DCB Addr %H001C5192 Read Count 00200 FS Error 00000
Value Meaning
5 read
10 loopback read