TMF Reference Manual (G06.26+)

TMFCOM Commands
HP NonStop TMF Reference Manual—522418-003
3-112
ALTER TMF
System to send the GoRemote request to the TMP, you can select one of the
following values:
PIO
requests TMF to use the PIO mechanism (which includes PIO buffering) to
send GoRemote requests to the TMP.
PIOPRIORITY
requests TMF to use the PIO mechanism to send GoRemote requests to the
TMP and place these requests ahead of transaction-completion operations in
the TMP’s queue.
MSG
requests the use of the operating system’s Message System to send
GoRemote requests to the TMP. MSG is the default setting.
RESET GOREMOTE selects the default setting, MSG.
PIOBUFFER {(piobuffersize, maxpiosperbuffer, piodelaytimer)
|OFF}
RESET PIOBUFFER
alters the configuration of the transport buffer used in distributed transactions.
Collectively, the PIOBUFFER parameters determine when a transport buffer’s
content is sent to its destination processor. Altering any of these values changes
the point at which the buffer content is sent. The parameters are:
piobuffersize
specifies the size, in bytes, of the transport buffer that TMF allocates for PIOs.
piobuffersize can range from 600 through 1800. The default is 600.
maxpiosperbuffer
specifies the maximum number of library broadcast elements (LBEs) that a
buffer can hold before its content is sent. maxpiosperbuffer can range
from 1 through 100. The default is 1 (which specifies no PIO buffering). When
you set maxpiosperbuffer to 1, the piobuffersize and
piodelaytimer values are irrelevant.
Caution. For most systems, the standard default settings supplied by TMF for the
PIOBUFFER parameters are adequate. Before changing these parameters to other settings,
you should have a high-level TMF background and a clear understanding of the impact of
these parameters on your particular configuration; inappropriate settings could drastically affect
system performance. For safe and effective use of these parameters, please contact the
Global Customer Support Center (GCSC) or your service provider.