TS/MP System Management Manual (H06.05+, J06.03+)

Tuning Your System by Using Statistics
HP NonStop TS/MP System Management Manual—541819-007
7-4
I/O Info
REQ CNT
REQ CNT indicates the number of requests for a link to a server that could not be
satisfied immediately because of the unavaialability of a link or when the link manager
is in the process of requesting a link.
You can compare this number with the REQ CNT number for I/O INFO (see I/O Info
earlier in this section) to determine what percentage of the transactions requesting a
link to a particular server experienced some delay.
In a well-tuned system (with no dynamic servers), the only delay should be at startup
time, when initial link(s) are granted to servers in the server class. If statistics are reset
after startup, the server queue counts should be 0. If the server queue counts are not
0, then you should increase the number of static servers.
% DYNAMIC
The higher the number indicated for % DYNAMIC, the greater the chance that a
dynamic server will be required. It is important to realize that this number does not
indicate:
•
That dynamic servers were in fact started. It does indicate, however, that some
requests were delayed anywhere from not at all to the time specified with the SET
SERVER CREATEDELAY command.
•
The number of dynamic links granted by the PATHMON process. Any request on
the LINK queue can be cancelled by the availability of another existing link.
If the number for %DYNAMIC is large, you might want to increase the number of static
servers.
I/O Info
The I/O INFO section in the statistics display provides information about I/O operations
to and from the server class.
Example 7-3 shows only the I/O INFO section of the sample server statistics. See this
figure as you read this section.