onstat -g ioq command: Print I/O queue information

Use the onstat -g ioq command to display statistics about the number and types of operations performed by I/O queues.


Syntax:

>>-onstat-- -g--ioq--+------------+----------------------------><
                     '-queue_name-'

If a queue_name is given then only queues with that name are shown. If no queue_name is given then information is given for all queues.

Example output

Figure 1. onstat -g ioq command output

AIO I/O queues:
q name/id    len maxlen totalops  dskread dskwrite  dskcopy
sqli_dbg   0      0      0        0        0        0        0 
 fifo   0      0      0        0        0        0        0 
  adt   0      0      0        0        0        0        0 
  msc   0      0      1      537        0        0        0 
  aio   0      0      3     6537      238     5777        0 
  pio   0      0      2     1103        0     1102        0 
  lio   0      0      2    11795        0    11794        0 
  gfd   3      0     17    17489     1526    15963        0 
  gfd   4      0     17    18347     2384    15963        0 
  gfd   5      0     16      220       41      179        0 
  gfd   6      0      4        4        0        4        0 
  gfd   7      0      4        4        0        4        0 
  gfd   8      0      4        4        0        4        0 
  gfd   9      0      9       54       24       30        0 
  gfd  10      0     16      149       40      109        0 
  gfd  11      0     16      621      128      493        0 
  gfd  12      0     16     1953     1146      807        0 
  gfd  13      0     16      409       71      338        0 
  gfd  14      0     16      378       60      318        0

Output description

q name/id

The name and number of the I/O queue. The name indicates what type of queue it is. The number is used to tell queues of the same name apart.

Here is a list of the possible queue names and what each type of queue handles:

sqli_dbg: Handles I/O for Technical Support's SQL Interface Debugging feature
fifo: Handles I/O for FIFO VPs
adt: Handles auditing I/O
msc: Handles miscellaneous I/O
aio: Handles HCL Informix® asynchronous I/O
kio: Handles kernel AIO
pio: Handles physical logging I/O
lio: Handles logical logging I/O
gfd: Global File Descriptor - Each primary and mirror chunk is given a separate global file descriptor. Individual gfd queues are used depending on whether kaio is on and the associated chunk is cooked or raw.

len

The number of pending I/O requests in the queue

maxlen

The largest number of I/O requests that have been in the queue at the same time

totalops

The total number of I/O operations that have been completed for the queue

dskread

Total number of completed read operations for the queue

dskwrite

Total number of completed write operations for the queue

dskcopy

Total number of completed copy operations for the queue