Monitor chunk I/O activity with the onstat -g iof command
Use the onstat -g iof command to monitor chunk I/O activity, including the distribution of I/O requests against the different fragments of a fragmented table.
The onstat -g iof command displays:
- The number of reads from each chunk and the number of writes to each chunk
- I/0 by service level, broken down by individual operation
- The type of operation
- The number of times the operation occurred
- The average time the operation took to complete
If one chunk has a disproportionate amount of I/O activity against it, this chunk might be a system bottleneck.
For an example of onstat -g iof output, see information about the onstat utility in the IBM® Informix® Administrator's Reference.