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onstat -g iob Big Buffer Usage by IO VP Class

The onstat -g iob command displays the status of big buffer usage in the system by I/O virtual processor class. 

AIO big buffer usage summary:                                                
class                 reads                                   writes         
       pages    ops  pgs/op  holes  hl-ops hls/op      pages    ops  pgs/op  
 kio  37276    9220   4.04   1285     311   4.13       17080   9161   1.86   
 adt      0       0   0.00      0       0   0.00           0      0   0.00   
 msc      0       0   0.00      0       0   0.00           0      0   0.00   
 aio    368      68   5.41      0       0   0.00         368     68   5.41   
 pio      0       0   0.00      0       0   0.00           0      0   0.00   
 lio      0       0   0.00      0       0   0.00           0      0   0.00

Output Description

Heading Description Format See Also
class The class of I/O virtual processor. Str onstat -g glo
reads: pages The total number of pages read by this class of I/O vp. Dec onstat -g ioq
ops The number of read operations that have occurred (I/O). Dec  
pgs/op The average number of pages read per I/O. Flt  
holes The number of non-contiguous blocks read in during an I/O operation. Dec  
hl-ops The number of operations where a hole was found. Dec  
hls/op The average number of holes per operation where a hole was found. Flt  
writes: pages The total number of pages written by this class of I/O vp. Dec  
ops The number of write operations that have occurred (I/O). Dec  
pgs/op The average number of pages per I/O write operation. Flt  

Notes

    Holes can only occur within read operations. They are caused from the system attempting to perform an aggregate read (i.e., more than one page at a time) to optimize performance, but there are pages within the read that aren’t needed.

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