Dbspace I/O

select d.name, fname[15,25] path_name, sum(pagesread) diskreads, 
sum(pageswritten) diskwrites 
from syschkio c, syschunks k, sysdbspaces d 
where d.dbsnum = k.dbsnum 
and k.chknum = c.chknum 
group by 1, 2 
order by 1 

The output is as follows:

name              path_name          diskreads       diskwrites

airgen_idx_dbs   uild95/ltmp             3672             7964
airgen_main_dbs  uild95/ltmp            13545            32903
llog             uild95/ltmp               19            51633
rootdbs          uild95/ltmp              211            43117
temp1            uild95/ltmp             3015             3122
temp2            uild95/ltmp             3218             3317

We can get similar information using onstat -D, which displays disk reads and writes
for each chunk, and onstat -g ioq which displays disk I/O waiting queue information.