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Full Discussion: IO queue maxtime over 1 minute
Operating Systems AIX IO queue maxtime over 1 minute Post 303009222 by veslar on Monday 11th of December 2017 06:31:25 AM
Old 12-11-2017
IO queue maxtime over 1 minute
We are experiencing around 1minute IO delays on Oracle DB including both read and write operations even for writing <1kB or reading single 8kB block. Below is the output of iostat -D -T 60 1000 for the problematic time periods
Code:
asmdata03       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         99.3    334.6K     1.4      331.1K       3.5K  20:17:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                          1.3      9.5      1.0     33.0           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.2      0.9      0.7      1.3           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                          8.9S     0.0      1.1M     0.0       11.0         0.0
asmdata08       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         99.5    518.4K     2.9      511.2K       7.2K  20:22:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                          1.9     13.7      0.9     49.2           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.9      0.7      0.9      1.6           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                          6.0S     0.0      1.1M     0.0       15.0         0.1
asmdata17       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         86.5      4.7M    18.7        4.7M       2.0K  22:25:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                         18.1     15.2      0.1     69.9           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.6      1.3      0.7      8.4           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                        696.0      0.0      1.1M     0.0       10.0         0.0
asmdata10       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         84.2     29.4M   113.1       29.4M     546.1   22:35:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                        113.0      1.5      0.1      7.7           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.1      0.9      0.0      0.0           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                         10.6      0.0      1.1M     0.0        1.0         0.0
asmdata15       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         92.2      6.4M    31.2        6.4M     136.5   22:40:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                         31.2     16.4      0.2     96.8           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.0      1.5      1.5      1.5           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                        530.0      0.0      1.1M     0.0       13.0         0.6
asmdata06       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         93.0      6.7M    26.4        6.7M       3.7K  22:45:10
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                         25.6     18.8      0.4     82.0           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.8      1.0      0.6      6.6           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                        632.2      0.0      1.1M     0.0       13.0         0.5
asmdata05       xfer:  %tm_act      bps      tps      bread      bwrtn      time
                         76.9     20.7M    79.0       20.7M     273.1   06:59:11
                read:      rps  avgserv  minserv  maxserv   timeouts      fails
                         79.0     14.9      0.5     65.9           0          0
               write:      wps  avgserv  minserv  maxserv   timeouts      fails
                          0.0      0.6      0.0      0.0           0          0
               queue:  avgtime  mintime  maxtime  avgwqsz    avgsqsz     sqfull
                        216.5      0.0      1.1M     0.0       11.0         1.5

Does anyone have an idea what could be wrong or what to check further?

thanks a lot
 

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