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Informix - Problem description

Problem IT31903 Status: Closed

WHEN LRU MIN/MAX VALUES ARE CONFIGURED TO VALUES < 1 ON HDR SECONDARIES
THEY ARE INCORRECTLY INCREASED TO 1

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
t's easy to see this problem issue when comparing onstat -R
output from the primary server to the secondary server.

Example:

primary onstat -R

1016 f       9985     100.0%     9984       9127        857
1017 m                  0.0%        1          0          1
1018 f       9984     100.0%     9983       9113        870
1019 m                  0.0%        1          0          1
1020 f       9984     100.0%     9983       9099        884
1021 m                  0.0%        1          0          1
1022 f       9984     100.0%     9983       9062        921
1023 m                  0.0%        1          0          1
516 dirty, 5111807 queued, 5111808 total, 8388608 hash buckets,
16384 buffer size
start clean at   0.020% (of pair total) dirty, or 2 buffs dirty,
stop at
   0.010%

secondary
1016 f       9984      99.8%     9963       9434        529
1017 m                  0.2%       21         20          1
1018 f       9984      99.8%     9962       9427        535
1019 m                  0.2%       22         21          1
1020 f       9984      99.7%     9951       9380        571
1021 m                  0.3%       33         32          1
1022 f       9984      99.6%     9949       9379        570
1023 m                  0.4%       35         34          1
14318 dirty, 5111808 queued, 5111808 total, 8388608 hash
buckets, 16384 buffer size
start clean at   0.020% (of pair total) dirty, or 2 buffs dirty,
stop at
   0.010%

You can see all the above modified LRU's have > the max dirty
percentage of 0.02% on the secondary.

This extra dirty pages can impact performance of the primary
around checkpoints.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 12.10.xC14 and 14.10.xC4.  *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 12.10.xC14 or 14.10.xC4 (when      *
* available).                                                  *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
19.02.2020
04.03.2020
04.03.2020
Problem solved at the following versions (IBM BugInfos)
12.10.xC14,
14.10.xC4
Problem solved according to the fixlist(s) of the following version(s)
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