APAR status
Closed as program error.
Error description
An RSS having to receive logical logs from log restore rather than from primary might perform poorly due to missing read-ahead. Reason is an RSS read-ahead optimization moving the read-ahead from bld_logrecs thread to RSS_Recv thread which, during log restore, is in wait state, so would not see any log records and not submit any read-ahead requests. You can verify non-existing read-ahead be 'onstat -g rah' returning empty read-ahead statistics.
Local fix
Workaround, for the duration of the log restore: onmode -wf CDR_FEATURES NORAOPT After log restore completed, when logs are being received from primary, re-enable the optimization using onmode -wf CDR_FEATURES RAOPT
Problem summary
**************************************************************** * USERS AFFECTED: * * Users of Informix Server prior to 14.10.xC8. * **************************************************************** * PROBLEM DESCRIPTION: * * See Error Description * **************************************************************** * RECOMMENDATION: * * Upgrade to Informix Server 14.10.xC8. * ****************************************************************
Problem conclusion
Fixed in Informix Server 14.10.xC8.
Temporary fix
Comments
APAR Information
APAR number
IT40074
Reported component name
INFORMIX SERVER
Reported component ID
5725A3900
Reported release
E10
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2022-02-25
Closed date
2022-04-08
Last modified date
2022-04-08
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
INFORMIX SERVER
Fixed component ID
5725A3900
Applicable component levels
[{"Line of Business":{"code":"LOB10","label":"Data and AI"},"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSGU8G","label":"Informix Servers"},"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"E10"}]
Document Information
Modified date:
09 April 2022