Running a 24 core server (with HT enabled) I tried increasing MaxNoOfExecutionThreads to 24 to perform some benchmarks and got the following error:
2013-02-27 11:21:44 [ndbd] INFO -- Trying to start 12 LQH workers with only 4 log parts, try initial node restart to be able to use more LQH workers.
Here are options from config.ini I find relevant:
It seems that Redo Log file number (not fragment) is always four and they are created in D9-D11 directory on the FS. I haven't been able to find a parameter to change this.
Version running is: 5.5.29-ndb-7.2.10
Any help or experience is welcome.
EDIT - solution: The following option defines the number of Redo log files - NoOfFragmentLogParts
After setting it to 12, you get D8-D19 for Redo Logs and 24 as MaxNoOfExecutionThreads works fine.