You may want to check
1) ISAM appliance hardening webinar and PDF:
https://www.ibm.com/support/pages/node/5695797
https://www.ibm.com/support/pages/webinar-replay-security-access-manager-appliance-hardening-31-march-2020
https://www.ibm.com/support/pages/system/files/inline-files/ISAM_Appliance_Hardening_2020-03-31_updated.pdf
2) ISAM performance tuning guide:
https://www.ibm.com/support/pages/ibm-security-access-manager-90-performance-tuning-guide
3) ISAM tuning XLS for reference:
https://github.com/IBM-Security/isam-support/tree/master/tuning
4) Articles:
https://philipnye.com/2016/05/24/commonly-overlooked-isam-settings-for-production-deployments/
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