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Redundant IOC with ATCA(HPI) support

Redundant IOC with ATCA(HPI) support. Utilizing modern hardware for better availability. Artem Kazakov, KEK/SOKENDAI. Why run RIOC on ATCA?. ATCA is modern industry standard for HA applications Supposed to be very reliable (99.999% design availability)

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Redundant IOC with ATCA(HPI) support

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  1. Redundant IOC with ATCA(HPI) support Utilizing modern hardware for better availability Artem Kazakov, KEK/SOKENDAI

  2. Why run RIOC on ATCA? • ATCA is modern industry standard for HA applications • Supposed to be very reliable (99.999% design availability) • ATCA is suggested as a platform for the ILC control system

  3. Advanced Telecom Computing Architecture (AdvancedTCA) • Defined by PCI Industrial Computer Manufacturers Group with 100+ companies participating • Targeted to requirements for the next generation of carrier grade communications equipment • Incorporates the latest trends in high speed interconnect technologies, next generation processors and improved reliability, manageability and serviceability

  4. AdvancedTCA cassis and blades

  5. ATCA Features ATCA provides monitoring and management controls for many parts of the system: fans, network connection, power supplies, bios images, boot ROMs etc… The key role in this process is played by Shelf Manager We want to use this features to make better decisions for fail-over

  6. ATCA Shelf manager Data is exchanged through redundant Intelligent Platform Management Bus IPMB

  7. Redundant IOC • Provides redundancy support for EPICS IOCs • Developed at DESY • Support is already in the BASE since EPICS 3.14.10 release • No need to patch/reconfigure/recompile BASE • Just download RIOC libs and link them to your IOC to make it redundant

  8. CA clients Shared Network Public Public Private Ethernet PV1 PV2 PV3 PV1 PV2 PV3 IOC#1 IOC#2 Hardware What is redundant IOC?

  9. “plain” Redundant IOC on ATCA CA clients Shared Network Public Public ATCA shelf Private Ethernet PV1 PV2 PV3 PV1 PV2 PV3 IOC#1 IOC#2 Hardware

  10. “plain” Redundant IOC on ATCA • Runs “as-is” • But does not know anything about the “smart” hardware of ATCA • Basically is same as running on two normal PCs

  11. Possible benefits of “ATCA”-aware RIOC • Failures can be “predicted” • i.e. temperature starts to rise and the CPU is still working -> we can initiate fail-over procedure before actual hardware fails -> fail-over occurs in more stable and controlled environment • Client connections can be gracefully closed • Allowing the client to reconnect to back-up IOC within 1 second • In case of “real” hardware failure reconnect would occur only after 30 seconds

  12. Redundancy Monitoring Task(RMT) - Key component of RIOC

  13. RMT – Key component of RIOC • Checks “health” of the drivers • Controls drivers (start, stop, sync etc…) • Checks network connectivity • Checks the partner status • Decides when to switch (or not to switch) to the partner

  14. ATCA/HPI driver for RMT IP HPI - Hardware Platform Interface – Generic Platform Independent specification to monitor and control HA systems

  15. “HPI-aware” RIOC on ATCA

  16. Now RMT can monitor any available sensor on ATCA shelf and make better fail-over decisionconfiguration via iocSh: rmtHPIDriverStart "{RACK,0}{ADVANCEDTCA_CHASSIS,0}{PHYSICAL_SLOT,4}{PICMG_FRONT_BLADE,0}" 1rmtHPIDriverStart “entityPath” “Sensor ID”

  17. Free Bonus • The same driver can be used on other hardware other than ATCA • What is really needed is HPI library which can run on top of • IPMI • SNMP – i.e. IBM BladeCenter • Sysfs • …

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