DRBD block device replication solution for HA cluster mainly

This is the slide for openSUSE.Asia Summit 2018. This slide describe DRBD and management components. also this slide describe how to switch primary machine.

Transcript

1. DRBD
   block device replication
   solution for HA cluster
   mainly
   - one of the choices for SDS -
   hashimoto syuta
   syuta.hashimoto@gmail.com
   

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2. 2
   Table of Contents
   • High Availability
   • DRBD
   • DRBD kernel module
   • DRBD managing software
   • Switching
   • DRBD SDS
   

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3. Self Introduction
   

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4. 4
   Syuta Hashimoto
   • openSUSE-ja member
   • openSUSE.Asia Summit 2017 Local Committee
   Hello!! >
   Twitter @syuta_openSUSE
   FB: syutah
   

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5. High Availability
   

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6. 6
   Running
   We need service.
   We do not need down service.
   But
   Sometimes, service is down.
   

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7. 7
   Sometimes, It happen
   Memory
   is broken...
   CPU is
   heat up...
   Power Unit
   is broken...
   Disk
   is broken...
   Ethernet Card
   is broken...
   Cable
   is disconnect...
   

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8. 8
   The rate of operation
   DOWN TIME
   99% 3d 15h 36m
   99.99% 52m 34s
   99.999% 5m 16s
   / year
   

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9. 9
   How do you make
   high availability?
   

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10. 10
    Clone
    Same Hardware,
    Same OS,
    Same middleware,
    Same software
    But, Is cloning data easy?
    

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11. 11
    Shared Storage is
    One Idea
    Data is always same.
    But
    ●
    Storage is Single Point Of
    Failure
    ●
    Storage is maybe expensive
    ●
    You need high spec
    connection
    

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12. 12
    One Solution
    Realtime storage cloning
    You can do this if you use DRBD.
    

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13. DRBD
    

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14. 14
    What is DRBD?
    • Distributed Replicated Block Device
    • Developed mainly by LINBIT
    • GNU Public License 2
    • Use Linux kernel
    • Now version is 9 (DRBD9)
    

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15. 15
    DRBD components
    DRBD manager
    Disk Manager
    DRBD kernel module
    Another
    Machine
    

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16. DRBD
    kenel module
    

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17. 17
    DRBD KernelModule1
    SERVICE
    Disk
    Manager
    DRBD
    SERVICE
    Disk
    Manager
    DRBD
    Primary Secondary
    

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18. 18
    DRBD KernelModule2
    SERVICE
    Disk
    Manager
    DRBD
    SERVICE
    Disk
    Manager
    DRBD
    Out Of Service Secondary
    

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19. 19
    Primary side detail
    SERVICE
    FILE SYSTEVM
    BUFFER CACHE
    DRBD
    DISK SCHED
    DISK DRIVER
    RAW DEVICE
    TCP/IP
    NIC DRIVER
    

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20. 20
    Secondary side detail
    SERVICE
    FILE SYSTEVM
    BUFFER CACHE
    DRBD
    DISK SCHED
    DISK DRIVER
    RAW DEVICE
    TCP/IP
    NIC DRIVER
    

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21. DRBD
    managing software
    

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22. 22
    DRBD with openSUSE
    openSUSE Leap15
    YaST
    (yast2-drbd)
    △ Broken...
    drbdmanage
    △ Broken...
    LINSTOR
    × Not Yet
    

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23. 23
    LINSTOR
    DRBD kernel module
    LINSTOR satelite
    LINSTOR Controller
    LINSTOR Client
    LINSTOR Controller
    DRBD kernel module
    LINSTOR satelite
    LINSTOR Client
    Kernel
    Service
    Client
    Machine1 Machine2
    

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24. Switching
    

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25. 25
    Switching
    •DRDB replicate data.
    •If it is happen, There is no
    way to switch.
    

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26. 26
    Switching Case1
    SERVICE
    Disk
    Manager
    DRBD
    SERVICE
    Disk
    Manager
    DRBD
    Primary Secondary
    Corosynrc/
    Pacemaker
    Corosynrc/
    Pacemaker
    

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27. 27
    Do Switching
    SERVICE
    Disk
    Manager
    DRBD
    SERVICE
    Disk
    Manager
    DRBD
    Primary Secondary
    Corosynrc/
    Pacemaker
    Corosynrc/
    Pacemaker
    

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28. DRBD SDS
    

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29. 29
    DRBD SDS
    • OpenStack
    • OpenNebula
    • Docker
    • VMware
    • Kubernetes
    • LINBIT joins the Open Source OpenSDS
    Project
    

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30. Questions?
    

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31. Thank you.
    Join the conversation,
    contribute & have a lot of fun!
    www.opensuse.org
    

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32. 32
    Have a Lot of Fun, and Join Us At:
    www.opensuse.org
    

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    Credits
    Template
    Richard Brown
    rbrown@opensuse.org
    Design & Inspiration
    openSUSE Design Team
    http://opensuse.github.io/branding-
    guidelines/
    

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