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
2. 2 Table of Contents • High Availability • DRBD • DRBD kernel module • DRBD managing software • Switching • DRBD SDS
3. Self Introduction
4. 4 Syuta Hashimoto • openSUSE-ja member • openSUSE.Asia Summit 2017 Local Committee Hello!! > Twitter @syuta_openSUSE FB: syutah
5. High Availability
6. 6 Running We need service. We do not need down service. But Sometimes, service is down.
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...
8. 8 The rate of operation DOWN TIME 99% 3d 15h 36m 99.99% 52m 34s 99.999% 5m 16s / year
9. 9 How do you make high availability?
10. 10 Clone Same Hardware, Same OS, Same middleware, Same software But, Is cloning data easy?
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
12. 12 One Solution Realtime storage cloning You can do this if you use DRBD.
13. DRBD
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)
15. 15 DRBD components DRBD manager Disk Manager DRBD kernel module Another Machine
16. DRBD kenel module
17. 17 DRBD KernelModule1 SERVICE Disk Manager DRBD SERVICE Disk Manager DRBD Primary Secondary
18. 18 DRBD KernelModule2 SERVICE Disk Manager DRBD SERVICE Disk Manager DRBD Out Of Service Secondary
19. 19 Primary side detail SERVICE FILE SYSTEVM BUFFER CACHE DRBD DISK SCHED DISK DRIVER RAW DEVICE TCP/IP NIC DRIVER
20. 20 Secondary side detail SERVICE FILE SYSTEVM BUFFER CACHE DRBD DISK SCHED DISK DRIVER RAW DEVICE TCP/IP NIC DRIVER
21. DRBD managing software
22. 22 DRBD with openSUSE openSUSE Leap15 YaST (yast2-drbd) △ Broken... drbdmanage △ Broken... LINSTOR × Not Yet
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
24. Switching
25. 25 Switching •DRDB replicate data. •If it is happen, There is no way to switch.
26. 26 Switching Case1 SERVICE Disk Manager DRBD SERVICE Disk Manager DRBD Primary Secondary Corosynrc/ Pacemaker Corosynrc/ Pacemaker
27. 27 Do Switching SERVICE Disk Manager DRBD SERVICE Disk Manager DRBD Primary Secondary Corosynrc/ Pacemaker Corosynrc/ Pacemaker
28. DRBD SDS
29. 29 DRBD SDS • OpenStack • OpenNebula • Docker • VMware • Kubernetes • LINBIT joins the Open Source OpenSDS Project
30. Questions?
31. Thank you. Join the conversation, contribute & have a lot of fun! www.opensuse.org
32. 32 Have a Lot of Fun, and Join Us At: www.opensuse.org
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