DRBD SDS. Open Source Software defined Storage for Block IO - Appliances and Cloud Philipp Reisner. Flash Memory Summit 2016 Santa Clara, CA 1

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1 DRBD SDS Open Source Software defined Storage for Block IO - Appliances and Cloud Philipp Reisner Santa Clara, CA 1

2 DRBD s use cases Cloud Ready High Availability Disaster Recovery Storage is one of the most critical components in any cloud environment It has to be easy to provision, highly reliable, cost effective and ideally running on commodity hardware The principal goal of a high availability solution is to minimize or mitigate the impact of downtime The principal goal of disaster recovery is to restore your systems and data to a previous acceptable state in the event of a failure/loss of a data center DRBD can mirror data DRBD9 is in OpenStack, so it integrates DRBD seamlessly replicates asynchronously over long seamlessly with your Private Cloud data transparent to your distances, forming an important building Environment and runs on commodity applications and databases, block of your disaster recovery plan. hardware, other cloud OSs and eliminating single points of Geo-Clustering with automatic Flash virtualization Memory Summit platforms failure within your IT infrastructure Santa Clara, CA fail-over is possible 2

3 In Kernel Data Path Santa Clara, CA 3

4 DRBD 8.x key features Automatic resync after failures Perfomance Linux in kernel (160k IOPs) Multiple volumes per resource Pacemaker integration Synchronous and asynchronous In Linux upstream since (2010) Santa Clara, CA 4

5 New features of DRBD9 Up to 32 nodes per resource Auto promote Transport abstraction (TCP, RDMA, ) DRBD Manage automated control Santa Clara, CA 5

6 Networking Options Transport TCP SCTP RDMA SSOCKS TCP SCTP iwarp RoCE Protocol IP IPoIB Medium SCI Ethernet InfiniBand Hardware Dolphin several suppliers Chelsio etc. Mellanox etc. Santa Clara, CA 6

7 Control Path DRBD Manage Santa Clara, CA 7

8 DRBD Manage Architecture CLI CLI CLI D-Bus DRBD events DAEMON Data I/O DAEMON DAEMON drbdctrl drbdctrl drbdctrl Santa Clara, CA 8

9 Volume Management Example drbdctrl drbdctrl drbdctrl drbdctrl A A E E B B B C C D D D Santa Clara, CA 9

10 Scaling bejond 32 nodes Santa Clara, CA 10

11 DRBD SDS and OpenStack DRBD & drbdmanage dock on here as driver Santa Clara, CA 11

12 DRBD Cinder Driver on cinder node! drbdmanage cinder driver drbdmanage Config file, replication pair/triple/... drbdmanage daemon drbdadm LVM tools CLI call, host-specific drbdsetup dmsetup Linux Kernel - Generic Netlink DRBD Kernel driver device mapper Santa Clara, CA 12

13 OpenStack with SAN Storage network switches Ethernet Neutron servers Nova fibre channel switches SAN storage boxes storage box storage box Cinder Santa Clara, CA 13

14 Replace SAN with DRBD SDS network switches Ethernet Neutron servers Nova more network switches more servers with Internal drives Ethernet Cinder Santa Clara, CA 14

15 Go Hyperconverged! network switches Ethernet Neutron servers Internal drives Nova Cinder Low latency storage access possible by aligning nova and cinder allocations Santa Clara, CA 15

16 IO Performance Example Hardware two IBM L; Power8 2 sockets, 128GB RAM Mellanox Connect X4 dual port; 100GBps InfiniBand HGST Ultrastart SN150 NVMe SSDs, 1.6TB version Software Ubuntu Xenial; on bare metal DRBD & RDMA Transport fio Tests 100% random IO Seperate READ and WRITE Direct access FIO Santa Clara, CA 16

17 WRITE baseline 1 thread Santa Clara, CA 17

18 WRITE baseline 8 threads Santa Clara, CA 18

19 WRITE with DRBD replica Santa Clara, CA 19

20 READ baseline Santa Clara, CA 20

21 READ with DRBD Santa Clara, CA 21

22 READ with DRBD s read-balancing Santa Clara, CA 22

23 OpenStack ROADMAP Q Cinder driver Q Nova driver Q Align Cinder and Nova Benefit: Highly available storage volumes can be created via the Horizon dashboard and the cinder APIs. Snapshots supported. Replica count in cinder configuration visible as "pools" Benefit: Replace iscsi between nova node and cinder nodes with DRBD's native protocol. Improve storage write performance, enable read-balancing, faster and seamless failover. Benefit: In a hyper-converged architecture, get read performance of local storage and lowest possible overhead for write accesses by aligning Cinder and Nova allocations Released "Liberty" October 2015 Released "Mitaka" April 2016 Planning stage Target: Newton October2016 Cinder Nova Cinder Nova Cinder 23

24 DRBD kernel driver ROADMAP Santa Clara, CA 24

25 About LINBIT Best performing High Availability / Block device for Open Stack using common off the shelf hardware 20+ times faster than CEPH and GlusterFS* Only replication technology exceling at both synchronized short distance and asynchronized long distance References Open Source DRBD supported by proprietary addons Hundreds of thousands of DRBD downloads OpenStack comes with DRBD Cinder driver 100% founder owned 25