Zero Downtime, Zero Touch Stretch Clusters from Software-Defined Storage

1. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. WEBINAR Zero Downtime, Zero Touch Stretch Clusters from Software-Defined Storage Augie Gonzalez Director of Product Marketing DataCore Software

2. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 2 • Business continuity during site major outages • Non-disruptive facility maintenance • Load balancing between sites • Data Center migrations Main Drivers For Campus / Metro Clusters

3. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 3 • 24x7x365 Critical Patient Care • No window for planned downtime • Tiered storage from multiple suppliers • 9+ years without storage-related downtime Maimonides Medical Center Metro-wide synchronous mirroring between diverse storage @Hospital @MIS Facility

6. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 6 • Live VM migration between nodes before maintenance • If one node fails, VM resumes on alternate node • Both nodes must have access to shared storage used to import VM state Simple 2-node cluster VM VM 6 • Oracle state • SQL state SQLOracle

7. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 7 • Redundant servers but data in only one place • Shared storage outage • Physical plant (facility) outage • Loss of Power • HVAC problems • Water damage • Construction impact • … Single points of failure (SPoFs) remain VM VM 7 • Oracle state • SQL state SQLOracle

8. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 8 • Contain impact of facility outages to half of the cluster • Shared disk must be accessible from both sites • Requires replicating data between locations Stretch to separate “fault domains” Oracle SQL VM VM 8 Synchronous copy EastWest

10. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 10 • How latency-sensitive are your apps? • Design guidelines: • Below 5 milliseconds RTT (Round Trip Time) • Up to 60 Miles (100 Kilometers) Keep in mind How far apart? • Utilities • Construction • Floodplains • …

11. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 11 • Synch replication only available between like arrays • Expensive add-on option • Scripting required to make 2nd copy active • Unlike models cannot communicate with each other • Even from same manufacturer • Not supported on many AFAs nor lower cost arrays Challenges replicating SANs Oracle SQL VM VM 11 EastWest

12. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 12 More sensible SDS solution 12 • Make 2nd copy on lower cost drives • Using “SDS nodes” to mirror data • Add your favorite storage devices at either site EastWest Existing arrays Standard server Flash & HDD storage

14. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 14 • Hosts have 2 paths to storage • SAN array presents 2 independent ports to the hosts Path redundancy 14 Preferred Alternate ALUA App

15. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 15 • Hosts have 2 paths to storage • SAN array presents 2 independent ports to the hosts • If one path fails, operating system or hypervisor retries on alternate path Path redundancy 15 Preferred Alternate App

16. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 16 • Data in two places • Appears just like a local disk to the host • Paths routed to different sites Stretched virtual disk 16 Preferred Alternate App EastWest

17. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 17 • Different locations • Separate chassis • Independent power • Independent HVAC • Separate UPS • Diversely routed paths Separate “fault-domains” 17 Preferred Alternate App EastWest

18. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 18 • Updates from one site continuously copied to other site in real-time • Acknowledge completion to host only after updates received at 2nd site Synchronous mirroring 18 Preferred Alternate App EastWest Local copy 2nd copy Synchronous mirroring

19. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 19 • Treated just like a local path failure by the host • Data accessed from alternate site while local copy is unreachable • Changed blocks logged for later resynchronization • No cluster failover required Zero downtime during storage outage 19 Preferred Alternate App EastWest Local copy 2nd copy

20. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 20 • If entire site goes down, “Shared disk” remains accessible despite chaos • Hypervisor restarts VMs at alternate location using standard process Zero-touch failover hides site outage EastWest VM VM 20 SQLOracle

21. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 21 • Automatic resynchronization in background when West side comes up • Only change blocks transmitted to speed up restoration Zero-touch Failback EastWest VM VM 21 SQLOracle Update log

27. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 27 • Maintain HA • Stress-free • Better load distribution • Performance doesn’t suffer 3rd copy for added safeguard West VM VM 27 EastLocal copy 2nd copy Oracle SQL North VM VM 3rd copy

30. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 30 • Non-disruptive migration from arrays to internal storage • In the background • No “host” overhead Replace aging arrays West Synchronous Mirror Oracle North SQL VM VM VM VM 30 East

33. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 33 • Business continuity during site major outages • Non-disruptive facility maintenance • Load balancing between sites • Data Center migrations • ? Stretch clusters- What’s your reason?

Zero Downtime, Zero Touch Stretch Clusters from Software-Defined Storage

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