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

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Business continuity, especially across data centers in nearby locations often depends on complicated scripts, manual intervention and numerous checklists. Those error-prone processes are exponentially more difficult when the data storage equipment differs between sites.

Such difficulties force many organizations to settle for partial disaster recovery measures, conceding data loss and hours of downtime during occasional facility outages.

In this webcast and live demo, you’ll learn about:
• Software-defined storage services capable of continuously mirroring data in
real-time between unlike storage devices.
• Non-disruptive failover between stretched cluster requiring zero touch.
• Rapid restoration of normal conditions when the facilities come back up.

Veröffentlicht in: Software
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Zero Downtime, Zero Touch Stretch Clusters from Software-Defined Storage

  1. 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. 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. 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
  4. 4. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. • MRIs • CT-Scans • X-Rays • PACS • EHR (Health Records) • Oracle • Exchange • SQL Server • IBM DB2 • … 4 Applications
  5. 5. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Stretching clusters … what’s different? 5
  6. 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. 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. 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
  9. 9. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 9
  10. 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. 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. 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
  13. 13. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. The illusion of shared disks behind stretched clusters 13
  14. 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. 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. 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. 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. 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. 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. 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. 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
  22. 22. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Demo 22
  23. 23. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 23 Comprehensive Set of Advanced Data Services VIRTUALIZED HOSTS PHYSICAL SERVERS Adaptive Parallel I/O Synchronous Mirroring
  24. 24. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Additional resiliency 24
  25. 25. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 25 Common hot-site for separate centers Data Center Manhattan, New York Secaucus, New Jersey
  26. 26. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 26 • Potential exposure if major failure occurs at alternate site Vulnerable during maintenance? EastWest 26 SQLOracle
  27. 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
  28. 28. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Demo 3-way Resiliency 28
  29. 29. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Taking more costs out 29
  30. 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
  31. 31. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 31 West Move VMs into “storage servers” Synchronous Mirror North 31 Oracle SQL VM VM VM VM East
  32. 32. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 32 West Incredibly shrinking infrastructure Synchronous Mirror North 32 East • Self-paced migration to Hyper-converged systems
  33. 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?
  34. 34. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Questions? The Authority on Software-defined Storage info@datacore.com www.datacore.com

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