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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
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
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
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
Stretching clusters
… what’s different?
5
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
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
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 9
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
• …
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
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
The illusion of shared disks
behind stretched clusters
13
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
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
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
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
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
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
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
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
Demo
22
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
Additional resiliency
24
Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 25
Common hot-site for separate centers
Data Center
Manhattan,
New York
Secaucus,
New Jersey
Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 26
• Potential exposure if major failure
occurs at alternate site
Vulnerable during maintenance?
EastWest
26
SQLOracle
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
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
Demo
3-way Resiliency
28
Copyright © 2018 DataCore Software Corp. – All Rights Reserved.
Taking more costs out
29
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
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
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
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?
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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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
  • 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. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Stretching clusters … what’s different? 5
  • 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
  • 9. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. 9
  • 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
  • 13. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. The illusion of shared disks behind stretched clusters 13
  • 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
  • 22. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Demo 22
  • 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. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Additional resiliency 24
  • 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. 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. 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. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Demo 3-way Resiliency 28
  • 29. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Taking more costs out 29
  • 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. 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. 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. 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. Copyright © 2018 DataCore Software Corp. – All Rights Reserved. Questions? The Authority on Software-defined Storage info@datacore.com www.datacore.com