This is a presentation that is submitted and presented in OpenStack Summit Atlanta 2014

1. © 2014 Persistent Systems Ltd
www.persistentsys.com
Enabling DraaS on OpenStack
Speakers: Haribabu Kasturi, Amitabh Shukla

2. © 2014 Persistent Systems Ltd
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Why Disaster Recovery?

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Why DraaS on OpenStack?
Bring new
customers to
Cloud
Co-located
DR
Infrastructure
Flexible
Options for
RTO & RPO
Business
Continuity for
OpenStack
loads
 New customers from SME
customers
 Various businesses require
affordable & simple solution to a
near real time CDP solution
 Different RTO and options allow
same stack to serve various
customers with different
solutions
 A DR option on homogenous
environments enables workloads
to use services from platforms
effectively
 Simpler Implementation of
failback
 Co-located DR infrastructure
enables highest level of RTO &
RPO
 Less number of failures and low
latency to data backup

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Agenda
Evaluation
of Sources
for DraaS
Various
DraaS
architecture
Evaluation
of Current
OpenStack
and features
Next Steps
towards
DraaS on
OpenStack

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Sources for DR
Physical
Machines
Virtual Machines
Private Cloud
DRaas

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Basic Steps involved in DR
Source
• Convert P2V ?
• Live Snapshotting?
Data capture
and Transfer
• Capture Delta differences
• Sync data with DR Cloud
• Ensure confirmed State
Incident
Detection
• Manual incident detection
• Automated incident detection algorithms
Provision
• Challenges in provisioning
• The RTO Challenge

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A little re-introduction of terms
 RPO : Recovery Point Objective is the age of files that must be recovered from
backup storage for normal operations to resume after failure
 Ex: if the RPO is one hour, backups must be made at least once per hour.
 RTO : Recovery Time Objective is the duration of time within which a
Machine must be restored after a disaster (or disruption)
 Ex: if RTO is 10 minutes then the service must be recovered with in 10 minutes of
reporting failure.
 Delta Backups: Delta backups are the differences between the last Recovery
Point and now. These can be disk, configuration or meta data information

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DraaS on OpenStack alternative #1
Cinder
DraaS
Service
Virtual Machines
DraaS Agent
Cinder- Volumes
1
2
3
RPO > 30 Min
RTO < 10 Min
5
4
Dash Board 6
DR-VM

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Steps involved
1. DraaS Agent Requests Back UP
2. DraaS Service assigns the Data VM that stores the delta snapshot
3. Data VM is writes deltas to the cinder volume such that exact replica of
source disk is maintained
4. User/ Backup program initiates backup
5. DraaS Service requests Compute cluster to boot from cinder
6. DR VM comes up and accessible

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DraaS on OpenStack alternative #2
Virtual Machines
DraaS Agent
RPO > 12 hrs
RTO < 1 Hr
Snapshot4
Snapshot3
Snapshot2
Snapshot1
Swift
Snapshot4
Snapshot3
Snapshot2
Snapshot1
DraaS
Service
Dash Board
Glance
Merged
Image
Compute
DR-VM
1
2
43
6
5

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Steps Involved
1. DraaS Agent pushes Snapshots periodically to DraaS service
2. DraaS Service pushes objects to swift
3. User/ Backup program initiates backup
4. DraaS service requests compute to boot machine
5. DraaS Service merges snapshots and uploads to glance
6. DR VM comes up and accessible

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 Huge Data movement between Crystals
 RTO and RPO requirements
 “No change” syndrome for already existing Cloud
 Application Quiescing involves in Synchronous backing of various VM’s on
timeline
 Small implementation issues
Challenges

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 Define incubated project for DRaaS for OpenStack
 Enhance Disk Replication Service in OpenStack for DRaaS support
 Define and develop Agents for various types of end points as OpenStack
Projects
Next Steps

14. © 2014 Persistent Systems Ltd
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© 2014 Persistent Systems Ltd
Thank you all on behalf of Persistent.
Feedback / Questions:
haribabu_kasturi@persistent.co.in
vijesh_rangaswami@persistent.co.in
shriram_natarajan@persistent.co.in