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Among the largest pain points for most businesses are data storage and backup. Learn about the value and best practices of deploying Citrix CloudBridge to help optimize NetApp SnapMirror storage replication.
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CloudBridge and Storage Solutions
The killer app
Gopinath Durairaj
Director, Product Management, Citrix Cloud Networking Group
Cedric Courteix
Technical Alliance Manager, NetApp Global Alliances
Citrix + NetApp joint solutions
© 2013 Citrix | Confidential – Do Not Distribute
Data Center
Data Center (Backup)
Storage Replication
• Synchronous Replication limited by latency
• Asynchronous Replication Periodic updates
• NetApp SnapMirror
• Uses multiple connections
• Up to two per volume
• Full volume or incremental replicates
• Typical Replication Options
• Nightly – finish within the assigned window
• Continuous – co-exist with critical flows
Storage
© 2013 Citrix | Confidential – Do Not Distribute
Replication Performance over WAN
Latency • TCP sender transmits data upto the
window size and waits for Ack
• Round-trip time impacts utilization even
if bandwidth is plenty
Packet Loss • TCP dramatically reduces the window
size when packets get lost
• Slow ramp up back to the original
window size
Standard TCP Behavior
© 2013 Citrix | Confidential – Do Not Distribute
CloudBridge Optimization Technologies
TCP Flow
Control Compression
Protocol
Accelerators QoS
AutoOptimizer™ Engine
Application
Mix
Network
Conditions
Improve
inefficient
protocols
Data
compression /
De-duplication
Overcome
loss/latency
penalties
Prioritize
critical
traffic
© 2013 Citrix | Confidential – Do Not Distribute
TCP Flow Control
Slow Start Slow Ramp
Without CloudBridge
Average
Utilization
Throughput
Time
With CloudBridge
Average
Utilization
Throughput
Time
Link Speed
Tight RPO Less data loss with failures
Adjusts for both latency and packet loss
© 2013 Citrix | Confidential – Do Not Distribute
QoS
NetApp SnapMirror
Bulk Transfers
WAN Application Traffic
Without CloudBridge
60%
20%
20%
Bulk Transfers
Application Traffic NetApp SnapMirror
With Cloudbridge
Application level granularity
Deep classification, prioritization and shaping
Run SnapMirror in shared links
© 2013 Citrix | Confidential – Do Not Distribute
CloudBridge with SnapMirror
Issue SnapMirror SnapMirror + CloudBridge
Low WAN utilization – due to latency, packet loss
Increase window size to address latency
Optimized window size + congestion behavior to increase WAN utilization
Limited WAN throughput Native compression Offload compression to CloudBridge increased file serving capacity
Shared link with other critical traffic
N/A Preferential treatment for high priority traffic and bandwidth allocation. Enable link sharing, running SnapMirror in background
Test Results
© 2013 Citrix | Confidential – Do Not Distribute
NetApp SnapMirror Testing
NetApp SnapMirror Async
CloudBridge 5000 CloudBridge 5000
NetApp Storage NetApp Storage
Database Server Database Server
DC1 DC2
FAS 3270 FAS 3270
© 2013 Citrix | Confidential – Do Not Distribute
SnapMirror Replication times
Greater benefits under high latency or lossy WAN conditions
Using 50ms RTT WAN latency and 0.01% loss
Results depend on WAN condition and data compressibility
119
578
52 59
0
100
200
300
400
500
600
700
0% Loss 0.01% Loss
Re
plic
atio
n t
ime
, Se
con
ds
Baseline Optimized
1180
376
95 37
0
200
400
600
800
1000
1200
1400
No de-dup De-dup
Re
plic
atio
n t
ime
, Se
con
ds
Baseline Optimized
© 2013 Citrix | Confidential – Do Not Distribute
References
Citrix Sales Knowledge Base Joint Citrix and NetApp White paper http://www.citrix.com/skb/articles/RDY9621 Deployment Guide http://www.citrix.com/skb/articles/RDY9506
NetApp Technical Report SnapMirror Async Overview and Best Practices Guide www.netapp.com/us/library/technical-reports/tr-3446.html
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