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Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
Cisco NetApp VMware - Long Distance VMotion
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Cisco NetApp VMware - Long Distance VMotion

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Cisco NetApp VMware VMotion - Joint Solution presentation from Networkers Live (Barcelona, 2010)

Cisco NetApp VMware VMotion - Joint Solution presentation from Networkers Live (Barcelona, 2010)

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  • Transcript

    • 1. Application Mobility Across Data Centers BRKGENPNL-2104 Joel T. McKelvey - Technical Alliance Manager, NetApp Ravi Neelakant - Technical Alliance Manager, VMware Thomas Scheibe - Director, DC Systems Marketing, Cisco
    • 2. Agenda <ul><li>Application Mobility For Business Continuance </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 3. Aspects of Business Continuance <ul><li>Business Continuance Plan </li></ul><ul><ul><li>Procedures and processes needed to successfully keep business applications operational while meeting agreed upon service levels </li></ul></ul><ul><li>Personnel and space considerations </li></ul><ul><ul><li>Staffing and facilities needed at both points of application workload (both data centers) </li></ul></ul><ul><li>Data Center Infrastructure for Business Continuance </li></ul><ul><ul><li>Virtual/Physical server </li></ul></ul><ul><ul><li>Network Connectivity </li></ul></ul><ul><ul><li>Storage capabilities </li></ul></ul>
    • 4. Application Mobility for Business Continuance <ul><li>Workload balancing across data centers and clouds </li></ul><ul><li>Disaster avoidance </li></ul><ul><li>Proactive response to disruptions – mitigates risks of: </li></ul><ul><ul><ul><li>Approaching disasters, viz. hurricanes, floods, etc. </li></ul></ul></ul><ul><ul><ul><li>Power grid maintenance </li></ul></ul></ul><ul><ul><ul><li>Data center maintenance and migrations </li></ul></ul></ul><ul><li>Planned events scheduled over a period of time </li></ul><ul><li>Achieved with </li></ul><ul><ul><li>Cisco Data Center Interconnect (DCI) Solution </li></ul></ul><ul><ul><li>NetApp’s FlexCache-enabled Intelligent Storage Arrays </li></ul></ul><ul><ul><li>VMware vSphere & VMotion Technologies </li></ul></ul>
    • 5. What is VMware's VMotion? VMotion TM is a feature of VMware’s ESX servers where a Virtual Machine can be migrated from one ESX Server to another one with no application downtime
    • 6. Business Continuance with VMotion VMware vCenter Data Center 1 Data Center 2 Data Center Interconnect vSphere Nexus 1000V vSphere Nexus 1000V
    • 7. Long Distance VMotion <ul><li>Defined as a VMotion (movement of VM between hosts) over long distance </li></ul><ul><li>Requires specialized infrastructure/environment </li></ul><ul><li>Can be used to provide Application Mobility for Business Continuance </li></ul>
    • 8. Disaster Recovery <ul><li>After the fact reactive response to disasters </li></ul><ul><ul><li>Earthquakes, flood </li></ul></ul><ul><ul><li>Power grid failures </li></ul></ul><ul><ul><li>Catastrophic hardware failures </li></ul></ul><ul><li>Adhere to Recovery Time and Point objectives </li></ul><ul><li>Achieved with </li></ul><ul><li>VMware SRM Technology </li></ul><ul><li>NetApp’s SnapMirror </li></ul><ul><li>Cisco’s DCI Network </li></ul>
    • 9. Disaster Recovery with VMware Site Recovery Manager (SRM) Protected Site Recovery Site VirtualCenter Site Recovery Manager VirtualCenter Site Recovery Manager Datastore Groups Datastore Groups Intelligent, Efficient Array Replication
    • 10. Disaster Recovery with VMware Site Recovery Manager (SRM) Protected Site Recovery Site VirtualCenter Site Recovery Manager VirtualCenter Site Recovery Manager Datastore Groups Datastore Groups Intelligent, Efficient Array Replication
    • 11. Disaster Recovery with VMware Site Recovery Manager (SRM) Protected Site Recovery Site VirtualCenter Site Recovery Manager VirtualCenter Site Recovery Manager Datastore Groups Datastore Groups Intelligent, Efficient Array Replication
    • 12. Disaster Recovery with VMware Site Recovery Manager (SRM) Protected Site Recovery Site VirtualCenter Site Recovery Manager VirtualCenter Site Recovery Manager Datastore Groups Datastore Groups X Intelligent, Efficient Array Replication
    • 13. Agenda <ul><li>Application Mobility for Business Continuance Overview </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 14. General Requirements VMotion L2 Domain Elasticity Cisco Catalyst 6500 Series Cisco Nexus 7000 Series Cisco Nexus 7000 Series Storage Attributes and Elasticity IP Routing and IP Service Considerations <ul><li>Networking </li></ul><ul><ul><li>IP Routing & Services </li></ul></ul><ul><ul><li>LAN Extension </li></ul></ul><ul><li>Storage </li></ul><ul><ul><li>Availability across data centers </li></ul></ul>
    • 15. VMware, Cisco, NetApp Joint Validation <ul><li>Use Networking (LAN/SAN) technology to simulate a “single DC” environment across data centers so that existing VMotion will continue to work independent of location of source and destination ESX servers </li></ul><ul><li>No changes needed to vSphere 4.0 environment </li></ul><ul><li>Provide guidance for extending VMotion across data centers including distance and bandwidth requirements </li></ul><ul><li>Consider various storage options - from generic to best-of-breed. Focus on mitigation of performance issues between data centers </li></ul>
    • 16. Agenda <ul><li>Application Mobility for Business Continuance Overview </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 17. VMware VMotion Requirements Network Requirements Storage Requirements ≥ 622 Mbps of bandwidth and ≤ 5 msec latency between ESX Servers The virtual disks of all the VMs are on VMFS/NFS data stores VMs have access to the same IP subnet and broadcast domain on source and destination ESX Servers The VMFS/NFS data store read/write for source and destination
    • 18. Network Requirements <ul><li>Extend L2 domain across datacenters – Flat network with single subnet with single broadcast domain, having the following attributes </li></ul><ul><ul><li>High Availability – No single point of failure </li></ul></ul><ul><ul><li>Load Balancing – Fully utilizing WAN bandwidth between data centers </li></ul></ul><ul><ul><li>Spanning Tree Isolation, Network Loop Prevention and Broadcast Storm Avoidance across data centers </li></ul></ul><ul><ul><li>Scalability – Ability to move multiple applications and virtual machines </li></ul></ul><ul><li>Routing Optimization for VMotion’ed applications – Routing optimizations to reach IP prefixes that have moved </li></ul><ul><li>Visibility and Granularity at VM Level – Provide end-to-end consistency from a QoS, security, provisioning and traffic visibility perspective </li></ul><ul><li>Optional Services </li></ul><ul><ul><li>Encryption – link or packet encryption due to compliance reasons </li></ul></ul><ul><ul><li>Hierarchical QoS – for WAN links or for end-end QoS </li></ul></ul>
    • 19. Network - Cisco’s LAN Extensions Options <ul><li>Any location / any transport / on demand </li></ul><ul><ul><li>Dark Fiber/DWDM </li></ul></ul><ul><ul><ul><li>Catalyst 6500 VSS </li></ul></ul></ul><ul><ul><ul><li>Nexus 7000 vPC </li></ul></ul></ul><ul><ul><ul><li>ONS Crossponder </li></ul></ul></ul><ul><ul><ul><li>OTV with Nexus 7000 </li></ul></ul></ul><ul><ul><li>MPLS </li></ul></ul><ul><ul><ul><li>EoMPLS and VPLS (Catalyst 6500/ASR 1000) </li></ul></ul></ul><ul><ul><ul><li>OTV with Nexus 7000 </li></ul></ul></ul><ul><ul><li>IP </li></ul></ul><ul><ul><ul><li>Any Transport over GRE (Catalyst 6500/ASR 1000) </li></ul></ul></ul><ul><ul><ul><li>OTV with Nexus 7000 </li></ul></ul></ul>L2 L3 IP DC-1 DC-2 Elastic LAN Extensions
    • 20. Network – LAN Extension with OTV <ul><ul><li>Built-in loop prevention (no STP) </li></ul></ul><ul><ul><li>Failure boundary is preserved </li></ul></ul><ul><ul><li>Floods/broadcasts can be suppressed </li></ul></ul><ul><ul><li>Seamless adds/removes & multi-homing </li></ul></ul><ul><ul><li>Full cross-sectional BW </li></ul></ul><ul><ul><ul><li>Equal Cost Multi-Pathing </li></ul></ul></ul><ul><ul><ul><li>All-active Multi-homing </li></ul></ul></ul><ul><ul><li>Multi-point connectivity </li></ul></ul><ul><ul><li>Minimal State </li></ul></ul><ul><ul><ul><li>No PW state preserved </li></ul></ul></ul><ul><ul><li>Optimal m-cast replication </li></ul></ul><ul><ul><li>Point-to-cloud model for improved manageability </li></ul></ul><ul><li>IP based Ethernet (L2) VPN solution </li></ul><ul><li>MAC routing = control plane MAC learning + packet switching </li></ul><ul><li>Core and Site Transparency </li></ul><ul><li>Available on Nexus 7000 in 1HCY10 </li></ul>L2 L3
    • 21. Network - Routing Optimization for Application Mobility <ul><li>VMotion moves VM between data centers while retaining the same IP and MAC address </li></ul><ul><li>Ingress traffic should be routed to new VM location </li></ul><ul><li>Egress traffic must be symmetrical to maintain stateful services (firewall) </li></ul>Options Ingress Traffic Egress Traffic DNS <ul><li>DNS based solution using GSS/ACE </li></ul><ul><li>HSRP Localization/Filtering </li></ul><ul><li>ACE L3-One Arm mode, source-NAT </li></ul>Routing <ul><li>Detect VM and announce a route </li></ul><ul><li>HSRP Localization/Filtering </li></ul>
    • 22. Network - Routing Optimization with GSS/ACE WAN Data Center 1 Data Center 2 Virtual Machine sql-server.jsmp.cisco.com Access Agg Access Agg Cisco GSS Cluster ACE1 ACE2 Virtual Machine sql-server.jsmp.cisco.com Workflow Integration between vCenter & GSS/ACE notifies GSS/ACE of VM move ESX ESX HSRP Active HSRP Standby HSRP Active HSRP Standby GSS DNS Lookup sql-server.jsmp.cisco.com => ACE 1 IP Address => ACE 2 IP Address GSS DNS Lookup sql-server.jsmp.cisco.com => ACE 2 IP Address => ACE 1 IP Address VMware vCenter
    • 23. Distributed Virtual Switch – Cisco Nexus 1000V Nexus 1000V VSM vCenter <ul><li>Cisco Nexus 1000V </li></ul><ul><li>Provides existing switching features (QoS, Multicast, ERSPAN, PVLAN) </li></ul><ul><li>Provides VM level visibility for provisioning, security, traffic visibility and management </li></ul><ul><li>Consistent services </li></ul><ul><li>Coordinated, coherent management </li></ul>vSphere vSphere vSphere Nexus 1000V VM VM VM VM VM VM VM VM VM VM VM VM
    • 24. Storage Requirements <ul><li>Core Requirements </li></ul><ul><ul><li>Both vSphere hosts need R/W access to same data set </li></ul></ul><ul><ul><li>Must maintain data performance at source and destination </li></ul></ul><ul><ul><li>Must maintain data availability at the source and destination </li></ul></ul><ul><ul><li>Must be VM granular to correspond to Cisco VM granular network </li></ul></ul><ul><ul><li>Must be transparent to VMware layer (VM) </li></ul></ul><ul><ul><ul><li>Failover must always be within timeout windows </li></ul></ul></ul><ul><ul><li>Must handle broad range of split-brain conditions </li></ul></ul><ul><ul><li>Must handle sustained loss and resumption of connectivity </li></ul></ul><ul><li>Additional Services: </li></ul><ul><ul><li>Support the destination location at all times </li></ul></ul><ul><ul><li>Disaster Recovery </li></ul></ul><ul><ul><li>High efficiency despite multiple locations </li></ul></ul>
    • 25. Storage Architecture Options
    • 26. Option 1a – Shared Storage <ul><li>FibreChannel </li></ul><ul><li>FCIP </li></ul><ul><li>iSCSI </li></ul><ul><li>NFS (NAS) </li></ul>Cisco MDS 9513 ESX ESX ESX ESX Cisco MDS 9134 Stretched Network <200KM
    • 27. Option 1b – Storage VMotion & VMotion Cisco MDS 9513 Stretched Network <200KM ESX ESX ESX ESX ESX ESX ESX ESX Cisco MDS 9134 Stretched Network <200KM <ul><li>FibreChannel </li></ul><ul><li>FCIP </li></ul><ul><li>iSCSI </li></ul><ul><li>NFS (NAS) </li></ul>
    • 28. Option 2 – Intelligent Data Management VMFS-Site A NFS-Site A VMFS-Site B NFS – Site B Stretched Network <200KM Stretched Network <200KM DCI & NFS ESX ESX ESX ESX ESX ESX ESX ESX
    • 29. Option 3 – Stretched or Clustered VMFS-Active-Active Stretched Network <200KM Single Logical Array ESX ESX ESX ESX ESX ESX ESX ESX
    • 30. Storage Architecture Comparison Storage Architectures Shared Storage VMotion Storage VMotion and VMotion Intelligent Data Management for LDVM Stretched or Clustered Storage for LDVM Description Single array visible to both sites using extended SAN or other extended storage network. Storage VMotion to move storage between datastores at different sites. VMotion immediately follows. At each site arrays present identical storage to hosts. Single canonical copy of data at origin. Data cached on non-origin arrays. VM granular. Arrays appear as single logical entity. Data moves and copies coordinated via management plane. Currently not VM granular. Performance over Distance Long distances result in high latency and poor performance. Works over long distances with performance issues during transfer. Supports extremely long distances Very Short (current implementations under 10KM) Storage Requirements Low. Single array. FC, iSCSI, NFS. No specialized storage required. Moderate. Multiple arrays. Storage systems must be present at all sites. Moderate. Multiple arrays. Storage systems must be present at all sites. Caching configured at all sites (zero size until filled). High. Storage systems must be present at all sites. Clustering may add complexity. Coherency and split-brain concerns. Granularity and full migration issues.
    • 31. Agenda <ul><li>Application Mobility for Business Continuance Overview </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 32. VMotion with Intelligent Data Management Core Data Center 1 OTV VDC SQL Server SQL Server Cisco GSS Cluster Cisco ACE/WAAS Cisco 4900-M Cisco Nexus 5k Cisco 6500 with VSS Cisco Nexus 7K Cisco Nexus N7k Cisco ACE/WAAS Access Aggregation OTV VDC OTV VDC OTV VDC Cisco Nexus 5k Data Center 2 SQL Server WAN SQL Client ~ 200 kms Cisco 6500 with VSS Cisco 6500 with VSS ESX ESX NetApp Storage Volume & FlexCache NetApp Storage Volume & FlexCache VMware vCenter ESX
    • 33. Joint Validation Test Server and Applications Application Server Configuration Stress Generation Tool Application Performance Metrics Microsoft SQL Server 2005 (64-bit) on vSphere 4.0 CPU : 4 virtual CPUs (vCPUs) Memory : 8 GB Storage : Approximately 300 GB ( NetApp FAS3100 ) OS : Microsoft 2008 64-bit server Dell DVD Store open source benchmark Orders per minute (OPM)
    • 34. VM Migration Time Across Data Centers Application: Microsoft SQL with more than 11,800 orders per minute
    • 35. VM Application Performance Less than 3% application performance degradation
    • 36. Summary of Joint Validation <ul><li>VMotion up to 200 km distance </li></ul><ul><li>Validated Solution Components </li></ul><ul><ul><ul><li>VMware vSphere 4 </li></ul></ul></ul><ul><ul><ul><li>Cisco Nexus 1000 Distributed Virtual Switch </li></ul></ul></ul><ul><ul><ul><li>Cisco LAN Extension solution with OTV and Nexus 7000 </li></ul></ul></ul><ul><ul><ul><li>Cisco ACE/GSS for Routing Optimization and IP Services </li></ul></ul></ul><ul><ul><ul><li>NetApp Active-Cached FlexCache Storage </li></ul></ul></ul>
    • 37. Agenda <ul><li>Application Mobility for Business Continuance Overview </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 38. VMware Long Distance VMotion Feature Compatibility Feature Description VMotion across datacenters Officially Supported as of Sept 2009 <ul><ul><ul><li>ESX Server Support </li></ul></ul></ul>vSphere 4 or later <ul><ul><ul><li>Virtual Center </li></ul></ul></ul>Single Virtual Center Across DCs <ul><ul><ul><li>Spanned VMware Clusters </li></ul></ul></ul>Not Supported (use separate on each side) Distance between DC <200 km (5 ms RTT latency) Min Bandwidth between ESX OC12 (622 Mbps) LAN extension Cisco DCI technologies (eg. Catalyst 6500 VSS, Nexus 7000 vPC, OTV on Nexus 7000) <ul><ul><ul><li>IP Addressing on VM </li></ul></ul></ul><ul><ul><ul><li>IP address needs to remain the same across DC (use LAN extension) </li></ul></ul></ul>Storage extension Stretched SAN/ NFS (eg. WDM /FCIP Cisco technology optionally with Cisco IO Acceleration) <ul><ul><ul><li>Storage </li></ul></ul></ul>FlexCache and related technologies fully supported and available today
    • 39. Best Practice Recommendations <ul><li>Always have ESX clusters at each site, not spanning sites </li></ul><ul><li>Configure a single vCenter managing both sites </li></ul><ul><li>Configure HA/DRS clusters on each site – avoid “across sites” </li></ul><ul><li>Configure one (or more) vDS across sites </li></ul><ul><li>Ensure local storage availability before embarking on stretched use cases </li></ul><ul><li>Planned VMotion between sites </li></ul><ul><ul><li>If using Option 1b: do Storage VMotion first, compute VMotion next </li></ul></ul><ul><ul><li>Network routing and polices needs to be synchronized or adjusted accordingly </li></ul></ul>
    • 40. Agenda <ul><li>Application Mobility for Business Continuance Overview </li></ul><ul><ul><li>Disaster Avoidance (Planned) </li></ul></ul><ul><ul><li>Disaster Recovery (Unplanned) </li></ul></ul><ul><li>VMware, Cisco, NetApp Joint Validation Overview </li></ul><ul><li>Infrastructure Requirements </li></ul><ul><li>Joint Validation Results </li></ul><ul><li>Feature Compatibility </li></ul><ul><li>Future Directions </li></ul><ul><li>Q&A </li></ul>
    • 41. Long Distance VMotion Future Directions <ul><li>Feature Integration </li></ul><ul><ul><li>Make VMware DRS and VMware HA aware of WAN link and “sidedness” </li></ul></ul><ul><ul><li>Integrated pre-flight checks </li></ul></ul><ul><li>Enhanced Network Support </li></ul><ul><ul><li>Elastic LAN extensions with WAN acceleration and support disparate IP networks across very long distances </li></ul></ul><ul><li>Enhanced Storage Support </li></ul><ul><ul><li>Active/Active storage – with “access anywhere” </li></ul></ul><ul><ul><li>Validating stretched single array configurations </li></ul></ul><ul><li>Longer Distances </li></ul><ul><ul><li>Support > 200km </li></ul></ul>
    • 42. Application Mobility - Today VMware vCenter Data Center 1 Data Center 2 Data Center Interconnect vSphere Nexus 1000V vSphere Nexus 1000V
    • 43. Application Mobility - Future Customer Data Center 1 Customer Data Center 2
    • 44. For More Information <ul><li>VMware Networking Blog: http://blogs.vmware.com/networking </li></ul><ul><li>Virtual Geek Blog: http://virtualgeek.typepad.com </li></ul><ul><li>VMware VMotion: http://www.vmware.com/products/vi/vc/vmotion.html </li></ul><ul><li>Data Center Interconnect (DCI): http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps708/white_paper_c11_493718.html </li></ul><ul><li>Cisco Nexus 7000 Series Switches: http://www.cisco.com/go/nexus7000 </li></ul><ul><li>Cisco Nexus 1000V Series Switches: http://www.cisco.com/en/US/products/ps9902/index.html </li></ul><ul><li>Cisco ACE, GSS Products: </li></ul><ul><ul><li>http://www.cisco.com/en/US/products/hw/contnetw/ps4162/index.html </li></ul></ul><ul><ul><li>http://www.cisco.com/en/US/products/ps8361/index.html </li></ul></ul><ul><ul><li>http://www.cisco.com/en/US/products/ps6906/index.html </li></ul></ul><ul><li>NetApp FlexCache Technology </li></ul><ul><ul><li>http://www.netapp.com/us/products/platform-os/flexcache/ </li></ul></ul><ul><li>FlexCache Architecture Technical Report </li></ul><ul><ul><li>http://media.netapp.com/documents/tr-3669.pdf </li></ul></ul><ul><li>NetApp Virtualization Blogs </li></ul><ul><ul><li>http://blogs.netapp.com/virtualstorageguy/ -- Virtual Storage </li></ul></ul><ul><ul><li>http://blogs.netapp.com/virtualization/ -- Virtualization Effect </li></ul></ul>
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