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Created by: Philip Williams
Modified Date: July 2015
OpenStack Day India 2015
Storage Infrastructure
Choices for
OpenStack Clouds
www.rackspace.com
Considerations
2
www.rackspace.com
Requirements
3
• Durability
– How much failure can I experience before data loss?
• Availability
– How much failure can I experience before data unavailable?
– For how long?
• Scalability
– Capacity Today? Tomorrow? Next Year?
– Hot/Cold Ratios
•Performance
– Realistic expectations apply!
www.rackspace.com
What exactly are you storing?
4
• Purpose and Value
– Mission Critical, cannot run the business?
– Second Class Services, just inconvenient?
– Dog Pictures?
– Computationally expensive to reproduce?
– Already Compressed or Encrypted?
•Access Patterns
– Random, Highly Transactional?
– Sequential, Streaming?
– Mostly Reads?
– Mostly Writes?
•Does your data age?
– How much of your dataset is “hot” or “cold”?
www.rackspace.com
ONE SIZE DOES NOT FIT ALL
5
www.rackspace.com
Storage Sub-Systems
6
www.rackspace.com
Scale-Out Object Storage
7
• Objects replicated between nodes
• Proxy Layer for load-balancing
• Proven at scale, easy to grow
• Can’t mount file systems or block volumes
• What if my application doesn’t “speak” Object?
• Eventual Consistency
www.rackspace.com
LVM / iSCSI
8
• Server(s) with local disks carved up by LVM
– Disk redundancy built in using RAID or Volume Mirroring
• Block Vols presented over Ethernet (iSCSI)
• No node failure protection
– Server fails, volumes fail
• Least Redundancy
• Potential for Hot Spots
• Lowest Cost*
• Easy to Scale
www.rackspace.com
Dual Controller Storage Arrays
9
• Typically Termed “Mid-Range” ~50-1000 Disks
• Block Vols presented via iSCSI and FC Protocols
• Controller and Disk Redundancy
• Support for aggregated Disk Pools
• Support for auto-tiering of data
• Snapshot/Clone Capabilities
• Typically 5 9’s Availability
• Limited Scalability
• Good Performance*
www.rackspace.com
Multi-Controller Storage Arrays
10
• Typically Termed “High End” ~200 to 3000 Disks
• Block Vols presented via iSCSI and FC Protocols
• Meshed Controller Subsystems
• Support for large aggregated disk pools
• Support for auto-tiering of data
• Snapshot/Clone Capabilities
• Redundant Everything
– 6 9’s and greater availability
• Better Scalability
• Higher Performance*
www.rackspace.com
All Flash Arrays
11
• Block Vols presented via iSCSI and FC Protocols
• Controller and Disk Redundancy
• Inline Dedupe and Compression
• Meshed Controller Subsystems
• Snapshot/Clone Capabilities
• Typically 5 9’s Availability
• Lower Scalability
• Highest Performance*
www.rackspace.com
Scale-Out / Server SAN
12
• Block Vols presented via iSCSI and Proprietary Protocols
• Typically Commodity Hardware
– x86, 10GbE (sometimes InfiniBand)
• Many nodes, 10’s to 100’s
• Redundancy achieved by spreading data across nodes
– Sub-Object Replication
– Erasure Coding
• Greatest Scaling
• Good Performance*
www.rackspace.com
Storage Networking
13
www.rackspace.com
Storage Networking
14
• How do I reach my persistently stored data?
– Ethernet?
– Fibre Channel?
– InfiniBand?
• Any and all Fabrics must be redundant
• Use FC exclusively for Storage, but what about other services?
• Use Ethernet and share with other services?
www.rackspace.com
WHY BUILD TWO NETWORKS?
15
www.rackspace.com 16www.rackspace.com
Ethernet
www.rackspace.com 17www.rackspace.com
Fibre
Channel
www.rackspace.com
Storage Networking
18
• Converged Ethernet
– Public
– Private
– Management
– Object Storage
– File Storage
– Block Storage
• One network to maintain
• One set of skills required
• K.I.S.S
www.rackspace.com
Questions?
19
philip.williams@rackspace.co.uk
Thank You
RACKSPACE® | 1 FANATICAL PLACE, CITY OF WINDCREST | SAN ANTONIO, TX 78218
US SALES: 1-800-961-2888 | US SUPPORT: 1-800-961-4454 | WWW.RACKSPACE.COM
RACKSPACE® | © RACKSPACE LTD. | RACKSPACE® AND FANATICAL SUPPORT® ARE SERVICE MARKS OF RACKSPACE US, INC. REGISTERED IN THE UNITED STATES AND OTHER COUNTRIES. | WWW.RACKSPACE.COM

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Storage Infrastructure Choices for OpenStack Clouds

  • 1. Created by: Philip Williams Modified Date: July 2015 OpenStack Day India 2015 Storage Infrastructure Choices for OpenStack Clouds
  • 3. www.rackspace.com Requirements 3 • Durability – How much failure can I experience before data loss? • Availability – How much failure can I experience before data unavailable? – For how long? • Scalability – Capacity Today? Tomorrow? Next Year? – Hot/Cold Ratios •Performance – Realistic expectations apply!
  • 4. www.rackspace.com What exactly are you storing? 4 • Purpose and Value – Mission Critical, cannot run the business? – Second Class Services, just inconvenient? – Dog Pictures? – Computationally expensive to reproduce? – Already Compressed or Encrypted? •Access Patterns – Random, Highly Transactional? – Sequential, Streaming? – Mostly Reads? – Mostly Writes? •Does your data age? – How much of your dataset is “hot” or “cold”?
  • 7. www.rackspace.com Scale-Out Object Storage 7 • Objects replicated between nodes • Proxy Layer for load-balancing • Proven at scale, easy to grow • Can’t mount file systems or block volumes • What if my application doesn’t “speak” Object? • Eventual Consistency
  • 8. www.rackspace.com LVM / iSCSI 8 • Server(s) with local disks carved up by LVM – Disk redundancy built in using RAID or Volume Mirroring • Block Vols presented over Ethernet (iSCSI) • No node failure protection – Server fails, volumes fail • Least Redundancy • Potential for Hot Spots • Lowest Cost* • Easy to Scale
  • 9. www.rackspace.com Dual Controller Storage Arrays 9 • Typically Termed “Mid-Range” ~50-1000 Disks • Block Vols presented via iSCSI and FC Protocols • Controller and Disk Redundancy • Support for aggregated Disk Pools • Support for auto-tiering of data • Snapshot/Clone Capabilities • Typically 5 9’s Availability • Limited Scalability • Good Performance*
  • 10. www.rackspace.com Multi-Controller Storage Arrays 10 • Typically Termed “High End” ~200 to 3000 Disks • Block Vols presented via iSCSI and FC Protocols • Meshed Controller Subsystems • Support for large aggregated disk pools • Support for auto-tiering of data • Snapshot/Clone Capabilities • Redundant Everything – 6 9’s and greater availability • Better Scalability • Higher Performance*
  • 11. www.rackspace.com All Flash Arrays 11 • Block Vols presented via iSCSI and FC Protocols • Controller and Disk Redundancy • Inline Dedupe and Compression • Meshed Controller Subsystems • Snapshot/Clone Capabilities • Typically 5 9’s Availability • Lower Scalability • Highest Performance*
  • 12. www.rackspace.com Scale-Out / Server SAN 12 • Block Vols presented via iSCSI and Proprietary Protocols • Typically Commodity Hardware – x86, 10GbE (sometimes InfiniBand) • Many nodes, 10’s to 100’s • Redundancy achieved by spreading data across nodes – Sub-Object Replication – Erasure Coding • Greatest Scaling • Good Performance*
  • 14. www.rackspace.com Storage Networking 14 • How do I reach my persistently stored data? – Ethernet? – Fibre Channel? – InfiniBand? • Any and all Fabrics must be redundant • Use FC exclusively for Storage, but what about other services? • Use Ethernet and share with other services?
  • 18. www.rackspace.com Storage Networking 18 • Converged Ethernet – Public – Private – Management – Object Storage – File Storage – Block Storage • One network to maintain • One set of skills required • K.I.S.S
  • 20. Thank You RACKSPACE® | 1 FANATICAL PLACE, CITY OF WINDCREST | SAN ANTONIO, TX 78218 US SALES: 1-800-961-2888 | US SUPPORT: 1-800-961-4454 | WWW.RACKSPACE.COM RACKSPACE® | © RACKSPACE LTD. | RACKSPACE® AND FANATICAL SUPPORT® ARE SERVICE MARKS OF RACKSPACE US, INC. REGISTERED IN THE UNITED STATES AND OTHER COUNTRIES. | WWW.RACKSPACE.COM