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Future technologies for storage networks
Shravan PargalDirector, Compellent Consulting
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Agenda• Storage applications• Application requirements• Available technology solutions• Who is winning today?• What will determine the winning storage
technology of tomorrow?
And, NO object storage in this talk!
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Storage applications• Data base applications
• What are they used for in a business?
• Email• Is it critical to a business?
• File and print sharing• Document archiving• “Backup”
Audience question – what % of storage today is email storage?
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Application categories• Business processing:
• Enterprise resource planning (ERP)
• Customer relationship management (CRM)
• Online transaction processing (OLTP)
• Batch • Decision support:
• Data warehousing/data mart
• Data analysis/data mining
• Collaborative: • Email • Workgroup
• Application development • IT infrastructure:
• File and print • Networking • Proxy caching • Security • Systems management
• Web infrastructure: • Web serving • Streaming media
• Technical -Scientific/engineering (compute only)
Source IDC: 2002
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Storage market
Source IDC: 2002
Technical3%
Other3%
Business Processing
25%
IT Infrastructure
24%
Decision support
19%
Application development
10%
Collaborative10%
Web Infrastructure
6%
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Application requirements
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Application requirements…
• Focus of Databases• What is the end user application?
• Order entry• Data mining• OLTP
• All require efficient block I/O• Benchmarked using transactions per
second
Requirements depend on the type of data in the database and the method of
access.
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…More requirements• Latency
• How long are you willing to wait at the ATM machine?
• Availability• What happens if the ATM is unable to connect to
its database?• What happens if a patient’s allergy record is
unavailable during surgery?
• Scalability• How much storage do you have today, and how
much will it be in 3 or 6 months?• Does the existing storage solution scale?
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FinallyDoes the user or administrator of the
application know the answer to the following:
• What is the data throughput required? • MB/s
• How important are transactions per second metrics? • Input/Outputs per second
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Storage architectureoptions
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Architecture Options• Networked Storage – NAS and SAN
• NAS• Very flexible on front end protocol options (FC, iSCSI, InfiniBand
available today)• Currently only FC on the backend
• SAN• FC• IP
» iSCSI» iFCP» FCIP
• InfiniBand
• Direct attached storage• SCSI• ATA
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Technology Options• Storage Virtualization
• In-band• Out-of-band
• Why is this interesting?• Why is it difficult to do?• What are the problems with storage
virtualization?
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Network Attached Storage (NAS)
NAS Filer
Application Server
Clients
EthernetLAN
Storage Server
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Storage Area Network (SAN)
Servers StorageClients
Fibre ChannelSAN
Win 2K
Unix
Novell
Tape
Disk
Disk
EthernetLAN
Disk
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iSCSI, iFCP and FCIP Protocol Stacks
IP IP IP
TCP TCP
New Serial SCSI FCP FC-4
TCP
FC Lower Layers
FCP FC-4
iSCSI iFCP FCIP
Standard SCSI Command Set
Operating System
Applications
Copyright © 2001, Storage Networking Industry Association
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Direct attached drives (DAS)
IDE or SCSI
Internal disk drive(s)
Useful link: http://www.pcmech.com/hdindex.htm
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Who is winning today• Direct Attached Storage - 66.4 % of all
installed storage in 2001
• Network Attached Storage – 7.4 % of all installed storage in 2001
• Storage Area Networks – 26.1 % of all installed storage in 2001
Source IDC: 2002
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Installed Storage Revenue
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Installed Storage Data
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Storage Consolidation
LAN
NTServers
Tape Drive
RAID
Tape Drive
RAID
Tape Drive
RAID
NTServers
RAID(Email)
TapeLibrary
Mission-Critical RAID(Oracle, ERP DB)
SAN
Switch Switch
SwitchSwitch
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Interconnect Technologies
Knowing that the strengths of a technology don’t guarantee its success, here are some nice technologies …
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Fibre Channel• Low Latency• Immunity from congestion• In-order delivery• Guaranteed delivery• 2 Gigabit per second pipe• Dominant server to storage connection
What percentage of the 2 Gb/s bandwidth is used?
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IP• TCP provides in-order delivery• Most ethernet switches can now provide
some level of immunity from congestion –particularly in a LAN environment
• Higher layer protocols provide delivery guarantees
• 1 Gigabit per second bandwidth• Dominant client to server connection
What percentage of the bandwidth is used?
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Reality check for IP Storage• Fibre Channel
• Will not disappear any time soon• Market will continue to grow and expand
• IP will provide a way to connect FC islands• Today with FCIP, iFCP and iSCSI
• iSCSI is slowly maturing• Plug Fests to test standard compliance• Final specification just completed - February 2003
iSCSI provides end-to-end native IP Storage
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Future Network
Servers StorageClients
SAN
Win 2K
Unix
Novell
Tape
Disk
Disk
LAN
Disk
Single management domain
There is a convergence of network and data administration functions
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Trumps
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Hidden agendas• Who is backing the technology?
• FC – FC switch and adapter incumbents• Brocade, EMC, Emulex, QLogic, HDS, IBM,
Sun, HP• iFCP – Nishan and others• FCIP – Cisco, Brocade and others• iSCSI – Cisco, IBM, EMC and others
Fibre Channel incumbents stand to lose as new IP based technologies gain acceptance
The new players need IP based technologies to enter the storage space
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Tomorrow’s winners
• What is going to decide who the winners are?• Open systems compliant• Resilient• Flexible deployment options• Affordable as the solution scales• Enables server consolidation
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Conclusions• Better
• More features – what is the baseline feature-set requirement?
• Faster• More IOPs - Not more MB/s
• Cheaper• Commodity pricing – like ethernet
• Easy to use – Simplify!
The best technologies don’t always triumph over other contenders – remember VHS v.s.
Betamax
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Questions?
Shravan Pargal
Director, Compellent ConsultingCompellent Technologies Inc.
www.compellent.com