Proposed Storage Area Network Facilities For Discussion.
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Transcript of Proposed Storage Area Network Facilities For Discussion.
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Proposed Storage Area Network Facilities
For Discussion
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Motivation
University investing SRIF funds in SAN technology to help support future e-science projects
Other University’s doing the same e.g EdinburghOpportunity to review University’s overall storage requirements
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On Campus most disk storage is provided via Direct Attack Storage (DAS)
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Problems with DAS
File store growth exponential leading to:Proliferation of hardwareSub-optimal provisionInefficient delivery
Close coupling leads to single points of failureBackup regimes become stressed, costly and labour intensiveDisaster recovery procedures become expensive or impractical
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Discussion
It is proposed that a storage consolidation strategy based on Storage Area Network (SAN) technology would provide a flexible, manageable and cost effective solution for the majority of the University’s file store requirements
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Storage Consolidation
Storage consolidation is about centralising and sharing storage resources amongst a variety of file and application servers The management of storage resources is separated from the management of servers by establishing a network that removes the physical mapping of storage devices to physical serversThis network allows isolated islands of storage to be pooled together and allocated to servers in a more flexible fashion
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Storage Consolidation BenefitsHeterogeneous environmentProtects against SPFStorage aggregation into virtual poolsLess complex managementLower admin costsMore suited to DRPotential for server consolidationSignificantly improves backup restore capabilitiesImproves data security, accessibility and availability
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Storage Consolidation Architectures
Enterprise RAID operates at Block level Storage Area Network (SAN) operates at Block levelNetwork Attached Storage (NAS) operates at File level
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Enterprise RAID
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Storage Area Network (SAN)
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Network Attached Storage (NAS)
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Future TrendsIntegrate the benefits of different architectures into a common model by enhancing the SAN architecture with NAS head functionality and Fabric extension capabilitiesNAS heads provide:
SAN attached dedicated serversResilience through ClusteringHigh performance interfaces
Fabric extension via iSCSI, FC/IP and iFCIP provideIntegration of SAN islandsLower cost server to SAN connectionsAbility to extend SAN connectivity
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Bringing it together
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Potential SAN Benefits for the University
More efficient use of storage resourcesLess systems administration effortResilience via fault toleranceDisaster recovery plansBackup and restore operationsServer consolidation and resilienceCore service provision – Directories, E-Mail, CSCE, SSD, Samba etcResearch projectsFaculty/Department Block and File level requirements
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Proposed SAN ModelA core fabric spanning 2 sitesA number of FC edge switches linked to the FC coreA number of disk arrays providing the storage requirements for:
Research projectsMirroringCore servicesOther applications
A number of servers connected via FC Host Bus Adaptors (HBAs) An enterprise class backup facility NAS heads for file sharing functionalityiSCSI support for fabric extension to non FC attached clientsFC/IP support for native fabric extension
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Proposed SAN Model
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What factors need to be addressed when considering a SAN solution?
Fabric costsFabric Design
Switch costsHBA costsFibre provisionManufacturers limits
Vendor and OS support
Fabric extensionNAS headsiSCSI and FC/IP
SAN managementDisk groupingSecurityPerformance monitoring
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What factors need to be addressed when considering a SAN solution?
Disk virtualisation requirementsVirtualising file systemsBackup Regimes
Type – Snapshot, Full and IncrementalExtent – wont be able to backup all SAN storageMedia – Tape, staging disk then tapeCosts – hardware and media
Fabric Connection Guidelines
Not an open SANRestrict to manageable set of proven hardware compatible systems
FundingInitial SRIFRequires significant investment over timeWho pays?
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Alternative SolutionsLower cost IP/SAN solutions emerging based on
Standard hardwareOpen source OS’s iSCSI over existing campus networks
ExamplesOpen source NAS with future SAN support http://www.techworld.com/news/index.cfm?fuseaction=displaynews&NewsID=615 Open source NAS appliance http://www.nwfusion.com/reviews/2003/0428nasrev2.html SANmelody - http://www.datacore.com/products/prod_SANmelody.asp