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CCDP SAN Design Considerations - Study Notes - Part 1

Created on: Jun 12, 2013 4:00 AM by Klaus Engelmann - Last Modified:  Jun 12, 2013 4:10 AM by Klaus Engelmann

SAN Design Considerations - Study Notes - Part 1


Main Concepts


DAS - Direct Attached Storage


NAS - Network Attached Storage (access via NFS, CIFS)


SAN - Storage Area Network (scsi technologies and fibre channel)




HBA - Host Bus Adapter








Cisco Storage Virtualization


- Available logical space for data storage.


- The SAN system handles the process of mappig to an actual physical device.


- MDS 9000 family ==> VSANs capable


- Trunking between VLANs ==> ISL and Enhanced ISL


Inter-VSAN Routing


- IVR is fabric routing


- Sharing of centralized storage services across VSANs


- Fabric Shortest Path First


- Topology database


- Dynamic Incremental SPF


- Associates a cost with each link




- Logical grouping of fabric devices within SAN or VSAN


- Soft Zoning (using DNS) or Hard Zoning (equipment built in).



FICON - Technology


- Fiber connectiviy invented by IBM


- Connects mainframes to SAN


- Cisco supports FICON and FCP (Fibre Channel Protocol).



SANTap - Technology


- Protocol that allows third party storage application to be integrated into the SAN.


- Replicates the data simultanously.


Design Concerns


- Port density.


- Topology


- Oversubscription


- Traffic Management ==> different performance requirements should be handled using techniques


- Fault Isoltation ==> using VSAN


- Convergence and Stability



SAN Design


- Collapse core.


- Dual Fabric collapse core


SAN Extension


- Remote connectivity between different SAN networks using protocols like FCIP and iSCSI.


- FCIP: fiber channel over IP ==> any distance


- iSCSI: SCSI over IP


- Several enhancements: data compression and write acceleration

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