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CCDP SAN Design Considerations - Study Notes - Part 1

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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)

 

Fabric

 

HBA - Host Bus Adapter

 

Initiator

 

Zone

 

VSAN

 

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

 

Zoning

 

- 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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