媒體存儲技術(shù)-4存儲基礎(chǔ)iscsi-文庫吧
2025-02-26 18:16 本頁面
【正文】 connected to only one processor (like a DAS). C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future iSCSI HBAs and TCP Offload Engines (TOEs) ?Offloads TCP and, optionally, iSCSI processing into hardware ?Relieves host CPU from: – TCP processing—16bit checksum per packet – iSCSI—optional 32bit header and data digests (CRC32C) TCP Offload iSCSI and TCP Offload File System Block Device SCSI Generic HBA Driver TCP/IP Stack NIC Driver iSCSI Driver TOE Driver SCSI Adapter Adapter Driver TCP/IP Stack iSCSI TCP/IP Stack Applications C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future iSCSI Protocol Stack Data SCSI iSCSI TCP IP Ether PHY Driver TCP IP Ether PHY Driver Data SCSI iSCSI TCP IP Ether PHY Driver Data SCSI iSCSI Adapter Card Host Processing Host Bus Adapter (HBA) Software iSCSI iSCSI TCP Offload Engine (TOE) iSCSI Host Bus Adapter (HBA) C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future iSCSI Performance Consideration C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Example performance impact on CPU util % FC vs. iSCSI TOE vs. iSCSI SW Driver CPU % Throughput MB/s FC HBA iSCSI TOE iSCSI SW Driver 1535MB/s Inflection point determined by system resources (CPU/Memory) ? C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future iSCSI Benefit C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Host Bus Adapter (Fibre Channel) C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Host Bus Adapter (iSCSI) 10/100/1000BaseT PCI C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future MultiTCP Sessions C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future HBA: MultiPath I/O LUN: Logical [Storage] Units COMMUNITCATION UNIVERSITY OF CHINA, STORAGE LABORATORY Is IPSAN similar to NAS? What are the advantages, if any, of IPSAN vs. NAS? C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Performance Analysis: iSCSI vs. NAS(software based – no HBA) iSCSI NFS C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Sequential Read/Write Tests Conclusion: performance in character read/write and block write advantage of iSCSI in block read (2025%) C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future Small Files Read/Write C OMMUNICAITON UNIVERSITY of CHINA STORAGY LABORATORY iSCSI: Past, Present, Future IOGen Test (Emulation of Database) C OMMUNICAITO
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