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Stanford, California, USA
Aug. 21, 2002 to Aug. 23, 2002
ISBN: 0-7695-1650-5
pp: 77
Yitzhak Birk , Technion
Nafea Bishara , Technion
ABSTRACT
A "Storage-Area Network" (SAN) comprises computers ("Initiators"), storage "block devices" ("Targets"), and a Controller(s). Most SANs use the SCSI protocol over various communication infrastructures. Presently, all Initiator - Target traffic must pass through the Controller, severely limiting scalability. We extend the SCSI-3 Transport layer to support distribution, and combine this with SCSI's support for data - control split to create DSDC, a novel architecture that can be used over any networking infrastructure: data may be sent directly between Initiators and Targets, relieving the Controller communication bottleneck; the use of multiple paths for data moreover relieves traffic bottlenecks on network links; finally, passing all commands through the Controller retains simplicity. DSDC thus enables the construction of much larger SANs while retaining the simplicity of a single Controller. A prototype SAN using Ethernet and Linux nodes, with DSDC implemented in the iSCSI transport layer protocol and in the Controller?s SCSI application layer, has been constructed.
INDEX TERMS
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CITATION
Yitzhak Birk, Nafea Bishara, "Distributed-and-Split Data-Control Extension to SCSI for Scalable Storage Area Networks", HOTI, 2002, High-Performance Interconnects, Symposium on, High-Performance Interconnects, Symposium on 2002, pp. 77, doi:10.1109/CONECT.2002.1039260
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