| 摘要 |
An SAS RAID adapter comprises an input-output processor (IOP) and at least two SAS input-output controllers (IOCs). Wherein SAS links coupled to each of the IOCs form "virtual ports" in order to increase performance and maintain availability. The virtual ports across the at least two IOCs have wide port SAS link capability so as to provide performance enhancements similar to a standard SAS wide port. Even if a single IOC failure occurs, downshifting to N/2 links is provided with degraded aggregated bandwidth (data throughput) instead of a failover and/or system shutdown.
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