Parallel SCSI host adapter and method for fast capture of shadow state data
US6801975B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | Oct 5, 2004 |
| Priority date | — |
| Expiry date | Apr 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F2213/0036
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A parallel SCSI host adapter includes a SCSI bus port and a host I/O bus port. The parallel SCSI host adapter takes a snapshot of state data for a first data channel coupling the SCSI bus port to the host I/O bus port following receipt of a complete Packetized SCSI protocol information unit having a context from the SCSI bus port. Following the snapshot, another Packetized SCSI protocol information unit for the same context is transferred over the first data channel. Since the snapshot requires substantially no time delay relative to a time delay associated with saving the state data in a hardware I/O command block for the context, latency between the information units for the same context is minimized in the parallel SCSI host adapter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.