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Methods and structure for supporting persistent reservations in a multiple-path storage environment

  • US 7,313,636 B2
  • Filed: 06/15/2004
  • Issued: 12/25/2007
  • Est. Priority Date: 06/15/2004
  • Status: Active Grant
First Claim
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1. A system comprising:

  • at least one host system wherein each host system has multiple SCSI-3 I/O adapters serving as SCSI-3 initiators for coupling the corresponding host system to a storage system and wherein the multiple SCSI-3 I/O adapters define multiple physical paths between the corresponding host system and a storage system;

    at least one process operable on each of said at least one host system wherein each process is adapted to generate a host system request to exchange information with a storage system and wherein the generated host system requests use virtual path information representing any of the multiple physical paths between the corresponding host system and a storage system without indicating a specific physical path of the multiple physical paths; and

    a multiple-path driver element configured within each of said at least one host system and coupled to each said process to map virtual path information into physical path information for a selected physical path of the multiple physical paths and wherein the multiple-path driver is further adapted to transparently coordinate SCSI-3 Persistent Reservation operations by all processes operable on all host systems of the system.

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