Disk initiated asynchronous event notification in an information handling system

An information handling system having serial attached SCSI (SAS) target initiated asynchronous event notification (AEN), said system comprising:

• a serial attached SCSI (SAS) host controller;
• a SAS target, wherein the SAS target is coupled to the SAS host controller with a SAS physical link;
• wherein the SAS target determines arrival of an asynchronous event notification (AEN) and whether a command from the SAS host controller is pending to the SAS target;
• wherein
• if the SAS host controller command is pending to the SAS target, then the SAS host controller checks the AEN of the SAS target, and
• if the SAS host controller command is not pending to the SAS target, then an AEN timer is started if not already running;
• wherein when the running AEN timer expires and if the AEN is still pending then the SAS target sends an out-of-band message sequence to the SAS host controller.

An information handling system having serial attached SCSI (SAS) target initiated asynchronous event notification (AEN), said system comprising:

• a serial attached SCSI (SAS) redundant array of independent disks (RAID) controller;
• at least one SAS hard disk drive, wherein the at least one SAS hard disk drive is coupled to the SAS RAID controller;
• wherein the at least one SAS hard disk drive determines arrival of an asynchronous event notification (AEN) and whether a command from the SAS RAID controller is pending to the at least one SAS hard disk drive;
• wherein
• if the SAS RAID controller command is pending to the at least one SAS hard disk drive, then the SAS RAID controller checks the AEN of the at least one SAS hard disk drive, and
• if the SAS RAID controller command is not pending to the at least one SAS hard disk drive, then an AEN timer is started if not already running;
• wherein when the running AEN timer expires and if the AEN is still pending then the at least one SAS hard disk drive sends an out-of-band message sequence to the SAS RAID controller.