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In context of a host controller (HBA/RAID card) which sends IO traffic to SAS/SATA drives which are part of logical volume - so in such setup, generally I hear a term "Outstanding commands". I did got somewhat understanding that these are number of IO requests which a controller can accept even if it already has some pending IOs which are not completed yet. So two questions here,

1) What would be a more complete (or more comprehensive) definition for outstanding IO commands ?

2) What is generic behavior of host controller when more IO commands arrives which is larger than its queue depth for holding outstanding commands ?

3) How non NCQ commands handled in such design ? Is it possible that in case of SATA drives where we have NCQ concept, a non NCQ command can starve for arbitrary amount of time ?

Pravar Jawalekar
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I/O request packets used for communications between the device drivers and the operating system. It allows a particular process to get unblocked and for entirely executed

Andrew Hunt
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