Re: [PATCH 5/6] scsi: core: don't limit per-LUN queue depth for SSD when HBA needs

Martin K. Petersen
2020-01-24T01:59:31Z

Sumanesh,

> The high-end controllers might expose a SCSI interface, but can have
> all kind of devices (NVMe/SCSI/SATA) behind it, and has its own
> capability to queue IO and feed to devices as needed. Those devices
> should not be penalized with the overhead of the device_busy counter,
> just because they chose to expose themselves has SCSI devices (for
> historical and backward compatibility reasons).

Please read what I proposed. megaraid VDs don't report QUEUE_FULL so you
would not trigger the device_busy counter.

--
Martin K. Petersen Oracle Linux Engineering