> The Start Stop Unit (SSU) command takes in the order of a second to
> complete on some SAS SSDs and longer on hard disks. Synchronize Cache
> (SC) can also take some time. Both commands have an IMMED bit in their
> cdbs for those apps that don't want to wait. This patch introduces a
> long delay for those commands when the IMMED bit is clear. Since SC
> is a media access command then when the fake_rw option is active, its
> cdb processing is skipped and it returns immediately. The SSU command
> is not altered by the setting of the fake_rw option. These actions are
> not changed by this patch.
Applied to 4.17/scsi-queue. Thank you!
Martin K. Petersen Oracle Linux Engineering