Re: 'Device not ready' issue on mpt2sas since 3.1.10

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On 07/09/2012 08:21 PM, Matthias Prager wrote:
>
> I haven't checked the scsi logging side, but about the only commands
> that wake up the disks are 'smartctl -a /dev/sda' and 'sg_start'
> (smartcl maybe issuing a START UNIT command on it's own).

smartctl -a does appear to wake the disks.  The scsi log shows an
IDENTIFY and then several ATA passthrough commands (one of which takes
~10 seconds to complete).  So, I don't see an explicit START UNIT, but
one of those ATA commands which I didn't decode could certainly trigger
the wakeup.

-- Rob
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