Re: [PATCH 1/3] sd: don't bother spinning up disks on resume

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On 11/7/2013 1:21 PM, Douglas Gilbert wrote:
> On 13-11-06 08:57 PM, Phillip Susi wrote:
>> Don't bother forcing disks to spin up on resume, as they will do
>> so automatically when accessed, and forcing them to spin up slows
>> down the resume.  Add a second bit to the manage_start_stop flag
>> to restore the previous behavior.
> 
> SCSI disks when in STOP state do not spin up "automatically when
> accessed".

The drive does not, but the scsi error handling notices when a command
fails because the drive needs started, starts it, and retries the command.

> And your choice of bits looks like it will favour fixing broken
> SATA behaviour but as a by-product break working SCSI disk
> behaviour.

No, it has nothing to do with sata behavior; it has to do with whether
or not all disk drives should be restarted immediately after a resume,
or only when they are accessed.  I happen to have a few older drives
that I very rarely access and would rather they not start up every
time I resume.


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