On Thu, Jun 18, 2020 at 01:25:18PM +0100, Simon Arlott wrote: > On 18/06/2020 08:21, Christoph Hellwig wrote: > > On Wed, Jun 17, 2020 at 07:49:57PM +0100, Simon Arlott wrote: > >> Avoiding a stop of the disk on a reboot is appropriate for HDDs because > >> they're likely to continue to be powered (and should not be told to spin > >> down only to spin up again) but the default behaviour for SSDs should > >> be changed to stop them before the reboot. > > > > I don't think that is true in general. At least for most current server > > class and older desktop and laptop class systems they use the same > > format factors and enclosures, although they are slightly divering now. > > > > So I think this needs to be quirked based on the platform and/or > > enclosure. > > Are you referring to the behaviour for handling HDDs or SSDs? All of the above. > > For HDDs, the default "1" option could mean "automatic" and apply to > rotational disks when power loss is expected. > > For SSDs, I don't think an extra stop should ever be an issue. Extra shutdowns will usually cause additional P/E cycles.
