Re: [PATCH] scsi: sd: stop SSD (non-rotational) disks before reboot

[Henrique de Moraes Holschuh]

On Thu, 18 Jun 2020, Christoph Hellwig wrote:
> > For SSDs, I don't think an extra stop should ever be an issue.
> 
> Extra shutdowns will usually cause additional P/E cycles.

I am not so sure.  We're talking about enforcing clean shutdowns here
(from the SSD PoV).

A system reboot takes enough time that the SSD is likely to do about the
same amount of P cycles commiting to FLASH any important data that it
would trigger by a shutdown sequence, simply because it should not keep
important data in RAM for too long.  By extension, it would not increase
E cycles either.

OTOH, unclean shutdowns *always* cause extra P/E, and that's if you're
lucky enough for it to not cause anything much worse.

-- 
  Henrique Holschuh