Re: storage fixup laptop model dependent ?

[Tejun Heo <htejun@gmail.com>]

Hello,

On 12/21/2009 01:34 PM, Tejun Heo wrote:
> (cc'ing Kay and Lennart.  Hello.)
> 
> A proper solution would be....
> 
> * Build database of load cycle limits and useable APM values on drive
>   models.  The former shouldn't be difficult.  Each vendor carries
>   only a few product lines at any given time and publish datasheets on
>   the webpage.  Plus, all the mobile drives I've seen are rated for
>   600,000 cycles.  The latter may be a bit more tricky.  Depending on
>   drive model, certain APM values simply don't work (e.g. 255 means
>   max power by spec but some firmwares wrap the value and recognize it
>   as min power), some values overheats the device and so on.  In most
>   cases the value 254 seems safe tho.  storage-fixup.conf should be
>   useable as the source for useable values, I think.
> 
> * Monitor load cycle count by smart commands and if it continues to
>   increase at an excessive rate (e.g. such that it reduces uptime to
>   under a year), warn the user and configure higher APM value.
> 
> As this problem mostly happens on laptops, I think it's probably best
> to handle this from the new desktop disk management thing so that the
> user can be warned.  Do you think it's feasible to handle this from
> devkit?

Lennart, any thought on this?

Thanks.

-- 
tejun