SMART attributes for SSD (was: SSDD reliability)

On 05/05/11 22:50, David Boreham wrote:
> On 5/4/2011 11:50 PM, Toby Corkindale wrote:
>>
>> In what way has the SMART read failed?
>> (I get the relevant values out successfully myself, and have Munin
>> graph them.)

> Mis-parse :) It was my _attempts_ to read SMART that failed.
> Specifically, I was able to read a table of numbers from the drive, but
> none of the numbers looked particularly useful or likely to be a "time
> to live" number. Similar to traditional drives, where you get this table
> of numbers that are either zero or random, that you look at saying
> "Huh?", all of which are flagged as "failing". Perhaps I'm using the
> wrong SMART groking tools ?

I run:
sudo smartctl -a /dev/sda

And amongst the usual values, I also get:
232 Available_Reservd_Space 0x0002 100 048 000 Old_age Always
- 9011683733561
233 Media_Wearout_Indicator 0x0002 100 000 000 Old_age Always
- 0

The media wearout indicator is the useful one.

Plus some unknown attributes:
229 Unknown_Attribute 0x0002 100 000 000 Old_age Always
- 21941823264152
234 Unknown_Attribute 0x0002 100 000 000 Old_age Always
- 953583437830
235 Unknown_Attribute 0x0002 100 000 000 Old_age Always
- 1476591679

I found some suggested definitions for those attributes, but they didn't
seem to match up with my values once I decoded them, so mine must be
proprietary.

-Toby